Render To Texture

Render To Texture (RTT) is a method to capture a view of the game and turn it into an image.

RTT is commonly used for reflective water in a game. A camera is placed below the water surface, looking up. The image it captures is then textured onto the water surface, looking like a live reflection.

This is also a 3ds Max utility named Render To Texture, which is used to "bake" textures from one geometry to another, for example to create Normal maps.