CWE-ou-minkata/Sources/Tools/MaxMain/plMaxMeshExtractor.cpp

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*==LICENSE==*/
#include "plMaxMeshExtractor.h"
#include "Max.h"
#include "plMaxNode.h"
#include "dummy.h"

static Mesh* ExtractMesh(INode* pNode, TriObject** ppDeleteMe)
{
    Object *obj = pNode->EvalWorldState(0).obj;
    Mesh *pRetMesh = nil;

    if( obj ) {

        if( obj->CanConvertToType(triObjectClassID) ) {

            // Convert to triangle object
            TriObject *tri = (TriObject*)obj->ConvertToType(0, triObjectClassID);

            if (tri != obj) *ppDeleteMe = tri;  // if Convert allocated, pass back so caller can delete.

            if( tri ) {
                Mesh *pTMesh = &tri->mesh;

                if( pTMesh->getNumFaces() ) {
                    pRetMesh = pTMesh;
                }
            }
        }
    }
    return pRetMesh;
}

// Return the two points defining the bounding box for the given vertices.
static void MeshMinMax(hsPoint3& min, hsPoint3& max, int numVerts, hsPoint3* pVerts)
{
    for (int i = 0; i < numVerts; i++)
    {
        hsPoint3* vert = &pVerts[i];
        min.fX = hsMinimum(vert->fX, min.fX);
        min.fY = hsMinimum(vert->fY, min.fY);
        min.fZ = hsMinimum(vert->fZ, min.fZ);
        max.fX = hsMaximum(vert->fX, max.fX);
        max.fY = hsMaximum(vert->fY, max.fY);
        max.fZ = hsMaximum(vert->fZ, max.fZ);
    }
}

static bool MakeNormalMesh(plMaxNode *node, plMaxMeshExtractor::NeutralMesh& mesh, Matrix3* w2l)
{
    TriObject *pDeleteMe = nil;
    Mesh *pMesh = ExtractMesh(node, &pDeleteMe);    // allocates *sometimes*; check pDeleteMe

    if (!pMesh)
        return false;

    Matrix3 fullTM = node->GetObjectTM(0);
    int parity = fullTM.Parity();

    mesh.fNumVerts = pMesh->numVerts;
    mesh.fVerts = TRACKED_NEW hsPoint3[mesh.fNumVerts];

    for (int i = 0; i < mesh.fNumVerts; i++)
    {
        // convert the vertex to global coordinates
        Point3 newVert = fullTM * pMesh->verts[i];
        // convert the vertex to the new (requested) coordinate system
        if (w2l)
            newVert = (*w2l) * newVert;

        mesh.fVerts[i].Set(newVert.x, newVert.y, newVert.z);
    }

    mesh.fNumFaces = pMesh->numFaces;
    mesh.fFaces = TRACKED_NEW UInt16[mesh.fNumFaces*3];
    for (int i = 0; i < mesh.fNumFaces; i++)
    {
        Face* pFace = &pMesh->faces[i];
        UInt16* pNFace = &mesh.fFaces[i * 3];

        pNFace[0] = pFace->v[ parity ? 2 : 0 ]; // reverse winding if parity backwards
        pNFace[1] = pFace->v[1];
        pNFace[2] = pFace->v[ parity ? 0 : 2 ]; // ''
    }

    if (pDeleteMe)
        delete pDeleteMe;

    return true;
}

// BUILDBOXMESH
// Build the minimum bounding box (triangles and all) enclosing the given vertices
// DELETES the given vertex and face array
// ALLOCATES a new vertex and face array
// MODIFIES *all* the input parameters.
static void MakeBoxMesh(plMaxNode* node, plMaxMeshExtractor::NeutralMesh& mesh, hsPoint3& minV, hsPoint3& maxV)
{
    hsPoint3* newVerts = TRACKED_NEW hsPoint3[8];
    UInt16* newFaces = TRACKED_NEW UInt16[12 * 3];

    newVerts[0].Set(minV.fX, minV.fY, minV.fZ);
    newVerts[1].Set(maxV.fX, minV.fY, minV.fZ);
    newVerts[2].Set(minV.fX, maxV.fY, minV.fZ);
    newVerts[3].Set(maxV.fX, maxV.fY, minV.fZ);
    newVerts[4].Set(minV.fX, minV.fY, maxV.fZ);
    newVerts[5].Set(maxV.fX, minV.fY, maxV.fZ);
    newVerts[6].Set(minV.fX, maxV.fY, maxV.fZ);
    newVerts[7].Set(maxV.fX, maxV.fY, maxV.fZ);

