Forum Moderators: TheBryster
Bryce F.A.Q (Last Updated: 2025 Jan 23 6:01 pm)
Interesting effects, so what sort of set up are you using in a scene to test these?
Could you let us in on what is or isn't working as well as you'd like and what you think might improve things?
What settings are you using in the IBL Lab?
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My general IBL /sky lab settings are as described earlier:
Usually the sunlight is disabled, and no other lights are in the scene. The IBL settings, usually:
Quality: 256 (about half)
Intesity: 5-15, (depending on how bright the image is to start with)
HDRI effect: 100
I am not using any reflective objects in my tests; these just show the pixelation of the HDRI far too much... and my focus was more on the effects of these colors on non-reflective surfaces. So the objects in my scene are all flat white diffuse color...from the 'Simple' category of the materials.
Most of my finished renders tend to be Poser people, rendered out in Bryce, so unless they are wearing or using glossy metal armor, the lighting information I need is more oriented to how these colors will look on skin tones, or leather/cloth/etc. What I've found is that the non-glossy/ matte surfaces will 'blend' the IBL image's colors into a smooth gradation. This smooth gradation can give me the effect I previously had to get by adding a whole bunch of colored lights...which slows down the render times. Now, with just the IBL, and maybe either the sun, or one added light for shadows, I can get the same results for much less work.
"Is this faster then using True ambience.?"
shrug I haven't got a clue, Vile. I haven't done any investigations into the comparative uses of TA vs. hdri. This was purely an exercise in self-created hdri applications. There are so many things about Bryce I still don't know after all these years playing in my fave program. My to-do list is already a mile long, and it grows daily.
Retaliation for that hypnotic staring green eye of yours, that's all! grin
But, in terms of a thought-experiment, it would seems that the two functions would do essentially the same thing, but, for True Ambience you would actually need to have the objects in the scene to create the ambient light, whereas with the lighting from the hdri images, you could 'fake it', thus saving yourself some mesh weight in the scene......
Just a guess....the hypothesis would have to be tested.
IBL and TA do entirely different thigns.
IBL simulates light cast by a dome around the scene, and doesnt include any calculations to attempt to estimate how light bounces off objects.
TA simulates indirect lighting throughout the entire scene, not just the sky, but other objects in it too, including an estimation of bounced light. Actually you can even control the amount of bounces with the ray depth.
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While these images can do the job, I wouldn't call them 100% successful. But that's the whole point of experimenting.
I've realized doing these, that if you want a clear image to use as a backdrop, or are using highly reflective materials, then it's best to use one of the high-res images available on the web. But if your goal is to provide 'mood-lighting', then one of these types of simpler color 'splotch' images will do the trick nicely. It all depends on what your goal is for your render.
RosemaryR
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