gistfile1.py

#!/usr/bin/python

# Really simple example of usint cgkit's RenderMan
# Interface binding to generate a RIB file.
from __future__ import print_function
from cgkit.ri import *
from math import *

import sys

def x(t, u,v):
    return ((2 + 2 * sin(2*pi*t)) + sin(u)*cos(v)*cos(v))*cos(u)
def y(t, u,v):
    return ((2 + 2 * cos(2*pi*t)) + sin(u)*cos(v)*cos(v))*sin(u)
def z(t, u,v):
    return sin(2*pi*t+v)+sin(u)*cos(v)*sin(v)

def main(args):
    if len(args)<1:
        print("No argument given!")
        return
    
    RiBegin(RI_NULL)
    RiFormat(512,512, 1)

    usteps = 24
    vsteps = 48
    tsteps = 64

    t = 0
    umin = -pi
    vmin = -pi

    umax = pi
    vmax = pi

    tdiff = 1.0/tsteps
    udiff = (umax-umin)/usteps
    vdiff = (vmax-vmin)/vsteps
    
    fname=args[0]
    for i in range(0, tsteps):
        # print('{0}'.format(t), file=sys.stderr)
        RiFrameBegin(i);
        RiDisplay('output/{0}{1:04d}.tif'.format(fname, i),
                  "file","rgba", RI_NULL)
        RiLightSource("distantlight", RI_NULL)
        RiProjection("perspective", RI_NULL)
        RiTranslate(0.0, 0.0, 6.0)
        RiRotate(45.0, -1.0,1.0,0.0)

        RiWorldBegin()
        u = umin
        for j in range(0,usteps):

            v = vmin
            for k in range(0,vsteps):
                v += vdiff
                RiAttributeBegin()
                RiColor([0,1,0])
                RiSurface("plastic",RI_NULL)

                RiTranslate(x(t, u,v),
                            z(t, u,v),
                            y(t, u,v))

                RiSphere(pi/40,-pi/40,pi/40, 360.0, RI_NULL)
                RiAttributeEnd()
                v += vdiff

            u += udiff
        RiWorldEnd()
        RiFrameEnd()

        t += tdiff
    
    RiEnd()
    
if __name__=='__main__':
    main(sys.argv[1:])