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701 lines
21 KiB
701 lines
21 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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Additional permissions under GNU GPL version 3 section 7 |
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If you modify this Program, or any covered work, by linking or |
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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK, |
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NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent |
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JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK |
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(or a modified version of those libraries), |
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containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA, |
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PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG |
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JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the |
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licensors of this Program grant you additional |
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permission to convey the resulting work. Corresponding Source for a |
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non-source form of such a combination shall include the source code for |
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the parts of OpenSSL and IJG JPEG Library used as well as that of the covered |
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work. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#include "hsTypes.h" |
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#include "hsGeometry3.h" |
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#include "plClosest.h" |
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#include "hsFastMath.h" |
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static const hsScalar kRealSmall = 1.e-5f; |
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// Find the closest point on a line (or segment) to a point. |
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UInt32 plClosest::PointOnLine(const hsPoint3& p0, |
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const hsPoint3& p1, const hsVector3& v1, |
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hsPoint3& cp, |
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UInt32 clamp) |
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{ |
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hsScalar invV1Sq = v1.MagnitudeSquared(); |
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// v1 is also zero length. The two input points are the only options for output. |
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if( invV1Sq < kRealSmall ) |
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{ |
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cp = p1; |
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return kClamp; |
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} |
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hsScalar t = v1.InnerProduct(p0 - p1) / invV1Sq; |
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cp = p1; |
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// clamp to the ends of segment v1. |
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if( (clamp & kClampLower1) && (t < 0) ) |
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{ |
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return kClampLower1; |
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} |
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if( (clamp & kClampUpper1) && (t > 1.f) ) |
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{ |
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cp += v1; |
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return kClampUpper1; |
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} |
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cp += v1 * t; |
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return 0; |
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} |
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// Find closest points to each other from two lines (or segments). |
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UInt32 plClosest::PointsOnLines(const hsPoint3& p0, const hsVector3& v0, |
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const hsPoint3& p1, const hsVector3& v1, |
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hsPoint3& cp0, hsPoint3& cp1, |
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UInt32 clamp) |
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{ |
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hsScalar invV0Sq = v0.MagnitudeSquared(); |
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// First handle degenerate cases. |
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// v0 is zero length. Resolves to finding closest point on p1+v1 to p0 |
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if( invV0Sq < kRealSmall ) |
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{ |
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cp0 = p0; |
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return kClamp0 | PointOnLine(p0, p1, v1, cp1, clamp); |
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} |
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invV0Sq = 1.f / invV0Sq; |
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// The real thing here, two non-zero length segments. (v1 can |
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// be zero length, it doesn't affect the math like |v0|=0 does, |
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// so we don't even bother to check. Only means maybe doing extra |
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// work, since we're using segment-segment math when all we really |
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// need is point-segment.) |
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// The parameterized points for along each of the segments are |
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// P(t0) = p0 + v0*t0 |
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// P(t1) = p1 + v1*t1 |
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// |
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// The closest point on p0+v0 to P(t1) is: |
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// cp0 = p0 + ((P(t1) - p0) dot v0) * v0 / ||v0|| ||x|| is mag squared here |
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// cp0 = p0 + v0*t0 => t0 = ((P(t1) - p0) dot v0 ) / ||v0|| |
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// t0 = ((p1 + v1*t1 - p0) dot v0) / ||v0|| |