    UInt16 standardFaces[] = { 0, 2, 1,
        1, 2, 3,
        0, 1, 4,
        1, 5, 4,
        0, 4, 2,
        2, 4, 6,
        1, 3, 7,
        7, 5, 1,
        3, 2, 7,
        2, 6, 7,
        4, 7, 6,
        4, 5, 7 };

    memcpy(newFaces, standardFaces, sizeof(standardFaces));

    delete [] mesh.fVerts;
    mesh.fVerts = newVerts;
    delete [] mesh.fFaces;
    mesh.fFaces = newFaces;
    mesh.fNumVerts = 8;
    mesh.fNumFaces = 12;
}

static void MakeDummyMesh(plMaxNode* node, plMaxMeshExtractor::NeutralMesh& mesh)
{
    hsPoint3 minV, maxV;

    Object* thisObj = node->GetObjectRef();
    DummyObject* thisDummy = (DummyObject*)thisObj;
    Box3 thisBoundSurface = thisDummy->GetBox();
    minV.fX = thisBoundSurface.Min().x;
    minV.fY = thisBoundSurface.Min().y;
    minV.fZ = thisBoundSurface.Min().z;
    maxV.fX = thisBoundSurface.Max().x;
    maxV.fY = thisBoundSurface.Max().y;
    maxV.fZ = thisBoundSurface.Max().z;

    MakeBoxMesh(node, mesh, minV, maxV);
}

// CREATEPLHKPHYSICALFROMMESHEASY
// Convenience function for getting from a max node to a plHKPhysical and the requisite
// Havok objects.
// The node and the scene object don't have to correspond to the same Max object.
// If the sAltNode is supplied, the node will be moved into the coordinate system of the
bool plMaxMeshExtractor::Extract(plMaxMeshExtractor::NeutralMesh& mesh, plMaxNode* node, bool makeAABB, plMaxNode* sOwningNode)
{
    mesh.fNumVerts = mesh.fNumFaces = 0;
    mesh.fVerts = nil;
    mesh.fFaces = nil;

    // if an alternate node was supplied, get its scene object. otherwise don't...
    plMaxNode* masterNode = sOwningNode ? sOwningNode : node;

    mesh.fL2W = masterNode->GetLocalToWorld44();

    //
    // Create the arrays of verts and faces
    //
    hsBool isDummy = (node->EvalWorldState(0).obj->ClassID() == Class_ID(DUMMY_CLASS_ID,0));
    if (isDummy)
    {
        hsMatrix44 w2l = masterNode->GetWorldToLocal44();
        MakeDummyMesh(node, mesh);
        // Localize the verts
        //for (int i = 0; i < mesh.fNumVerts; i++)
        //  mesh.fVerts[i] = w2l * mesh.fVerts[i];
    }
    else
    {
        // only get the max world-to-local transform if the node is moveable or instanced. otherwise verts stay global.
        Matrix3 w2l = masterNode->GetWorldToLocal();
//      Matrix3 *localizer = nil;
//      if (masterNode->IsMovable() || masterNode->GetForceLocal() || masterNode->GetInstanced())
//          localizer = &w2l;

        if (!MakeNormalMesh(node, mesh, &w2l))
            return false;

        if (makeAABB)
        {
            hsPoint3 minV(FLT_MAX, FLT_MAX, FLT_MAX), maxV(-FLT_MAX, -FLT_MAX, -FLT_MAX);
            MeshMinMax(minV, maxV, mesh.fNumVerts, mesh.fVerts);
            MakeBoxMesh(node, mesh, minV, maxV);
        }
    }

    return true;
}