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billtheia

Why am I getting blotchy areas in radiosity rendering?

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Can someone tell me why I'm getting blotchy areas in my radiosity rendering?

I've been working on using HDRI to render interiors and have finally gotten things pretty close but I get some blotchy areas around windows.

See attached pics

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Hello Bill:

Increasing the final gather accuracy will get rid of the splat artifacts from final gather. 10% is quite low, although it's a tradeoff for speed as always.

The detail size will get you tighter hugging of object boundaries, the accuracy value gets you smoother gradients of light.

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Saved my bacon once again, Dave. Thanks.

I only had to increase FG to 40% to get rid of the blotches. Only a small rendering time penalty. See new pic.

Still seems like a long time though, 22 mins for a 300 dpi, 8" x 6" image.

Anyway, thanks, Dave.

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Pretty.

How much of the render time is radiosity and how much is final gather? Since final gather adds another bounce on top of radiosity you should be able to get by with less radiosity energy %.

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Ray. I really WANT a new computer but need to wait a little while. Work is a bit slow right now (hence the time screwing around with rendering) AND I'm waiting to see what the new iMacs look like.

Dave. Thanks. It seemed like radiosity took about half of the render time and FG took half. Radiosity only used one of my processors and FG used both. I can mess around with energy %. Will I need to increase anything in FG to achieve the same image quality?

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Assuming that the light has bounced around a bit with the radiosity settings then the image quality should be largely determined by the final gather settings. Good luck!

Do you have the Visible Objects Only custom radiosity option turned on? That can speed up radiosity with interiors.

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Yes, I have Visible Objects Only checked.

I'll mess around a bit with settings and see if I can speed things up.

Thanks.

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OK, now I'm having a little bit of trouble with a transparent figure. It displays irregularly. See pic.

Any idea why this is happening?

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Bill

Sorry to divert the post momentarily but .....

New iMacs? Are they imminent? I have to upgrade as my lease runs out soon, but I haven't heard any whispers of a refreshed lineup.

Edited by D Wood

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Hello again Bill:

The recursion levels are listed in the Custom RW Options Render pane as Max Refractions and Max Reflections. The Refractions can be a high number like 64 and a decent number of reflections would be 3. Refractions doesn't affect speed much but reflections can if there is a lot of mirror surfaces bouncing off of each other.

Can you send me this cutout object? It looks like what you get when two polygons overlap exactly. It may also be the use of simple glass versus accurate glass.

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Thanks, Grant & Dave. That seems to have done the trick. I had to crank refractions up to 96 to get a smooth transparency, though.

Dave, I'm not using any reflection, only transparency and color.

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