def checkInter(self, objlist):
min_length = 1.0e8
min_object = face(vector3(0.0,0.0,0.0), vector3(0.0,0.0,0.0), 0)
for element in objlist:
dest = self.intersection(element)
if vector3.norm(dest) < min_length :
min_length = vector3.norm(dest)
min_object = element
i_point = vector3.add_vec(self.point, vector3.mul_vec(self.direction, min_length))
return i_point, min_object
def checkShadow(self, start, light, objlist):
occluded = 0
o2light = vector3.nrm_vec(vector3.sub_vec(light.point, start))
min_length = vector3.norm(o2light)
if min_length > 1.0e6 : print "a"; return 0
ray2light = ray(vector3.sub_vec(start,vector3.mul_vec(o2light, -1.0e-8)), o2light)
for element in objlist:
dest = ray2light.intersection(element)
if vector3.norm(dest) < min_length :
occluded = 1
return occluded
