Is it possible to stop casting shadow only for an element?

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Old 01 January 2013   #1
Question Is it possible to stop casting shadow only for an element?

Hi,
I have a 22 parts animated model with point cache modifier
so its all 1 edit poly model with 22 elements and I need the
Eye transparent part to stop casting shadows so light can go inside
for a much more natural look..
but removing the V from "cast shadow" to the element..
influences the whole model.. any ideas ?
(maybe changes to the transparent material itself..?)
thanks,
Elad

Last edited by elado : 01 January 2013 at 01:12 PM. Reason: idea
 
Old 01 January 2013   #2
I'm afraid you'lll need to detach the element, then un-check cast shadows.
 
Old 01 January 2013   #3
thanks..I tried.. but it destroyed the point cache modifier..
 
Old 01 January 2013   #4
Is it possible to put an edit poly on top and make a copy of the mesh, one where in the new edit poly you delete everything but the eye and in the copy you delete everything but the eye?
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Old 01 January 2013   #5
What renderer are you uing?

Just apply different material id's to the element.

You can use Blur's free RayShadTrans material (set trans. color swatch to white).
This only works with the scanline renderer and vray, not mental ray.

Using vray, you can use the VrayOverrideMtl

Last edited by CHRiTTeR : 01 January 2013 at 05:25 PM.
 
Old 01 January 2013   #6
Thanks for your comments! ,Im using Vray,
darthviper107, Ive tried that now and any change in the cache is destroying the animation itself...

CHRiTTeR, thanks for the suggestion..since Im using vray I tried creating the override material as youve suggested, but cant find how to eliminate casting shadow with it..any clue will be appreciated ..

(I as not sure I cant use the other material you suggested since Im sending the final movie to a render farm..I think it might create a problem rendering a non-native material..so I rather solve this with the tools I have..)

thanks!
Elad
 
Old 01 January 2013   #7
Originally Posted by elado: Thanks for your comments! ,Im using Vray,
darthviper107, Ive tried that now and any change in the cache is destroying the animation itself...

CHRiTTeR, thanks for the suggestion..since Im using vray I tried creating the override material as youve suggested, but cant find how to eliminate casting shadow with it..any clue will be appreciated ..

(I as not sure I cant use the other material you suggested since Im sending the final movie to a render farm..I think it might create a problem rendering a non-native material..so I rather solve this with the tools I have..)

thanks!
Elad


Ok,

Apply a different material id to the element.

Now in the multi/sub material; apply a VrayOverrideMtl to the id that needs to have transparent (no) shadows.
In the base mtl you set up a material (or instance/copy whatever) to how you want the element to look.

In the shadow mtl you set a basic vraymtl. In this basic vraymtl apply a black map in its opacity slot.

This should work.

Last edited by CHRiTTeR : 01 January 2013 at 05:34 PM.
 
Old 01 January 2013   #8
Thumbs up

Thank you CHRiTTeR!
it worked perfectly and its a useful tip
Ill remember for future..
have a great weekend everyone
Elad
 
Old 01 January 2013   #9
Glad i could help.

Great weekend to you too!
 
Old 01 January 2013   #10
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