Unity Game Optimization - Third Edition

Adjusting compression rates for nonsquare textures

Texture files are normally stored in a square, power-of-two format, meaning that their height and width are equal in length, and its size is a power of two—for example, some typical sizes are 256 x 256 pixels, 512 x 512, and 1024 x 1024, and so on.

It is possible to provide rectangular power-of-two textures (such as 256 x 512) or those with a non-power-of-two format (such as 192 x 192), but creating textures such as these is not recommended. Some GPUs require square texture formats, so Unity will compensate by automatically expanding the texture to include additional empty space in order to fit the form factor that the GPU expects, which will result in additional memory bandwidth costs, pushing ...