MedicalVisualization
OpenGL Redbook
Billboards With 2D Texturing
‹ Texture Filtering | ● | 3D Textures ›
A common example of simple 2D texturing are the so called bill boards: proxy-geometry for complex geometry.

Hint: Alpha test is used to discard transparent fragments of the bill board.
‹ Texture Filtering | ● | 3D Textures ›