#!/usr/bin/python

# this demo needs dragon model from

# http://graphics.stanford.edu/data/3Dscanrep/

import sys

sys.path.append("..")

from raytracer import Raytracer, Light, Sphere, Triangle, Material

import Image

def LoadStanfordPlyFile(rt, mat, filename, scale):

	vertices = []

	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

	while (vertex_num):

		tokens = fp.readline().split()

		v = [scale*float(x) for x in tokens[0:3]]

		#v[0] = -v[0]

		v[1] = v[1]-3.5

		#v[2] = -v[2]

		vertices.append(tuple(v))

		vertex_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]

		f = [vertices[int(x)] for x in tokens[1:4]]

		face = Triangle(f[0], f[1], f[2], mat)

		rt.addshape(face)

		face_num -= 1

rt = Raytracer()

mat = Material(colour=(0.9, 0.9, 0.9))

LoadStanfordPlyFile(rt, mat, "dragon_vrip.ply", 30.0)

light = Light(position=(-5.0, 2.0, -8.0), colour=(0.9, 0.3, 0.6))

rt.addlight(light)

imagesize = (800, 600)

data = rt.render(imagesize)

img = Image.fromstring("RGB", imagesize, data)

img.save('dragon.png')