When compiling using Tool the following warning message appears:
### WARNING found nearly coplanar surfaces (red and green)
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As the message indicates, there are faces or triangles that are coplanar.
This error is commonly caused by the creation of a surface (such as a wall) at an angle. This surface tends to have many surfaces or triangles in its construction that are side by side.
Make the surfaces planar or adjust the faces (move vertices) such that there is more variation in the surface (the surface is no longer flat or planar or nearly flat or planar ).
When compiling using Tool the following error message appears:
### ERROR found z buffered triangles (red).
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This problem is typically caused by the overlapping or interpenetration of geometry or faces.
If not fixed, this error can lead to rendering or visual errors and anomalies for the offending faces.
Both of these can either cause glitches in Sapien where it will refuse to do radiosity, and they will also give you artifacts (graphic anomaly's) in-game.
You should fix them unless they are well hidden; even then, it is good practice to fix them.