I wanted to share something I came across while looking at models and textures from Borderlands 2. There is a 3D model called WreckedVan that is used all over the game. It comes with a 2048 diffuse map and a second packed mask texture. The size might seem large for 2012 but given that it was standard practice to give…
The uv squishing will just be a way to have an atlas and still pack the textures with something that uses the uv0 channel layout - ambient occlusion or something I expect Size wise, there are a few scenarios where 2 channels make sense but iirc it's usually more about quality then memory footprint (3channel bc1 is highly…