Billboard
Billboard is a quad orientated to face the camera. While the active camera in your scene is moving the billboard is orientated to face the camera. The billboards are useful to create indicators or making an impostor of your far mesh to reduce the geometry that the render needs to draw. A common use is to simulate far bushes or trees.
Types of billboards
Point Orientation
The billboard is oriented about his origin to always face the camera. With this type of billboarding, the object will always appear the same to the camera, however, it will be affected by perspective.
Axial orientation
The billboard is rotated about an axis to face towards the camera.
In this section
The following sections show how to create and use billboards in your scene.