How would I go about texturing a surface, that is rectangular but not square (for example, 2:1) and the texture is supposed to fit exactly, considering the constraints you are mentioning here:
For optimal performance, texture images used in a definition should be square and with a size a power of two (128x128px, 256x256px, etc…). If textures don’t follow these requirements, they will be resized by our servers.
What exactly does resizing do to the texture? For example, had I created a texture of 512x256 pixes to match the ratio of the rectangular surface, would the texture be stretched along its small edges to 512x512?