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 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 __init__(self, ppnt, pdir):
self.point = ppnt
self.direction = vector3.nrm_vec(pdir)
