korman/korman/properties/modifiers/physics.py

#    This file is part of Korman.
#
#    Korman is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    Korman is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with Korman.  If not, see <http://www.gnu.org/licenses/>.

import bpy
from bpy.props import *
from PyHSPlasma import *

from .base import PlasmaModifierProperties
from ...exporter import ExportError

# These are the kinds of physical bounds Plasma can work with.
# This sequence is acceptable in any EnumProperty
bounds_types = (
    ("box", "Bounding Box", "Use a perfect bounding box"),
    ("sphere", "Bounding Sphere", "Use a perfect bounding sphere"),
    ("hull", "Convex Hull", "Use a convex set encompasing all vertices"),
    ("trimesh", "Triangle Mesh", "Use the exact triangle mesh (SLOW!)")
)

def bounds_type_index(key):
    return list(zip(*bounds_types))[0].index(key)

def _set_phys_prop(prop, sim, phys, value=True):
    """Sets properties on plGenericPhysical and plSimulationInterface (seeing as how they are duped)"""
    sim.setProperty(prop, value)
    phys.setProperty(prop, value)


class PlasmaCollider(PlasmaModifierProperties):
    pl_id = "collision"

    bl_category = "Physics"
    bl_label = "Collision"
    bl_icon = "MOD_PHYSICS"
    bl_description = "Simple physical collider"

    bounds = EnumProperty(name="Bounds Type", description="", items=bounds_types, default="hull")

    avatar_blocker = BoolProperty(name="Blocks Avatars", description="Object blocks avatars", default=True)
    camera_blocker = BoolProperty(name="Blocks Camera LOS", description="Object blocks camera line-of-sight", default=True)

    friction = FloatProperty(name="Friction", min=0.0, default=0.5)
    restitution = FloatProperty(name="Restitution", description="Coefficient of collision elasticity", min=0.0, max=1.0)
    terrain = BoolProperty(name="Terrain", description="Object represents the ground", default=False)

    dynamic = BoolProperty(name="Dynamic", description="Object can be influenced by other objects (ie is kickable)", default=False)
    mass = FloatProperty(name="Mass", description="Mass of object in pounds", min=0.0, default=1.0)
    start_asleep = BoolProperty(name="Start Asleep", description="Object is not active until influenced by another object", default=False)

    def export(self, exporter, bo, so):
        # All modifier properties are examined by this little stinker...
        exporter.physics.generate_physical(bo, so)

    @property
    def requires_actor(self):
        return self.dynamic


class PlasmaSubworld(PlasmaModifierProperties):
    pl_id = "subworld_def"

    bl_category = "Physics"
    bl_label = "Subworld"
    bl_description = "Subworld definition"
    bl_icon = "WORLD"

    sub_type = EnumProperty(name="Subworld Type",
                            description="Specifies the physics strategy to use for this subworld",
                            items=[("auto", "Auto", "Korman will decide which physics strategy to use"),
                                   ("dynamicav", "Dynamic Avatar", "Allows the avatar to affected by dynamic physicals"),
                                   ("subworld", "Separate World", "Causes all objects to be placed in a separate physics simulation")],
                            default="auto",
                            options=set())
    gravity = FloatVectorProperty(name="Gravity",
        description="Subworld's gravity defined in feet per second squared",
        size=3, default=(0.0, 0.0, -32.174), precision=3,
        subtype="ACCELERATION", unit="ACCELERATION")

    def export(self, exporter, bo, so):
        if self.is_dedicated_subworld(exporter):
            # NOTE to posterity... Cyan's PotS/Havok subworlds appear to have a
            # plHKPhysical object that is set as LOSOnly convex hull. They appear to
            # be a bounding box. PyPRP generated PRPs do not do this and work just fine,
            # however, so this is probably just a quirk of the Havok-era PlasmaMAX
            subworld = exporter.mgr.find_create_object(plHKSubWorld, so=so)
            subworld.gravity = hsVector3(*self.gravity)

    def is_dedicated_subworld(self, exporter):
        if exporter.mgr.getVer() != pvMoul:
            return True
        if self.sub_type == "subworld":
            return True
        elif self.sub_type == "dynamicav":
            return False
        else:
            return not self.property_unset("gravity")

    def post_export(self, exporter, bo, so):
        # It appears PotS does something really fancy with subworlds under the hood such that
        # if you make a subworld that has collision, it will get into an infinite loop in
        # plCoordinateInterface::IGetRoot. Not really sure why this happens (nor do I care),
        # but we definitely don't want it to happen.
        if bo.type != "EMPTY":
            exporter.report.warn("Subworld '{}' is attached to a '{}'--this should be an empty.", bo.name, bo.type, indent=1)
        if so.sim:
            if exporter.mgr.getVer() > pvPots:
                exporter.report.port("Subworld '{}' has physics data--this will cause PotS to crash.", bo.name, indent=1)
            else:
                raise ExportError("Subworld '{}' cannot have physics data (should be an empty).".format(bo.name))