9/19/2023 0 Comments Wolfenstein 3d maps floor 6![]() Rd = cosWeightedRandomHemisphereDirection(recNormal) varying vec3 vWorldPos įor ( int i= 0 ithis experience, I knew that the grid-based level design of Wolfenstein could also be used as a fast and simple acceleration structure and that ray tracing through this structure would be very fast. In 2013, I created a single WebGL fragment shader on Shadertoy that renders a Wolfenstein-like level and procedurally creates all textures needed. I decided to use a Wolfenstein 3D level for this demo. This makes it hard to pre-calculate and use BVHâs in WebGL1 shaders. Normally a bounding volume hierarchy (BVH) would be used as an acceleration structure to speed up the ray trace process, but my decision to make this project in WebGL1 didnât help here: in WebGL1 it is not possible to upload 16-bit data to a texture, and you cannot use binary operations in a shader. The problem with having a more complex environment is that I still had to be able to ray-trace the scene in real-time. A brute force intersection loop where the ray is tested with all cubes and spheres in the scene is still fast enough to get a program that runs fine in real-time.Īfter creating the prototype, I wanted to make something more complex by having more geometry and adding many lights to the scene. This makes the ray tracing code in the shader straightforward. There is only one light, and only a few spheres and cubes are rendered. The light source is occluded by the brown wall on the left of the image. In the image to the right, you can see how all spheres are correctly lit by indirect lighting only (the light rays bounce on a wall behind the camera). The shader used to rasterize the geometry calculates direct lighting and casts random rays from the surface of the rendered geometry to collect the indirect light reflection due to non-shiny surfaces (Diffuse GI) using a ray tracer. The prototype is based on a forward renderer that draws all the geometry in the scene. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |