   RenderMonkey HLSL Billboard
  HiCan somebody help me explain how billboarding is working in Rendermonkey's sample say FireParticleSystem.   // Billboard the quads.   // The view matrix gives us our right and up vectors.   pos += particleSize* (Pos.x * view_matrix[0] + Pos.y * view_matrix[1]);How does this do billboarding?Why is Pos.x is being multiplied with view_matrix[0](right vector)?similarlyWhy is Pos.y is being multiplied with view_matrix[1](up vector)?NeHe 19 says...look = right x up;But the sample's billboarding does not look like this at all!What am i missing here?Thanks in Advance.[Edited by - Sa77 on September 24, 2006 11:09:12 PM]