RMA

RMA stands for Roughness + Metallic + Ambient occlusion, which are packed into the red, green, and blue channels of a bitmap.

These maps are used with Physically Based Rendering.

The process of combining different maps into RGB channels is called channel packing.

Tools

 * Photoshop alpha channels
 * Gimp alpha channels
 * Channel Shuffle

More Information

 * Ambient occlusion map
 * ChannelPacking
 * MultiTexture
 * Normal Map Compression
 * PBR
 * Roughness map
 * Metallic map
 * Shaders
 * Texture atlas
 * TextureCoordinates