Posted 27 April 2012 - 06:35 PM
Posted 27 April 2012 - 07:15 PM
Or, saturation aside, it could be that your materials are just too bright in general and reflect too much light. You might experiment with darker materials and brighter light sources; this will reduce the relative intensity of bounce light. This is a very common mistake. It's a good idea to get a photographer's color card that has a set of gray levels on it, like this one. If you take this outside and hold it up against the wall of your shed to compare the colors, you might be surprised at how far from white the shed actually is!
Posted 27 April 2012 - 08:42 PM
I did some research in this when I wrote my bidirectional pathtracer (a fancier kind of raytracer), and it turns out white paper has a reflectivity of somewhere around 50%.
You'd expect that to be a medium grey, but it's not. It's all relative to how bright your lightsources are.
What I ended up doing was to specify all my colors like red = (1, 0.01, 0.01) * standardReflectiity, where "standardReflectivity" is 0.5. Notice that even my "red" has a tiny bit of green and blue, since no real material is 100% black or pure in the color.
This way I can divide the light power by the standard reflectivity to get the same exposure, in case I need to change it.
Posted 27 April 2012 - 08:53 PM
Posted 27 April 2012 - 10:22 PM
This says 60%, but it's just used as an example:
This says 87-93%, but doesn't explain how it was meassured:
Posted 28 April 2012 - 02:54 PM
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