2012

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is a fast way to visualize how something will look. However, the edge created
where the two objects intersect can exhibit a rippled appearance.
In the following example, the edge appears rippled in the left image and much
cleaner after a Boolean union.
When edges do not appear to be as precise as you want, use Boolean operations
like union, intersect, and subtract. A much cleaner and precise edge is created
to better reflect the objects appearance.
Coplanar Faces
Faces that overlap and lie in the same plane, coplanar faces, can produce
ambiguous results, especially if the materials applied to the two faces differ.
In the following example, artifacts appear when faces occupy the same location.
Moving an object so its faces no longer occupy the same plane as another
object will fix this situation.
2244 | Chapter 46 Render 3D Objects for Realism