Let's start with a simple PG, a SPS populated with transparent solid particles : http://playground.babylonjs.com/#EPBTB7#3 As you can notice when rotating the camera, because the SPS is a standard mesh and because transparent standard meshes don't sort their faces according to the camera position for performance reasons, the transparent particles are weirdly rendered from some points of view. This is unfortunately the expected behaviour when dealing with "auto-transparency" (transparency ap