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Author: arobison
Date: Tue Feb 12 02:25:29 2008
New Revision: 2052

Modified:
   trunk/Model/Primitives/KenslerShirleyTriangle.cc
Log:
Making sure there actually are UVs before trying to create
a parameterization based on them, plus swizzling the barycentric
coordinates passed to the new spline method from KenslerShirley
triangles to match the computed coordinates; surface derivatives
are nearly smooth, one bug remaining it would seem.


Modified: trunk/Model/Primitives/KenslerShirleyTriangle.cc
==============================================================================
--- trunk/Model/Primitives/KenslerShirleyTriangle.cc    (original)
+++ trunk/Model/Primitives/KenslerShirleyTriangle.cc    Tue Feb 12 02:25:29 
2008
@@ -48,12 +48,23 @@
 
 void KenslerShirleyTriangle::computeSurfaceDerivatives(const RenderContext& 
context, RayPacket& rays) const
 {
+  const int which = myID*3;
+  const unsigned int uv0_idx = mesh->texture_indices.size() ?
+    mesh->texture_indices[which] : Mesh::kNoTextureIndex;
+
+  // No texture coords means use the default implementation
+  if (uv0_idx == Mesh::kNoTextureIndex) {
+    Primitive::computeSurfaceDerivatives(context, rays);
+    return;
+  }
+
   for(int i = rays.begin(); i != rays.end(); ++i) {
+
     float a = rays.getScratchpad<float>(SCRATCH_U)[i];
     float b = rays.getScratchpad<float>(SCRATCH_V)[i];
 
     Vector dPdu, dPdv;
-    computeSplineSurfaceDerivatives(a,b, dPdu,dPdv);
+    computeSplineSurfaceDerivatives((1-a-b),a, dPdu,dPdv);
 
     rays.setSurfaceDerivativeU(i, dPdu);
     rays.setSurfaceDerivativeV(i, dPdv);

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• [Manta] r2052 - trunk/Model/Primitives, Austin Robison, 02/12/2008

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