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radiosity effects
Hi, I’m trying to set up a lighting rig for a house I’m modelling. I want to get it as realistic as possible and what I’ve done is put a parallel light outside the back of the house with volumetric lighting so it looks like sunlight is shining through the window. It looks fine and what I’ve done is turned on radiosity so as to light other rooms more realistically but when I do a render I get small scratches and strange patterns on the walls. They’re less noticeable if I turn up the luminance on the walls texture or if I reduce the accuracy. I’m using the camera animation mode as I intend to animate it. Has this happened to anybody else and if so can it be fixed?
Thanks a mil
Donal -
6 Replies
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Can you post a pic?
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Here it is:
http://www.pixellab3d.com/grab.jpg
I’ve made the effect deliberately worse so you can see what’s happening. The effect isn’t as bad when I lower the accuracy for some weird reason. You should be able to see the settings I’ve used too. Any suggestions?
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Yeah, that is bad! 🙂 It’s pretty tough to light an interior cleanly using only external lighting. I think you would have to increase your samples significantly–maybe to around 1000. I’d also use higher Min. samples–starting with 10 and going up from there. Max. will probably have to come up too. Of course all of this will lead to much longer render times. You can make things easier on yourself by cheating a little bit. Add some low-level omni lights inside to give the render engine more samples to work with.
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One more thing: if you do add some omnis inside you should be able to reduce your diffuse depth quite a bit (down to 2-4) which will lower your render times a lot.
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Thanks Adam, I’ll give it a go. I had low omni lights in there before but they didn’t really help. I’ll give them another try though. I’ve ordered radiosity for interiors from 3d fluff so hopefully that should point me in the right direction
Donal
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As Adam pointed out, turning up the Min/Max will help smooth out the artifacts immensely. With radiosity you’re looking at long render times anyway. The trade off is the added realism.
I would also recommend turning down Diffuse Depth to 3. Anything above 3 won’t add much to the realism or details and just dramatically increases your render times.
Good choice on getting the 3DFluff DVD on Radiosity. It’s quite detailed and informative.
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