View Full Version : Trouble with chanlum
Spearhead 06-18-2003, 08:30 PM I got some trouble with the chanlum channel shader. I have made a cloth like material using chanlum in the luminance channel. I get patches where the material isnt showing and my guess its got to do with the lighting. In the image i have only a sun object.
Can this be solved so that the material is shown all over the object? Is it the light settings or is it something i have wrong in the chanlum- texturetag or material settings?
grateful for assistance. :p
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Kotayus
06-18-2003, 08:59 PM
well, you must have shadows cast for it to work properly. I have never experimented with hard shadows (as i know that the sun object uses hard shadows) I have always experimented with soft shadows, so maybe put a wide angle, mid brightness (maybe 40-50%) round spot with a soft shadow next to the object you want it on? Just an idea.
Perhaps some of the info on my site will help you?
www.metafex.net/cinefex/tutorials/
Its the first link i belive.
Hope i was of some help.
Oh..sometimes i have yielded better results by setting the lum channel to multiply
Spearhead
06-18-2003, 09:07 PM
Originally posted by Kotayus
well, you must have shadows cast for it to work properly. I have never experimented with hard shadows (as i know that the sun object uses hard shadows) I have always experimented with soft shadows, so maybe put a wide angle, mid brightness (maybe 40-50%) round spot with a soft shadow next to the object you want it on? Just an idea.
Perhaps some of the info on my site will help you?
www.metafex.net/cinefex/tutorials/
Its the first link i belive.
Hope i was of some help.
Oh..sometimes i have yielded better results by setting the lum channel to multiply
yes it helped somewhat to set to soft shadows for the sun and changing to multiply. the problem vanished after reducing the mix value below 50.
tx for the fast answer and tx for a great plugin.
one thing though, sometimes when ive experimented with different settings back and forth with the chanlum cinema completely locks and goes really heavy on the system. I have to kille c4d process to lock up the resources again. Is this a known isue or some fault on my system?
Kotayus
06-18-2003, 09:15 PM
Originally posted by Spearhead
tx for the fast answer and tx for a great plugin.
one thing though, sometimes when ive experimented with different settings back and forth with the chanlum cinema completely locks and goes really heavy on the system. I have to kille c4d process to lock up the resources again. Is this a known isue or some fault on my system?
NP, but its not my plugin :thumbsup:
I have noticed the higher the settings...the longer it takes to render the mat...and i have had it lock up a couple times.
Issues ive found are: in area mode, if you have high samples it makes render times long (as any high sample does) and initial offset seems to bump it up. The lock ups ive experienced are when i am adding bump to the material (if its a high bump) and with transparencys sometimes...im not really sure what causes it
Glad i could be of help.
Spearhead
06-18-2003, 09:21 PM
Originally posted by Kotayus
NP, but its not my plugin :thumbsup:
I have noticed the higher the settings...the longer it takes to render the mat...and i have had it lock up a couple times.
Issues ive found are: in area mode, if you have high samples it makes render times long (as any high sample does) and initial offset seems to bump it up. The lock ups ive experienced are when i am adding bump to the material (if its a high bump) and with transparencys sometimes...im not really sure what causes it
Glad i could be of help.
ah ok thats what causes it then. I have a bhodinut 3dnoise with rather large number of small noise in the bump channel. propably goes heavy on the algorithms and eating heavy chunks of RAM and cramming it all in the cpu all at once ;)
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