29 Jun 2013

Metal Scratches

If you take a nicely reflecting steal spoon, which has a lot of fine scratches, you can observe a rather interesting effect when reflecting a bright source. It seems as you can always just see those scratches, which lie tangential to the specular highlight. For example, if the reflection of a bright light is in the middle of the spoon's round, it seems as all scratches run circularly around the bright spot. But if you point a light from the side and very flat to the surface, it seems as all scratches run just straight. Most interesting is the fact, that it is very hard to spot the other scratches, they really seem to vanish.

It was interesting to work out a setup which can reproduce this effect. Below is the result. Some images will follow.


Movie: Metal Scratches on Spoon:

 Some images where the effect is more subtle compared to the animation:



Last modified on Sunday, 30 June 2013 19:06

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