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fix mistake in tangent computation

David Rose 14 years ago
parent
5892019088
commit
e5272c9e3d
1 changed files with 1 additions and 1 deletions
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  1. 1 1
      panda/src/parametrics/nurbsCurveResult.cxx

+ 1 - 1
panda/src/parametrics/nurbsCurveResult.cxx
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@@ -100,7 +100,7 @@ eval_segment_point(int segment, float t, LVecBase3f &point) const {
 
 void NurbsCurveResult::
 
 void NurbsCurveResult::
 
 eval_segment_tangent(int segment, float t, LVecBase3f &tangent) const {
 
 eval_segment_tangent(int segment, float t, LVecBase3f &tangent) const {
 
   float t2 = t*t;
 
   float t2 = t*t;
 
-  LVecBase4f tvec(t2, t, 1.0f, 0.0f);
 
+  LVecBase4f tvec(3.0 * t2, 2.0 * t, 1.0f, 0.0f);
 
 
 
   tangent.set(tvec.dot(_composed[segment].get_col(0)),
 
   tangent.set(tvec.dot(_composed[segment].get_col(0)),
 
               tvec.dot(_composed[segment].get_col(1)),
 
               tvec.dot(_composed[segment].get_col(1)),