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TinyRenderer, apply backface culling

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This commit is contained in:
Erwin Coumans
2017-04-13 11:06:38 -07:00
parent 5158c1ae98
commit c3cc53d5aa
1 changed files with 10 additions and 0 deletions
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10
examples/TinyRenderer/TinyRenderer.cpp
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@@ -424,6 +424,16 @@ static void clipEdge(const mat<4,3,float>& triangleIn, int vertexIndexA, int ver
static bool clipTriangleAgainstNearplane(const mat<4,3,float>& triangleIn, b3AlignedObjectArray<mat<4,3,float> >& clippedTrianglesOut) static bool clipTriangleAgainstNearplane(const mat<4,3,float>& triangleIn, b3AlignedObjectArray<mat<4,3,float> >& clippedTrianglesOut)
{ {
float orientation = (triangleIn[0][1] - triangleIn[0][0]) * (triangleIn[1][2] - triangleIn[1][0])
- (triangleIn[1][1] - triangleIn[1][0]) * (triangleIn[0][2] - triangleIn[0][0]);
if (orientation < 0.0)
{
return true;
}
//discard triangle if all vertices are behind near-plane //discard triangle if all vertices are behind near-plane
if (triangleIn[3][0]<0 && triangleIn[3][1] <0 && triangleIn[3][2] <0) if (triangleIn[3][0]<0 && triangleIn[3][1] <0 && triangleIn[3][2] <0)
{ {