error in rendering shadows

Forums Technical Discussion error in rendering shadows

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flyingc: Member; 160 posts; Joined:; Offline

Feb. 1, 2010 10:33 p.m.

i assign a shadow matte material to objects.
but mantra rendered some dirty speckle in the shadow .
as shown in the picture below

Edited by - Feb. 3, 2010 04:15:12

Attachments:
.JPG (12.0 KB)
lemon.rar (113.9 KB)


circusmonkey: Member; 2624 posts; Joined: Aug. 2006; Offline

Feb. 1, 2010 10:44 p.m.

Hi ,
I doubt the problem is caused by the shadow matte material. It is more like the quality of your shadow map. Do a test render using raytraced shadows and compare.

Gone fishing


flyingc: Member; 160 posts; Joined:; Offline

Feb. 2, 2010 1:05 a.m.

but the shadow type is already ray-raced shadows


Soothsayer: Member; 861 posts; Joined: Oct. 2008; Offline

Feb. 2, 2010 2:18 a.m.

Do you have depth of field in there? If yes, try upping the samples.

--
Jobless


circusmonkey: Member; 2624 posts; Joined: Aug. 2006; Offline

Feb. 2, 2010 4:15 p.m.

well if you have already tried to debug the scene it would help if you told everyone what you have tried. Or even better post up a scene showing the problem.

rob

Gone fishing


flyingc: Member; 160 posts; Joined:; Offline

Feb. 2, 2010 9:31 p.m.

there is no depth of field

the attachment is scene file.
but the thing changed very strange.

i add the parameter shown in the picture below for the light named top ,then the stains were disappear .but if delete this parameter , the error is no longer appear

but I don't know what is use of the parameter.

Edited by - Feb. 3, 2010 04:10:20

Attachments:
2.JPG (50.0 KB)
1.JPG (7.0 KB)
lemon.rar (113.9 KB)


Soothsayer: Member; 861 posts; Joined: Oct. 2008; Offline

Feb. 2, 2010 10:09 p.m.

Hm. Isn't that setting used to decouple shadows steps when using volumes?

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Jobless


flyingc: Member; 160 posts; Joined:; Offline

Feb. 2, 2010 10:21 p.m.

Soothsayer
Hm. Isn't that setting used to decouple shadows steps when using volumes?

Yes.i think so.
Pure Dumb Luck..so i feel it is very puzzled


Soothsayer: Member; 861 posts; Joined: Oct. 2008; Offline

Feb. 2, 2010 10:39 p.m.

If you can't post the original file, can you replicate the error in a simplified scene, (just a bumpy sphere). Then we could have a look at it?

--
Jobless


flyingc: Member; 160 posts; Joined:; Offline

Feb. 3, 2010 4:17 a.m.

sorry ,i forgot to attach scene file

the scene file is already in the first post.

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