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// |
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// The distance squared from P(t1) to cp0 is: |
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// (cp0 - P(t1)) dot (cp0 - P(t1)) |
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// |
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// This expands out to: |
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// |
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// CV0 dot CV0 + 2 CV0 dot DV0 * t1 + (DV0 dot DV0) * t1^2 |
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// |
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// where |
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// |
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// CV0 = p0 - p1 + ((p1 - p0) dot v0) / ||v0||) * v0 == vector from p1 to closest point on p0+v0 |
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// and |
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// DV0 = ((v1 dot v0) / ||v0||) * v0 - v1 == ortho divergence vector of v1 from v0 negated. |
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// |
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// Taking the first derivative to find the local minimum of the function gives |
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// |
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// t1 = - (CV0 dot DV0) / (DV0 dot DV0) |
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// and |
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// t0 = ((p1 - v1 * t1 - p0) dot v0) / ||v0|| |
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// |
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// which seems kind of obvious in retrospect. |
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hsVector3 p0subp1(&p0, &p1); |
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hsVector3 CV0 = p0subp1; |
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CV0 += v0 * p0subp1.InnerProduct(v0) * -invV0Sq; |
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hsVector3 DV0 = v0 * (v1.InnerProduct(v0) * invV0Sq) - v1; |
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// Check for the vectors v0 and v1 being parallel, in which case |
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// following the lines won't get us to any closer point. |
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hsScalar DV0dotDV0 = DV0.InnerProduct(DV0); |
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if( DV0dotDV0 < kRealSmall ) |
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{ |
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// If neither is clamped, return any two corresponding points. |
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// If one is clamped, return closest points in its clamp range. |
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// If both are clamped, well, both are clamped. The distance between |
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// points will no longer be the distance between lines. |
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// In any case, the distance between the points should be correct. |
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UInt32 clamp1 = PointOnLine(p0, p1, v1, cp1, clamp); |
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UInt32 clamp0 = PointOnLine(cp1, p0, v0, cp0, clamp >> 1); |
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return clamp1 | (clamp0 << 1); |
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} |
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UInt32 retVal = 0; |
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hsScalar t1 = - (CV0.InnerProduct(DV0)) / DV0dotDV0; |
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if( (clamp & kClampLower1) && (t1 <= 0) ) |
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{ |
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t1 = 0; |
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retVal |= kClampLower1; |
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} |
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else if( (clamp & kClampUpper1) && (t1 >= 1.f) ) |
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{ |
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t1 = 1.f; |
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retVal |= kClampUpper1; |
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} |
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hsScalar t0 = v0.InnerProduct(p0subp1 - v1 * t1) * -invV0Sq; |
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cp0 = p0; |
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if( (clamp & kClampUpper0) && (t0 >= 1.f) ) |
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{ |
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cp0 += v0; |
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retVal |= kClampUpper0; |
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} |
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else if( !(clamp & kClampLower0) || (t0 > 0) ) |
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{ |
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cp0 += v0 * t0; |
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} |
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else |
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{ |
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retVal |= kClampLower0; |
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} |
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// If we clamped t0, we need to recalc t1 because the original |
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// calculation of t1 was based on an infinite p0+v0. |
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if( retVal & kClamp0 ) |
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{ |
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t1 = v1.InnerProduct(cp0 - p1) / v1.MagnitudeSquared(); |
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retVal &= ~kClamp1; |
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if( (clamp & kClampLower1) && (t1 <= 0) ) |
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{ |
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t1 = 0; |
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retVal |= kClampLower1; |
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} |
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else if( (clamp & kClampUpper1) && (t1 >= 1.f) ) |
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{ |
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t1 = 1.f; |
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retVal |= kClampUpper1; |
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} |
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} |
