Blender VAT (Vertex Animation Texture)

requirement

• Blender
• Python3
  • imageio (with freeimage plugin)
    • MacOS brew install freeimage
    • Windows https://imageio.readthedocs.io/en/v2.5.0/format_exr-fi.html
  • numpy
• Unity [URP]

Usage

• Resource Generation
  1. Install python3 and python requirements wrote in requirements.txt
  2. Modify build_vat.py set data_path to your obj models path.
  3. Create output folder in the same directory with build_vat.py
  4. Export blender animation sequences in wavefront obj format into output folder. (DO NOT EXPORT MATERIALS).
  5. Run ./build_vat.py
  6. Copy unity/create_vat_mesh.cs to unity Assets/Editor folder (create it if you don't have it)
• Unity Asset
  1. Select vat_vertex_tex.exr and Click Unity Menu VAT/Create VAT Mesh create vat mesh for current vat textures.
  2. Create Unity Material with shader/VATFluid.shader, attach vat textures to spercific material slot.
  3. Create any unity 3D GameObject and replace mesh with generated vat mesh.
  4. Set material to generated material.
  5. Done

and generated vat textures to render VAT mesh in unity.

Realtime Rendering Result in Unity

Caution

Because vat texture is data texture. So vat texture import setting must set in specific form.

• [IMPORTANT] Compression None.
• sRGB set to false.
• FilterMode set to Point Filter.
• Generate Mip Maps set to false.
• Max Size set to the same size as vat textures.
• Alpha Source set to None