View source for Google Filament

Notes on using [https://github.com/google/filament Filament], the rendering engine for many Google applications.

Note that Filament is not a replacement for Unity or Godot.

==Types==


==Materials==
In filament, shaders are written as materials.
The documentation for materials is available at https://google.github.io/filament/Materials.html

===Vertex shader===
Unlike standard OpenGL shaders, you cannot output arbitrary positions in the vertex shader.

You can:
1. Modify the world position of the vertices.
2. Send ''interpolants'', aka varyings, to the pixel shader.
3. Use a custom 4x4 matrix to transform coordinates from local to clip space.

===Fragment shader===
The fragment shader expects the output to be in premultiplied alpha.