   depth testing
  Hey;I have a project which does this so far:1) draws a height mapped terrain2) disables depth testing, draws a "road" (a single quad), and re-enables depth testing3) draws some quads to test depth testingEverything works as expected here: the road appears above the terrain, and the quads intersect the terrain as if there were no road overlapping it; however, I'd like the road to change the depth buffer as if depth testing wasn't ever disabled, but still always appear above the terrain.How might I go about this?   
  solution:rather than disable the depth test, I changed the depth function to GL_ALWAYSworks perfectly :)   