Downloadable computer graphics software; downloadable software for creating and editing images; downloadable software for adjusting lighting and shading in digital content; downloadable software for enhancing video display; downloadable software for rendering high-quality images and videos for use in the creation, production, and operation of 2D and 3D games, 2D and 3D interactive game and non-game worlds and virtual environments, and 2D and 3D animations; downloadable software for rendering high-quality images and videos for use in the creation, and production of multimedia applications and content; downloadable software for the creation of computer-generated imagery, graphics and content for use in game and non-game worlds, online universes, and metaverse environments; downloadable software for creating digital animation and special effects; downloadable software for lighting and shading; downloadable software for advanced graphics processing and visual computing; downloadable software for sampling primary and secondary shadow rays and continuation rays for purposes of creating photorealistic environments with physically accurate lighting; downloadable software for implementing direct light sampling in real-time rendering; downloadable software for rendering dynamic direct lighting and shadows from hundreds of shadowed lights on computers and video game consoles; downloadable screen space light sampling software; downloadable software for rendering high-quality images and video using shadowed lights; downloadable software for simulating actual light rays via soft shadowing; downloadable software for computing diffuse and specular lighting with ray tracing to create changing rendering for use in the creation, development, production, and operation of 2D and 3D games, 2D and 3D interactive game and non-game worlds and virtual environments, virtual reality, augmented reality, mixed reality and extended reality experiences, 2D and 3D animations, simulations and visualizations, and metaverse environments; downloadable software for computing diffuse and specular lighting with ray tracing to create changing rendering for use in the creation, and production of motion pictures, television programs, videos, animations, simulations, visualizations, and digital media; downloadable software for enhancing graphical and video display; downloadable software for simulating lighting interactions with complex geometry to add realistic lighting to digital content for use in the creation, development, production, and operation of 2D and 3D games, 2D and 3D interactive game and non-game worlds and virtual environments, virtual reality, augmented reality, mixed reality and extended reality experiences, 2D and 3D animations, simulations and visualizations, and visual and digital media content; downloadable software for use in video game development; downloadable software for use as a digital content editing tool; downloadable software for simulating and enabling diffuse and specular direct lighting for purposes of creating photorealistic virtual objects and environments; downloadable software for simulating how light reflects off and scatters from rough surfaces; downloadable software for simulating how light reflects off smooth surfaces; downloadable software for simulating and enabling realistic or stylized lighting effects in virtual environments and in game and non-game worlds; downloadable software for implementing stochastically sampled direct lighting to create lighting effects; downloadable software that uses stochastic sampling of direct light sources to create soft shadows, smooth transitions, and mimic realistic lighting behavior in scenes; downloadable software for using direct light sources to simulate realistic lighting effects; downloadable software for simulating shadowing created by area lights, for purposes of achieving realistic lighting effects in scenes including natural, diffuse shadows; downloadable software for simulating realistic light sources that cast smooth, gradual shadows; downloadable software for providing natural lighting transitions for complex scenes.