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I'm having issues with getting a water polygon imported through blender-osm add-on to properly shrink-wrap on the corresponding terrain.

Here is what the artifact looks like (the black moiré-like effect):

enter image description here

Here is what the polygon looks like when it isn't shrinkwraped:

enter image description here

Any idea on how to deal with these problems when shrink-wrapping in general (or with the Blender-osm add-on in particular)?

Lucien S.
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1 Answers1

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Shrinkwrap will move the faces of an object on top of the faces of the target object, making them overlap or occupy the same space. When that happens you get Z-fighting errors. The program cannot decide which surface to render. (For a detailed explanation read https://en.wikipedia.org/wiki/Z-fighting).

To avoid it make the shrinkrwapped surface be above or below the target surface. Use the Offset option within the modifier.

Additional info in this related link: How do I avoid rendering glitches from overlapping faces?