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Fix the bug about the direction of Normal. #67

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Fix the bug about the direction of Normal. #67

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4 changes: 2 additions & 2 deletions src/shapes/triangle.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -322,7 +322,7 @@ bool Triangle::Intersect(const Ray &ray, Float *tHit, SurfaceInteraction *isect,
this);

// Override surface normal in _isect_ for triangle
isect->n = isect->shading.n = Normal3f(Normalize(Cross(dp02, dp12)));
isect->n = isect->shading.n = Normal3f(Normalize(Cross(dp12, dp02)));
if (mesh->n || mesh->s) {
// Initialize _Triangle_ shading geometry

Expand Down Expand Up @@ -551,7 +551,7 @@ Interaction Triangle::Sample(const Point2f &u) const {
it.n = Normalize(b[0] * mesh->n[v[0]] + b[1] * mesh->n[v[1]] +
(1 - b[0] - b[1]) * mesh->n[v[2]]);
else
it.n = Normalize(Normal3f(Cross(p1 - p0, p2 - p0)));
it.n = Normalize(Normal3f(Cross(p2 - p0, p1 - p0)));
if (reverseOrientation) it.n *= -1;

// Compute error bounds for sampled point on triangle
Expand Down