void ClippedPolyList::generateNormals()
{
PROFILE_SCOPE( ClippedPolyList_GenerateNormals );
AssertFatal(mNormalList.size() == mVertexList.size(), "Normals count does not match vertex count!");
U32 i, polyCount;
VectorF normal;
PolyListIterator polyIter;
IndexListIterator indexIter;
Vector<VectorF>::iterator normalIter = mNormalList.begin();
U32 n = 0;
for ( ; normalIter != mNormalList.end(); normalIter++, n++ )
{
// Skip normals that already have values.
if ( !normalIter->isZero() )
continue;
// Average all the face normals which
// share this vertex index.
indexIter = mIndexList.begin();
normal.zero();
polyCount = 0;
i = 0;
for ( ; indexIter != mIndexList.end(); indexIter++, i++ )
{
if ( n != *indexIter )
continue;
polyIter = mPolyList.begin();
for ( ; polyIter != mPolyList.end(); polyIter++ )
{
const Poly& poly = *polyIter;
if ( i < poly.vertexStart || i > poly.vertexStart + poly.vertexCount )
continue;
++polyCount;
normal += poly.plane;
}
}
// Average it.
if ( polyCount > 0 )
normal /= (F32)polyCount;
// Note: we use a temporary for the normal averaging
// then copy the result to limit the number of arrays
// we're touching during the innermost loop.
*normalIter = normal;
}
}
void ConvexFeature::testEdge(ConvexFeature* cf,const Point3F& s1, const Point3F& e1, CollisionList* cList, F32 tol)
{
F32 tolSquared = tol*tol;
// Test edges against edges
const Edge* edge = mEdgeList.begin();
const Edge* end = mEdgeList.end();
for (; edge != end; edge++) {
if (cList->getCount() >= CollisionList::MaxCollisions)
return;
const Point3F& s2 = mVertexList[edge->vertex[0]];
const Point3F& e2 = mVertexList[edge->vertex[1]];
// Get the distance and closest points
Point3F i1,i2;
F32 distance = sqrDistanceEdges(s1, e1, s2, e2, &i1, &i2);
if (distance > tolSquared)
continue;
distance = mSqrt(distance);
// Need to figure out how to orient the collision normal.
// The current test involves checking to see whether the collision
// points are contained within the convex volumes, which is slow.
if (inVolume(i1) || cf->inVolume(i2))
distance = -distance;
// Contact normal
VectorF normal = i1 - i2;
if ( mIsZero( distance ) )
normal.zero();
else
normal *= 1 / distance;
// Return a collision
Collision& info = cList->increment();
info.point = i1;
info.normal = normal;
info.distance = distance;
info.material = material;
info.object = object;
}
}