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cp1 = p1; |
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cp1 += v1 * t1; |
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return retVal;; |
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} |
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hsBool plClosest::PointOnSphere(const hsPoint3& p0, |
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const hsPoint3& center, hsScalar rad, |
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hsPoint3& cp) |
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{ |
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hsVector3 del(&p0, ¢er); |
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hsScalar dist = hsFastMath::InvSqrtAppr(del.MagnitudeSquared()); |
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dist *= rad; |
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del *= dist; |
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cp = center; |
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cp += del; |
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return dist <= 1.f; |
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} |
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hsBool plClosest::PointOnBox(const hsPoint3& p0, |
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const hsPoint3& corner, |
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const hsVector3& axis0, |
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const hsVector3& axis1, |
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const hsVector3& axis2, |
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hsPoint3& cp) |
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{ |
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UInt32 clamps = 0; |
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hsPoint3 currPt = corner; |
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clamps |= PointOnLine(p0, currPt, axis0, cp, kClamp); |
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currPt = cp; |
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clamps |= PointOnLine(p0, currPt, axis1, cp, kClamp); |
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currPt = cp; |
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clamps |= PointOnLine(p0, currPt, axis2, cp, kClamp); |
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return !clamps; |
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} |
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hsBool plClosest::PointOnSphere(const hsPoint3& p0, const hsVector3& v0, |
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const hsPoint3& center, hsScalar rad, |
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hsPoint3& cp, |
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UInt32 clamp) |
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{ |
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// Does the line hit the sphere? If it does, we return the entry point in cp, |
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// otherwise we find the closest point on the sphere to the line. |
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/* |
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((p0 + v0*t) - center)^2 = rad |
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v0*v0 * t*t + 2 * v0*t * (p0-c) + (p0-c)^2 - rad = 0 |
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t = (-2 * v0*(p0-c) +- sqrt(4 * (v0*(p0-c))^2 - 4 * v0*v0 * ((p0-c)^2 - rad) / 2 * v0 * v0 |
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t = (-v0*(p0-c) +- sqrt((v0*(p0-c))^2 - v0*v0 * ((p0-c)^2 - rad) / v0 * v0 |
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So, line hits the sphere if |
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(v0*(p0-c))^2 > v0*v0 * ((p0-c)^2 - rad) |
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If clamped, need additional checks on t before returning true |
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If line doesn't hit the sphere, we find the closest point on the line |
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to the center of the sphere, and return the intersection of the segment |
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connecting that point and the center with the sphere. |
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*/ |
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hsScalar termA = v0.InnerProduct(v0); |
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if( termA < kRealSmall ) |
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{ |
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return PointOnSphere(p0, center, rad, cp); |
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} |
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hsVector3 p0Subc(&p0, ¢er); |
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hsScalar termB = v0.InnerProduct(p0Subc); |
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hsScalar termC = p0Subc.InnerProduct(p0Subc) - rad; |
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hsScalar disc = termB * termB - 4 * termA * termC; |
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if( disc >= 0 ) |
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{ |
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disc = hsSquareRoot(disc); |
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hsScalar t = (-termB - disc) / (2.f * termA); |
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if( (t < 0) && (clamp & kClampLower0) ) |
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{ |
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hsScalar tOut = (-termB + disc) / (2.f * termA); |
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if( tOut < 0 ) |
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{ |
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// Both isects are before beginning of clamped line. |
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cp = p0; |
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cp += v0 * tOut; |
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return false; |
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} |
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if( (tOut > 1.f) && (clamp & kClampUpper0) ) |
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{ |
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// The segment is entirely within the sphere. Take the closer end. |
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if( -t < tOut - 1.f ) |
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{ |
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cp = p0; |
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cp += v0 * t; |
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} |
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else |
