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some collisions don't have surface normals

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This commit is contained in:
David Rose 2003-07-01 16:49:49 +00:00
parent f4afb983a4
commit 1e600848e7
1 changed files with 4 additions and 0 deletions
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4
direct/src/directtools/DirectSelection.py
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@ -476,6 +476,10 @@ class SelectionQueue(CollisionHandlerQueue):
# If dot product of collision point surface normal and # If dot product of collision point surface normal and
# ray from camera to collision point is positive, we are # ray from camera to collision point is positive, we are
# looking at the backface of the polygon # looking at the backface of the polygon
if not entry.hasFromSurfaceNormal():
# Well, no way to tell. Assume we're not backfacing.
return 0
v = Vec3(entry.getFromIntersectionPoint()) v = Vec3(entry.getFromIntersectionPoint())
n = entry.getFromSurfaceNormal() n = entry.getFromSurfaceNormal()
# Convert to camera space for backfacing test # Convert to camera space for backfacing test