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physx/source/physxextensions/src/ExtConvexMeshExt.cpp Normal file
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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#include "foundation/PxTransform.h"
#include "geometry/PxConvexMeshGeometry.h"
#include "geometry/PxConvexMesh.h"
#include "extensions/PxConvexMeshExt.h"
using namespace physx;
static const PxReal gEpsilon = .01f;
PxU32 physx::PxFindFaceIndex(const PxConvexMeshGeometry& convexGeom, const PxTransform& pose,
const PxVec3& impactPos, const PxVec3& unitDir)
{
PX_ASSERT(unitDir.isFinite());
PX_ASSERT(unitDir.isNormalized());
PX_ASSERT(impactPos.isFinite());
PX_ASSERT(pose.isFinite());
const PxVec3 impact = impactPos - unitDir * gEpsilon;
const PxVec3 localPoint = pose.transformInv(impact);
const PxVec3 localDir = pose.rotateInv(unitDir);
// Create shape to vertex scale transformation matrix
const PxMeshScale& meshScale = convexGeom.scale;
const PxMat33 rot(meshScale.rotation);
PxMat33 shape2VertexSkew = rot.getTranspose();
const PxMat33 diagonal = PxMat33::createDiagonal(PxVec3(1.0f / meshScale.scale.x, 1.0f / meshScale.scale.y, 1.0f / meshScale.scale.z));
shape2VertexSkew = shape2VertexSkew * diagonal;
shape2VertexSkew = shape2VertexSkew * rot;
const PxU32 nbPolys = convexGeom.convexMesh->getNbPolygons();
PxU32 minIndex = 0;
PxReal minD = PX_MAX_REAL;
for (PxU32 j = 0; j < nbPolys; j++)
{
PxHullPolygon hullPolygon;
convexGeom.convexMesh->getPolygonData(j, hullPolygon);
// transform hull plane into shape space
PxPlane plane;
const PxVec3 tmp = shape2VertexSkew.transformTranspose(PxVec3(hullPolygon.mPlane[0],hullPolygon.mPlane[1],hullPolygon.mPlane[2]));
const PxReal denom = 1.0f / tmp.magnitude();
plane.n = tmp * denom;
plane.d = hullPolygon.mPlane[3] * denom;
PxReal d = plane.distance(localPoint);
if (d < 0.0f)
continue;
const PxReal tweak = plane.n.dot(localDir) * gEpsilon;
d += tweak;
if (d < minD)
{
minIndex = j;
minD = d;
}
}
return minIndex;
}