def calcColor(self, light, objlist):
dest, i_obj = self.checkInter(objlist)
occluded = self.checkShadow(dest, light, objlist)
light2dest = vector3.nrm_vec(vector3.sub_vec(dest, light.point))
if i_obj.radius > 0.0 :
obj_normal = vector3.nrm_vec(vector3.sub_vec(dest,i_obj.point))
else :
obj_normal = i_obj.normal
shading = -vector3.dot_vec(light2dest, obj_normal)
if shading < 0.2 : shading = 0.2
d_color = i_obj.color
d_red = d_color & 255
d_grn = (d_color>>8) & 255
d_blu = (d_color>>16) & 255
d_red *= shading
d_grn *= shading
d_blu *= shading
if occluded > 0 :
penalty = 128
if d_red >= penalty : d_red -= penalty
else : d_red = 0
if d_grn >= penalty : d_grn -= penalty
else : d_grn = 0
if d_blu >= penalty : d_blu -= penalty
else : d_blu = 0
d_red = int(d_red)
d_grn = int(d_grn)
d_blu = int(d_blu)
return (int(d_red) + (int(d_grn)<<8) + (int(d_blu)<<16))
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)
