Hey Briggsy, hope you are well!
I still have a hard time lighting warm local colors with cool light, if you ever had the time to demonstrate with a sphere or two I'd be in your debt (again). Understandably in many situations the local color of the sphere wouldn't be apparent in the slightest, but I suppose I am looking more for the situations where there is an obvious transition - perhaps multiple lightsource situations? Tricky business...
How's this look? I've left out the complexities of the reflected light since we're mainly looking at the colours. Here's the PSD file so you can see my logic, and tweak the hues to your heart's content:
You're a big man for trying to help us shmucks along. Thanks briggsy.
I've recently been hit with the colour bug. It's all I see anymore. Trying to observe light and colour closer than I ever have before, in hopes to apply it to my work. This thread will serve nicely in helping me along. I'll try to follow along.
Your site is a really good resource that saves alot of time.
I had some raytracing stuff I did yonks ago and played around with words that didn't make sense to me at the time. Now they do.
Just one question. On a dull ball without a specular hilight but with a diffuse effect of saturation change(Closer to the color of the light source).
Does the degree of change have to match the half light and full light direction of the sphere or does it follow the direction of reflecton the specular would have had? In otherwords to simply see the effect as a large dull specular?
I looked at my hand and the answer came to me. Because the texture is distributed (little bums on the back of the hand's skin texture) each bump has it's own specular almost like a bazillion little spheres stacked together, distributed across the surface of the hand. So the direction of the specular on each bump would confirm to reflection or specular rule but because they are distributed each of them would give a little specular over a wide area but thus only the planes with texture (little balls) in range will display the mixed or combined effect of saturation change:A little bit of light color blended with the object color and illumination of that color resulting in saturation change. Depending on the texture of the surface then the effect would be limited only to certain planes that has it's texture in range and that might not be the fully lit plane, and this effect could diminish down the length of a flat or constant plane as the relationship to the light and eye changes. Therefore the saturation painted on a lit side of a ball and the brightness change would not share the same relationship of degree into the same direction.
Last edited by George Abraham; February 5th, 2009 at 11:00 AM.
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Very glad if the site has been of help, everyone - just keep the questions/discussion/crits coming!
zaorr I not sure if I quite follow all of that but it sounds to me like you're on the right track. I'd expect to see an additive combination of the fuzzy specular reflection (the colour of the light source, and centred on the point where the specular on a polished sphere would be) and the diffuse reflection (the colour of the object, and reaching its maximum at the full light plane).