I’m puzzled as to why my white shed on the green grass outside my house
is not greenich, but in a render, it is!!!?
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Perhaps the grass in your render is too saturated? I’ve noticed that
people tend to make their colors way more intense in renders than they
are in real life. It makes the image look “better” to some extent, but
it can produce side effects like this. :)
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
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!
Just like Reedbeta said, it’s easy to make the materials to bright.
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.
geon, do you happen to have the source for that 50% figure for white
paper? I’m skeptical. In my experience white paper seems to have an
albedo closer to 85-90%. Materials are often less bright than you’d
think, but white paper is still pretty bright. :)
Sorry, no. The little data I could find was not complete or consistent
This says 60%, but it’s just used as an example:
This says 87-93%, but doesn’t explain how it was meassured:
Right on Reedbeta. You’re right, my shed isn’t white like I thought. So
by mult all my materials by 0.5 and my lights by 2, it looks much more
natural and my shed is not green now, just a little bit, but barely.
Thank you all :)