A simple tool for Unity which is useful for prefiltering environment cubemaps and save them with a mip-map chain filled with different values of roughness. At the moment it supports two different possible PBR BRDFs: Phong and GGX.
- Open the tool selecting Window/EnvMapEditor
- Set the desired parameters:
- Output_size: it's the power of two size of each cubemap face.
- Output_format: pixel format, usually ARGB32 for LDR images and ARGBFloat for HDR.
- Output_srgb: if the cubemap is linear or gamma corrected.
- Brdf: Phong or GGX.
- Start Alpha: for the Phong brdf, is the starting value of alpha (2048 is a good value).
- Alpha Mip Drop: how much alpha is decreased in each mip level (0.25 is a good value).
- Click Prefilter
- Choose a filename, must be a path starting from the Asset folder and with the
.assetextension e.g.Assets/Textures/Environment.asset - Save
- If you want to see the result, clicking on View, the skybox will be replaced with the prefiltered environment, with the slider you can change the showed mip level
This project is licensed under the MIT License - see the LICENSE