Spheres¶

Spheres example script:

Geometry: geometry.Sphere: radius = 0.5, outline_width = 0.1
- material: roughness = 0.8, specular = 0.2, metal = 0, spec_trans = 0
- outline_material: solid = 1, color = (0,0,0)
- positions: output of a HOOMD simulation
Lighting: light.cloudy
Rendered with: tracer.Path: samples = 256, light_samples = 16

Source code

# Copyright (c) 2016-2025 The Regents of the University of Michigan
# Part of fresnel, released under the BSD 3-Clause License.

"""Sphere example scene."""

import fresnel
import numpy
import PIL
import sys
import os

data = numpy.load("spheres.npz")

scene = fresnel.Scene()
scene.lights = fresnel.light.cloudy()

geometry = fresnel.geometry.Sphere(
    scene, position=data["position"], radius=0.5, outline_width=0.1
)

geometry.material = fresnel.material.Material(
    color=fresnel.color.linear([0.1, 0.8, 0.1]), roughness=0.8, specular=0.2
)

scene.camera = fresnel.camera.Orthographic.fit(scene)

if "CI" in os.environ:
    samples = 1
else:
    samples = 64

out = fresnel.pathtrace(scene, samples=samples, light_samples=32, w=580, h=580)
PIL.Image.fromarray(out[:], mode="RGBA").save("sphere.png")

if len(sys.argv) > 1 and sys.argv[1] == "hires":
    out = fresnel.pathtrace(scene, samples=256, light_samples=16, w=1380, h=1380)
    PIL.Image.fromarray(out[:], mode="RGBA").save("sphere-hires.png")

Author

Joshua A. Anderson