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{ |
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cp = p0; |
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cp += v0 * tOut; |
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} |
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return true; |
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} |
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// We pierce the sphere from inside. |
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cp = p0; |
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cp += v0 * tOut; |
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return true; |
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} |
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cp = p0; |
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cp += v0 * t; |
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if( (t > 1.f) && (clamp & kClampUpper0) ) |
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{ |
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return false; |
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} |
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return true; |
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} |
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// Okay, missed the sphere, find closest point. |
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hsPoint3 lp; |
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PointOnLine(center, p0, v0, lp, clamp); |
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PointOnSphere(lp, center, rad, cp); |
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return false; |
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} |
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hsBool plClosest::PointOnBox(const hsPoint3& p0, const hsVector3& v0, |
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const hsPoint3& corner, |
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const hsVector3& axis0, |
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const hsVector3& axis1, |
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const hsVector3& axis2, |
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hsPoint3& cp, |
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UInt32 clamp) |
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{ |
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UInt32 clampRes = 0; |
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hsPoint3 cp0, cp1; |
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hsPoint3 currPt = corner; |
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clampRes |= PointsOnLines(p0, v0, currPt, axis0, cp0, cp1, clamp); |
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currPt = cp1; |
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clampRes |= PointsOnLines(p0, v0, currPt, axis1, cp0, cp1, clamp); |
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currPt = cp1; |
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clampRes |= PointsOnLines(p0, v0, currPt, axis2, cp0, cp1, clamp); |
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currPt = cp1; |
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return !clampRes; |
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} |
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hsBool plClosest::PointOnPlane(const hsPoint3& p0, |
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const hsPoint3& pPln, const hsVector3& n, |
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hsPoint3& cp) |
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{ |
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/* |
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p' = p - ((p-pPln)*n)/|n| * n/|n| |
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p' = p + ((pPln-p)*n) * n / |n|^2 |
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*/ |
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hsScalar invNLen = hsFastMath::InvSqrt(n.MagnitudeSquared()); |
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hsScalar nDotp = n.InnerProduct(pPln - p0); |
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cp = p0 + n * (nDotp * invNLen); |
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return nDotp >= 0; |
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} |
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hsBool plClosest::PointOnPlane(const hsPoint3& p0, const hsVector3& v0, |
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const hsPoint3& pPln, const hsVector3& n, |
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hsPoint3& cp, |
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UInt32 clamp) |
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{ |
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/* |
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p0 + v0*t is on plane, i.e. |
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(p0 + v0*t) * n = pPln * n |
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p0 * n + v0 * n * t = pPln * n |
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v0 * n * t = (pPln - p0) * n |
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t = (pPln - p0) * n / (v0 * n) |
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Then clamp appropriately, garnish, and serve with wild rice. |
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*/ |
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hsBool retVal = true; |
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hsScalar pDotn = n.InnerProduct(pPln - p0); |
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hsScalar v0Dotn = n.InnerProduct(v0); |
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if( (v0Dotn < -kRealSmall) || (v0Dotn > kRealSmall) ) |
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{ |
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hsScalar t = pDotn / v0Dotn; |
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if( (clamp & kClampLower) && (t < 0) ) |
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{ |
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t = 0; |
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retVal = false; |
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} |
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else if( (clamp & kClampUpper) && (t > 1.f) ) |
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{ |
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t = 1.f; |
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retVal = false; |
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} |
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cp = p0; |
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cp += v0 * t; |
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} |
