add missing regression tests in last commit

[xonotic/netradiant.git] / regression_tests / q3map2 / coarse_snap_normal / README.txt

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+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.