PureBasic - Billboard
Billboards are 3D planes (composed of 2 triangles) which always face the camera. Billboards are useful to quickly render a high number of elements, such as rain, snow, trees, vegetation or any particle-based effects. InitEngine3D() must be called successfully before using any billboard functions.
Billboards are added to billboard groups, which are collections of similarly sized and positioned billboards, so that they may be displayed.