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
def intersection (self, obj):
k = 0.0
if obj.radius > 0.0: #sphere
o2e = vector3.sub_vec(self.point, obj.point)
half_b = vector3.dot_vec(o2e, self.direction)
c = vector3.dot_vec(o2e,o2e) - obj.radius*obj.radius
if half_b*half_b - c >= 0:
k = -half_b - sqrt(half_b*half_b - c)
else :
k = 1.0e8
else : #face
o2e = vector3.sub_vec(self.point, obj.point)
b = vector3.dot_vec(self.direction,obj.normal)
if abs(b) > 1.0e-3 :
k = -(vector3.dot_vec(o2e,obj.normal)) / b
else :
k = 1.0e8
if k<0 : k = 1.0e8
return vector3.mul_vec(self.direction, k)
def reflect(self, face, normal):
self.point = self.intersection(face)
''' calc direction '''
tmp_vec = vector3.mul_vec(normal, 2*vector3.dot_vec(self.direction, normal))
self.direction = vector3.sub_vec(self.direction, tmp_vec)
