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I am trying to create a 3D model of a Penrose triangle

penrose triangle

different angle of a 3D Penrose triangle different angle

I am currently following the obvious path which is 3 rectangles with lowered edges at the ends to make them fit with the rest. But as you can see in the second image, the rectangles are rotated/bent on their long axis. How can that be achieved on Blender?

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  • $\begingroup$ What about rotating the face on one end? $\endgroup$
    – gandalf3
    Jan 25, 2015 at 21:48

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The key point to an optical illusion is that it is an "optical illusion" and you usually can't model them accurately. You should create a model that looks right from the camera, but may not look right as you rotate around the model.

For the triangle you are doing look at this

A tip that can help is to use the Blender Internal for rendering. Under the Options panel of the material there is an Invert Z Depth setting. I haven't tried doing the same in cycles.

This scene -

enter image description here

renders as this -

enter image description here

I believe this was created by Ton back in blender 1.70, you get a copy of the file here

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