def hidden_status(self, faces, mx, mx_n):
# sort out back-faces = with normals pointed away from camera
#print 'HIDDEN_LINES: caution! not full implemented yet'
front_faces = []
front_edges = []
for f in faces:
#print 'deb: face=', f #---------
#print 'deb: dir(face)=', dir(f) #---------
# get its normal-vector in localCS
vec_normal = f.no.copy()
#print 'deb: vec_normal=', vec_normal #------------------
# must be transferred to camera/view-CS
vec_normal @= mx_n
#vec_normal *= mb.rotationPart()
#print 'deb:2vec_normal=', vec_normal #------------------
#vec_normal *= mw0.rotationPart()
#print 'deb:3vec_normal=', vec_normal, '\n' #------------------
frontFace = False
if not self.PERSPECTIVE: #for ortho mode ----------
# normal must point the Z direction-hemisphere
if vec_normal[2] > 0.00001:
frontFace = True
else:
v = f.verts[0]
vert = mathutils.Vector(v.co) @ mx
if mathutils.DotVecs(vert, vec_normal) < 0.00001:
frontFace = True
if frontFace:
front_faces.append(f.index)
for key in f.edge_keys:
#this test can be done faster with set()
if key not in front_edges:
front_edges.append(key)
#print 'deb: amount of visible faces=', len(front_faces) #---------
#print 'deb: visible faces=', front_faces #---------
#print 'deb: amount of visible edges=', len(front_edges) #---------
#print 'deb: visible edges=', front_edges #---------
return front_faces, front_edges
def M_DotVecs(self, v1, v2):
if 'cross' in dir(mathutils.Vector()):
return v1.dot(v2) #for up2.49
else:
return mathutils.DotVecs(v1, v2) #for pre2.49
