PBR Shader

Physically based HLSL shader

Apr 11, 2015

View shader source code

I created this shader to get a deeper understanding for how physically based rendering works.

Character model created by Joachim Häggström.

Features

Written in HLSL
Directional lights utilizing GGX distribution
Image-based lighting
Metallic/roughness workflow
Allows for overlapping and mirrored normal maps

Problems Encountered

I used ShaderTool to pipe all the data into the shader. While this allowed me to create the shader in a short time span, it also came with a few drawbacks, such as no support for HDR cubemaps and the fact that mipmaps are recomputed for DDS textures when they are loaded. This stopped me from using HDR cubemaps and pre-convolved GGX cubemaps that are synced between the authoring program (Knald Lys) and the shader.