Gaps appear when a mesh is badly built. Imagine you have a straight 3D line with 3 points on it : A-B-C. If you have a triangle having a side A-B, and another having a side A-C, then you will have a gap ! What you must do to fix that is split your second triangle into A-B and B-C.
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Visible tiny gap between tangent edges
in Building and Texturing Forum
Posted
Gaps appear when a mesh is badly built. Imagine you have a straight 3D line with 3 points on it : A-B-C. If you have a triangle having a side A-B, and another having a side A-C, then you will have a gap ! What you must do to fix that is split your second triangle into A-B and B-C.