This one was almost impossible to take a picture of so I better describe it instead. It's a rectangular sheet with cutoff corners and a raised center. It was really made as a ground mesh for a gravel patch on top of a prefectly flat surface - the raised center was to avoid texture flickering - but but it can be resized to a proper pyramid. It has smooth normals all over so it looks round with no sharp edges. That's why I had problems taking pictures of it - without a texture it just look like a white blotch.

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OPQ Pyramid 01S
Originally made as a ground mesh with only a slightly raised center, this pyramid has all smooth normals and soft edges and is UV mapped as a flat surface seen from above. https://www.kitely.com/market/product/5 ... yramid-01S