   octree in raycasting (volume rendering)
  Hello,i want to implement an octree in my volume renderer for emptyspace leaping. i know how to build that octree and in the mostbooks about volume rendering , octree is a recommended data structure. my question is, how to use this octree then for rendering? the volume is uploaded to the gpu in a 3d texture.what to do next ? i have absolutely no clue. Someone therewho can help me please ?regards,c-mos   