DESCRIPTION OF PROBLEM: ======================= Because of the coarse nature of SnapNormal(), planes that are 0.25 degrees away from being axial are "snapped" to be axial. The "normal epsilon" is a very small value by default, and cannot go much smaller (without running into limits of floating point numbers). The problem with SnapNormal() is that we compare the components of the normal that are near 1, instead of comaring the components that are near 0. This leads to a very coarse and inaccurate SnapNormal(). If you open the example map in Radiant, you can see that the red brick should touch the middle checkered brick at the edge. However, once this map is compiled, the edges are a significant distance apart. This is due to the coarse and inaccurate nature of SnapNormal(). Likewise, the green brick should be flush with the center tiled brick, but it's not.