Downloaded Models Render Too Dark Despite Same Material

The problem is that there are coincident faces

I isolated this building box

Run _What, which tells that there are 10 surfaces in the polysurface, even though only 5 is expected.

Then exploded it, deleted all double faces, rejoined. Now I can render it correctly (Raytraced uses the same engine as Rhino Render)

Here compared with the other houses that I did not give that same treatment:

To do all these in one go do the following:

  1. select all your houses
  2. _Explode
  3. _SelNone
  4. _SelDup
  5. delete selection
  6. _SelAll
  7. _Join

This should give you cleaned up houses that render correctly.

I’d keep everything still selected and at the end run _MergeAllCoplanarFaces, that will clean up your house models even more.

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Final

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