def pointInTri2D(v, v1, v2, v3):
global dict_matrix
key = v1.x, v1.y, v2.x, v2.y, v3.x, v3.y
# Commented because its slower to do teh bounds check, we should realy cache the bounds info for each face.
'''
# BOUNDS CHECK
xmin= 1000000
ymin= 1000000
xmax= -1000000
ymax= -1000000
for i in (0,2,4):
x= key[i]
y= key[i+1]
if xmax<x: xmax= x
if ymax<y: ymax= y
if xmin>x: xmin= x
if ymin>y: ymin= y
x= v.x
y= v.y
if x<xmin or x>xmax or y < ymin or y > ymax:
return False
# Done with bounds check
'''
try:
mtx = dict_matrix[key]
if not mtx:
return False
except:
side1 = v2 - v1
side2 = v3 - v1
nor = side1.cross(side2)
l1 = [side1[0], side1[1], side1[2]]
l2 = [side2[0], side2[1], side2[2]]
l3 = [nor[0], nor[1], nor[2]]
mtx = Matrix(l1, l2, l3)
# Zero area 2d tri, even tho we throw away zerop area faces
# the projection UV can result in a zero area UV.
if not mtx.determinant():
dict_matrix[key] = None
return False
mtx.invert()
dict_matrix[key] = mtx
uvw = (v - v1) * mtx
return 0 <= uvw[0] and 0 <= uvw[1] and uvw[0] + uvw[1] <= 1
def pointInTri2D(v, v1, v2, v3):
global dict_matrix
key = v1.x, v1.y, v2.x, v2.y, v3.x, v3.y
# Commented because its slower to do teh bounds check, we should realy cache the bounds info for each face.
"""
# BOUNDS CHECK
xmin= 1000000
ymin= 1000000
xmax= -1000000
ymax= -1000000
for i in (0,2,4):
x= key[i]
y= key[i+1]
if xmax<x: xmax= x
if ymax<y: ymax= y
if xmin>x: xmin= x
if ymin>y: ymin= y
x= v.x
y= v.y
if x<xmin or x>xmax or y < ymin or y > ymax:
return False
# Done with bounds check
"""
try:
mtx = dict_matrix[key]
if not mtx:
return False
except:
side1 = v2 - v1
side2 = v3 - v1
nor = side1.cross(side2)
l1 = [side1[0], side1[1], side1[2]]
l2 = [side2[0], side2[1], side2[2]]
l3 = [nor[0], nor[1], nor[2]]
mtx = Matrix(l1, l2, l3)
# Zero area 2d tri, even tho we throw away zerop area faces
# the projection UV can result in a zero area UV.
if not mtx.determinant():
dict_matrix[key] = None
return False
mtx.invert()
dict_matrix[key] = mtx
uvw = (v - v1) * mtx
return 0 <= uvw[0] and 0 <= uvw[1] and uvw[0] + uvw[1] <= 1
