Masking Renderer

def material(color) {
  Materials.uniform( [ "ambient": color * 0.1,
                       "diffuse": color * 0.8,
                       "specular": Colors.black(),
                       "specular_exponent": 0,
                       "reflectivity": 0,
                       "transparency": 0,
                       "refractive_index": 0 ] )
}


def scene_at(now)
{
  var camera = Cameras.perspective( [ "eye": pos(0, 5, 5),
                                      "look_at": pos(0, 0, 0),
                                      "up": vec(0, 1, 0),
                                      "distance": 1,
                                      "aspect_ratio": 1 ] )

  var primitives = []

  primitives.push_back(group(1, decorate(material(Colors.red()),
                                                  translate(Animations.circular(pos(0,0,2),
                                                                                pos(0,0,0),
                                                                                vec(0,1,0),
                                                                                interval(degrees(0), degrees(360)),
                                                                                seconds(5))[now] - pos(0,0,0),
                                                            sphere()))))
  primitives.push_back(group(2, decorate(material(Colors.green()),
                                                  translate(Animations.circular(pos(0,0,2),
                                                                                pos(0,0,0),
                                                                                vec(0,1,0),
                                                                                interval(degrees(120), degrees(480)),
                                                                                seconds(5))[now] - pos(0,0,0),
                                                            sphere()))))
  primitives.push_back(group(3, decorate(material(Colors.blue()),
                                                  translate(Animations.circular(pos(0,0,2),
                                                                                pos(0,0,0),
                                                                                vec(0,1,0),
                                                                                interval(degrees(240), degrees(360+240)),
                                                                                seconds(5))[now] - pos(0,0,0),
                                                            sphere()))))

  primitives.push_back(decorate(material(Colors.white()), translate(vec(0,-5,0), xz_plane())))

  var root        = union(primitives)
  var lights      = [ Lights.omnidirectional( pos(0, 5, 0), Colors.white() ) ]

  create_scene(camera, root, lights)
}


var raytracer   = Raytracers.v6()

var renderer1   = Renderers.cartoon( [ "width": 500,
                                       "height": 500,
                                       "sampler": Samplers.multijittered(2),
                                       "ray_tracer": raytracer,
                                       "shade_count": 5 ] )

var renderer2   = Renderers.edge( [ "width": 500,
                                    "height": 500,
                                    "sampler": Samplers.multijittered(2),
                                    "ray_tracer": raytracer,
                                    "stroke_thickness": 0.0075,
                                    "stroke_color": Colors.black(),
                                    "background_color": Colors.white() ] )

var renderer = Renderers.masking(renderer1, renderer2);

pipeline( scene_animation(scene_at, seconds(5)),
          [ Pipeline.animation(30),
            Pipeline.renderer(renderer),
            Pipeline.studio() ] )