Strange artifacts in radiosity rendering

Saturn · April 5th, 2005

Hey everyone. I am doing a project using viz 2005 radiosity and i am getting some strange artifacts where two objects are joinging. I model in autocad and file link to viz. It is hapening in strange places as well. I am using daylight system and about 30 omni lights (photmetric). Here are some images showing this.

Solution quality: 85%
Refinements vary between 10 to 25
Filtering: 3
Mesh varies

Thanks in advance.

oluv · April 6th, 2005

do your walls join seemlessly?

have a look at the image, you should avoid connections like the second one, which will produce shadow- as well as light-leaks with a radiosity method.

if you render with regather the leaks should be gone though. but rendering takes much longer.

Woody · April 6th, 2005

If you're using shadow map shadows, try uping the size from the default 512 to something bigger. Try putting a plane above your internals to help block out light leaks.

Hope that helps.

Saturn · April 6th, 2005

Thanks guys, I will give it a try.

Jennifer · April 16th, 2005

Yes, make sure your model is seamless, very important. You can also try enabling "Regather Indirect Illumination" to clean up artifacts. This can slow things up quite a bit at render time, as VIZ recalulates the indirect light for each pixel. This can help with scenes that are not subdivided to a high degree.

April 6th, 2005	#3 (permalink)
Woody Senior Member Join Date: Oct 2004 Location: Cheshire Age: 31 Posts: 118 Name: Mark Woodard	Re: Strange artifacts in radiosity rendering If you're using shadow map shadows, try uping the size from the default 512 to something bigger. Try putting a plane above your internals to help block out light leaks. Hope that helps.

April 6th, 2005	#4 (permalink)
Saturn Senior Member Join Date: Dec 2003 Location: Jacksonville Age: 29 Posts: 480 Name: Jason Matthews	Re: Strange artifacts in radiosity rendering Thanks guys, I will give it a try. __________________ Jason Matthews

April 16th, 2005	#5 (permalink)
Jennifer Senior Member Join Date: Jul 2003 Location: Northern Illinois Posts: 166 Name: Jennifer O'Connor	Re: Strange artifacts in radiosity rendering Yes, make sure your model is seamless, very important. You can also try enabling "Regather Indirect Illumination" to clean up artifacts. This can slow things up quite a bit at render time, as VIZ recalulates the indirect light for each pixel. This can help with scenes that are not subdivided to a high degree. __________________ Jenni www.4DA-inc.com Chicago 3ds Max / Maya UG www.max3ds.com Render UG www.Render-Art.com

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