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Mark Mine 2003-06-21 16:49:37 +00:00
parent 029f99a1cc
commit 22fe2af816
1 changed files with 6 additions and 9 deletions
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15
direct/src/directtools/DirectSelection.py
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@ -659,19 +659,16 @@ class SelectionSphere(SelectionQueue):
def isEntryBackfacing(self, entry): def isEntryBackfacing(self, entry):
# If dot product of collision point surface normal and # If dot product of collision point surface normal and
# ray from sphere origin to collision point is positive, we are # ray from sphere origin to collision point is positive,
# looking at the backface of the polygon # center is on the backside of the polygon
ip = entry.getFromIntersectionPoint()
c = entry.getFrom().getCenter()
n = entry.getFromSurfaceNormal()
v = Vec3(entry.getFromIntersectionPoint() - v = Vec3(entry.getFromIntersectionPoint() -
entry.getFrom().getCenter()) entry.getFrom().getCenter())
# Normalize and check angle between to vectors n = entry.getFromSurfaceNormal()
print '(%0.2f, %0.2f, %0.2f), (%0.2f, %0.2f, %0.2f), (%0.2f, %0.2f, %0.2f), %0.2f' %(ip[0],ip[1],ip[2],c[0],c[1],c[2],n[0],n[1],n[2], v.dot(n)) # If points almost on top of each other, reject face
# (treat as backfacing)
if v.length() < 0.05: if v.length() < 0.05:
# Points almost on top of each other,
# reject face (treat as backfacing)
return 1 return 1
# Normalize and check angle between to vectors
v.normalize() v.normalize()
return v.dot(n) >= 0 return v.dot(n) >= 0