smooth triangles (aka Phong shading)
extend Python binding to support vertex normals and smooth triangles
make bunny.py and realtime_dragon smooth, and fix other demos for new triangle constructor
add Vector::operator/=
#!/usr/bin/python# this demo needs bunny model from# http://graphics.stanford.edu/data/3Dscanrep/import syssys.path.append(open('ModulePath').read().strip())from raytracer import Raytracer, Light, Sphere, Triangle, NormalVertex, Materialimport Imagedef LoadStanfordPlyFile(rt, mat, filename, scale): vertices = [] normals = [] vertex_face_num = [] fp = file(filename) # read header tokens = (0,) while (tokens[0] != "end_header"): tokens = fp.readline().split() if (tokens[0] == "element"): if (tokens[1] == "vertex"): vertex_num = int(tokens[2]) if (tokens[1] == "face"): face_num = int(tokens[2]) # read vertices num = vertex_num while (num): tokens = fp.readline().split() v = [scale*float(x) for x in tokens[0:3]] v[0] = -v[0]-1 v[1] = v[1]-3 vertices.append(NormalVertex(tuple(v))) normals.append([0.,0.,0.]) vertex_face_num.append(0) num -= 1 # read faces while (face_num): tokens = fp.readline().split() if (tokens[0] != "3"): print "ply warning: faces of %d vertices not supported" % tokens[0] v = [vertices[int(x)] for x in tokens[1:4]] face = Triangle(v[0], v[2], v[1], mat) n = face.getNormal() for x in tokens[1:4]: for i in range(3): normals[int(x)][i] += n[i] vertex_face_num[int(x)] += 1 face.setSmooth() rt.addshape(face) face_num -= 1 # interpolate normals at vertices num = 0 while (num < vertex_num): if (vertex_face_num[num] > 0): for i in range(3): normals[num][i] /= vertex_face_num[num] vertices[num].setNormal(tuple(normals[num])) num += 1rt = Raytracer()mat = Material(colour=(0.9, 0.9, 0.9))LoadStanfordPlyFile(rt, mat, "../models/bunny/bun_zipper.ply", 29.0)light = Light(position=(-5.0, 2.0, 10.0), colour=(0.9, 0.3, 0.6))rt.addlight(light)light2 = Light(position=(4.0, -3.0, 10.0), colour=(0.2, 0.9, 0.5))rt.addlight(light2)imagesize = (800, 600)data = rt.render(imagesize)img = Image.fromstring("RGB", imagesize, data)img.save('bunny.png')