So the other day I wanted to add a quarter to a scene for scale. Decided to quickly model one. Looked for bumpmaps of coins on google image search, didn’t find any. Realized the only good-looking US coin asset was $60 on turbosquid. Maybe I was not going to do this so quickly.
I tried scanning in a coin, and using the scan to make a bumpmap, but that didn’t work at first. Then, I found this tutorial: http://zarria.net/nrmphoto/nrmphoto.html
My scanner appears to light the coin directionally (for some reason) so I used the technique described in the tutorial. I created a normal map then used Crazybump to generate a displacement map.
Anyway, after a few tries, you can see the results. It seems to work reasonably well, although I think if I were going to do it again, I would paint the coin with a flat color first. I think that glare from the shiny coin added some artifacts and reduced the detail in the scans.
I did the sides of the coins by hand, just displacement map and color.
The object is just a cylinder with glossy material and a displacement map.
Much easier than modeling the coin from scratch, anyway. If anyone is interested I will share the resulting textures and blend file.
Here is the normal map: http://i.imgur.com/vZsqu.png
Here is the displacement map I used in the blend file: http://i.imgur.com/ChpVv.png
here is the color map I used in the blend file: http://i.imgur.com/pK0qP.png
Sorry that I couldn’t pack the textures in the blend file, but they were too big.
Here is the .Blend file (uses cycles) quarter.blend (682 KB)