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else |
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{ |
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cp = p0 + v0 * 0.5f; |
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retVal = (pDotn > -kRealSmall) && (pDotn < kRealSmall); |
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} |
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return retVal; |
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} |
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hsBool plClosest::PointBetweenBoxes(const hsPoint3& aCorner, |
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const hsVector3& aAxis0, |
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const hsVector3& aAxis1, |
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const hsVector3& aAxis2, |
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const hsPoint3& bCorner, |
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const hsVector3& bAxis0, |
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const hsVector3& bAxis1, |
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const hsVector3& bAxis2, |
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hsPoint3& cp0, hsPoint3& cp1) |
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{ |
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const hsVector3* aAxes[3] = { &aAxis0, &aAxis1, &aAxis2 }; |
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const hsVector3* bAxes[3] = { &bAxis0, &bAxis1, &bAxis2 }; |
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return PointBetweenBoxes(aCorner, aAxes, bCorner, bAxes, cp0, cp1); |
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} |
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#if 0 // TRASH THIS |
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hsBool plClosest::PointBetweenBoxes(const hsPoint3& aCorner, |
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const hsVector3* aAxes[3], |
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const hsPoint3& bCorner, |
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const hsVector3* bAxes[3], |
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hsPoint3& cp0, hsPoint3& cp1) |
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{ |
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hsPoint3 aCurrPt = aCorner; |
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hsPoint3 bCurrPt = bCorner; |
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hsPoint3 bStartPt[3]; |
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bStartPt[0] = bStartPt[1] = bStartPt[2] = bCorner; |
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hsBool retVal = true; |
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int i, j; |
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for( i = 0; i < 3; i++ ) |
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{ |
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hsPoint3 aBestPt; |
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hsPoint3 bBestPt; |
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hsScalar minDistSq = 1.e33f; |
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for( j = 0; j < 3; j++ ) |
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{ |
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hsPoint3 aNextPt, bNextPt; |
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PointsOnLines(aCurrPt, *aAxes[i], |
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bStartPt[j], *bAxes[j], |
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aNextPt, bNextPt, |
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plClosest::kClamp); |
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hsScalar distSq = hsVector3(&aNextPt, &bNextPt).MagnitudeSquared(); |
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if( distSq < minDistSq ) |
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{ |
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aBestPt = aNextPt; |
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bBestPt = bNextPt; |
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if( distSq < kRealSmall ) |
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retVal = true; |
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minDistSq = distSq; |
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} |
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hsVector3 bMove(&bNextPt, &bStartPt[j]); |
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int k; |
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for( k = 0; k < 3; k++ ) |
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{ |
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if( k != j ) |
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bStartPt[k] += bMove; |
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} |
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} |
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aCurrPt = aBestPt; |
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bCurrPt = bBestPt; |
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} |
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cp0 = aCurrPt; |
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cp1 = bCurrPt; |
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return retVal; |
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} |
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#elif 0 // TRASH THIS |
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hsBool plClosest::PointBetweenBoxes(const hsPoint3& aCorner, |
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const hsVector3* aAxes[3], |
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const hsPoint3& bCorner, |
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const hsVector3* bAxes[3], |
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hsPoint3& cp0, hsPoint3& cp1) |
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{ |
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/* |
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Six combinations to try to go through every possible |
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combination of axes from A and B |
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00 00 01 01 02 02 |
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11 12 12 10 10 11 |
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22 21 20 22 21 20 |
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*/ |
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int bIdx0 = 0; |
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int bIdx1 = 1; |
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int bIdx2 = 2; |
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hsPoint3 aBestPt, bBestPt; |
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hsScalar minDistSq = 1.e33f; |
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hsBool retVal = false; |
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int i; |
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for( i = 0; i < 6; i++ ) |
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{ |
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hsPoint3 aCurrPt = aCorner; |
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hsPoint3 bCurrPt = bCorner; |
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hsPoint3 aNextPt, bNextPt; |
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PointsOnLines(aCurrPt, *aAxes[0], |
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bCurrPt, *bAxes[bIdx0], |
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aNextPt, bNextPt, |
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plClosest::kClamp); |
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aCurrPt = aNextPt; |
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bCurrPt = bNextPt; |
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PointsOnLines(aCurrPt, *aAxes[1], |
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bCurrPt, *bAxes[bIdx1], |
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aNextPt, bNextPt, |
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plClosest::kClamp); |
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aCurrPt = aNextPt; |
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bCurrPt = bNextPt; |
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PointsOnLines(aCurrPt, *aAxes[2], |
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bCurrPt, *bAxes[bIdx2], |
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aNextPt, bNextPt, |
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plClosest::kClamp); |
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hsScalar distSq = hsVector3(&aNextPt, &bNextPt).MagnitudeSquared(); |
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if( distSq < minDistSq ) |
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{ |
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aBestPt = aNextPt; |
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bBestPt = bNextPt; |
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|
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if( distSq < kRealSmall ) |
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retVal = true; |
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|
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minDistSq = distSq; |
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} |
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|
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if( i & 0x1 ) |
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{ |
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bIdx0++; |
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bIdx1 = bIdx0 < 2 ? bIdx0+1 : 0; |
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bIdx2 = bIdx1 < 2 ? bIdx1+1 : 0; |
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} |
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else |
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{ |
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int t = bIdx1; |
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bIdx1 = bIdx2; |
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bIdx2 = t; |
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} |
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} |
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cp0 = aBestPt; |
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cp1 = bBestPt; |
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|
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return retVal; |
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} |
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|
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#else // TRASH THIS |
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|
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hsBool plClosest::PointBetweenBoxes(const hsPoint3& aCorner, |
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const hsVector3* aAxes[3], |
|
const hsPoint3& bCorner, |
|
const hsVector3* bAxes[3], |
|
hsPoint3& cp0, hsPoint3& cp1) |
|
{ |
|
/* |
|
Six combinations to try to go through every possible |
|
combination of axes from A and B |
|
|
|
00 00 01 01 02 02 |
|
11 12 12 10 10 11 |
|
22 21 20 22 21 20 |
|
*/ |
|
|
|
struct trial { |
|
int aIdx[3]; |
|
int bIdx[3]; |
|
} trials[36]; |
|
|
|
|
|
int tNext = 0; |
|
int k,l; |
|
for( k = 0; k < 3; k++ ) |
|
{ |
|
for( l = 0; l < 3; l++ ) |
|
{ |
|
int kPlus = k < 2 ? k+1 : 0; |
|
int kPlusPlus = kPlus < 2 ? kPlus+1 : 0; |
|
|
|
int lPlus = l < 2 ? l+1 : 0; |
|
int lPlusPlus = lPlus < 2 ? lPlus+1 : 0; |
|
|
|
trials[tNext].aIdx[0] = k; |
|
trials[tNext].bIdx[0] = l; |
|
|
|
trials[tNext].aIdx[1] = kPlus; |
|
trials[tNext].bIdx[1] = lPlus; |
|
|
|
trials[tNext].aIdx[2] = kPlusPlus; |
|
trials[tNext].bIdx[2] = lPlusPlus; |
|
|
|
tNext++; |
|
|
|
trials[tNext].aIdx[0] = k; |
|
trials[tNext].bIdx[0] = l; |
|
|
|
trials[tNext].aIdx[1] = kPlusPlus; |
|
trials[tNext].bIdx[1] = lPlusPlus; |
|
|
|
trials[tNext].aIdx[2] = kPlus; |
|
trials[tNext].bIdx[2] = lPlus; |
|
|
|
tNext++; |
|
|
|
trials[tNext].aIdx[0] = k; |
|
trials[tNext].bIdx[0] = l; |
|
|
|
trials[tNext].aIdx[1] = kPlus; |
|
trials[tNext].bIdx[1] = lPlusPlus; |
|
|
|
trials[tNext].aIdx[2] = kPlusPlus; |
|
trials[tNext].bIdx[2] = lPlus; |
|
|
|
tNext++; |
|
|
|
trials[tNext].aIdx[0] = k; |
|
trials[tNext].bIdx[0] = l; |
|
|
|
trials[tNext].aIdx[1] = kPlusPlus; |
|
trials[tNext].bIdx[1] = lPlus; |
|
|
|
trials[tNext].aIdx[2] = kPlus; |
|
trials[tNext].bIdx[2] = lPlusPlus; |
|
|
|
tNext++; |
|
} |
|
} |
|
|
|
hsPoint3 aBestPt, bBestPt; |
|
hsScalar minDistSq = 1.e33f; |
|
|
|
hsBool retVal = false; |
|
|
|
int i; |
|
for( i = 0; i < 36; i++ ) |
|
{ |
|
hsPoint3 aCurrPt = aCorner; |
|
hsPoint3 bCurrPt = bCorner; |
|
|
|
hsPoint3 aNextPt, bNextPt; |
|
PointsOnLines(aCurrPt, *aAxes[trials[i].aIdx[0]], |
|
bCurrPt, *bAxes[trials[i].bIdx[0]], |
|
aNextPt, bNextPt, |
|
plClosest::kClamp); |
|
|
|
aCurrPt = aNextPt; |
|
bCurrPt = bNextPt; |
|
|
|
PointsOnLines(aCurrPt, *aAxes[trials[i].aIdx[1]], |
|
bCurrPt, *bAxes[trials[i].bIdx[1]], |
|
aNextPt, bNextPt, |
|
plClosest::kClamp); |
|
|
|
aCurrPt = aNextPt; |
|
bCurrPt = bNextPt; |
|
|
|
PointsOnLines(aCurrPt, *aAxes[trials[i].aIdx[2]], |
|
bCurrPt, *bAxes[trials[i].bIdx[2]], |
|
aNextPt, bNextPt, |
|
plClosest::kClamp); |
|
|
|
|
|
hsScalar distSq = hsVector3(&aNextPt, &bNextPt).MagnitudeSquared(); |
|
if( distSq < minDistSq ) |
|
{ |
|
aBestPt = aNextPt; |
|
bBestPt = bNextPt; |
|
|
|
if( distSq < kRealSmall ) |
|
retVal = true; |
|
|
|
minDistSq = distSq; |
|
} |
|
|
|
} |
|
cp0 = aBestPt; |
|
cp1 = bBestPt; |
|
|
|
return retVal; |
|
} |
|
#endif // TRASH THIS
|