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SophiaWang

Exclude some meshes from light?

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Is it possible to exclude some meshes of an object from light, but the rest of the meshes of the object can still receive light?

For example, I have a box, I only want the top of the box to receive light, the rest of the box is excluded from the light. (without separating surfaces into several objects!)

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8 hours ago, SophiaWang said:

Is it possible to exclude some meshes of an object from light, but the rest of the meshes of the object can still receive light?

No, not unless you can do it with textures. Cinema does let you exclude whole models from lighting etc, but not parts of objects.

 

CBR

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  • Thank you very much Imperial Archon. I was just hoping maybe there is a way to do it that I just didn't know.

    Do you know if it's possible to give meshes of an object to a layer or a take? like, sign some parts of an object to a layer A (take A), some parts of the object to layer B (take B) to render these parts out separately. 

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    Definitely not to layers, but less sure about takes - don't use them much myself. I was thinking you could hide polygons of a mesh in one take, and then the inverse of that in another, but you'd have to test to see if that worked...

     

    CBR

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  • I did a test on takes. Unfortunately, Same as Layers, hide polygons doesn't work on takes either. So far, I'm stuck here.@_@, T_T

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    Hmmm. This is not something people usually want to do, and it would seem to defy the laws of physics on which lighting and rendering in Cinema are based, so I am not really surprised we are struggling to think of ways around this.

     

    I think we need more detail about the final look you are aiming for, and why. We could, for example, put a black luminant material on just the polys we don't want to catch light, but that will have the effect of simply making those surfaces not seen in render (except when occluding the parts that are lit). My only other suggestion would be doing 2 separate renders (with alternate sets of polys hidden / showing, and combining them in post.

     

    CBR

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  • The project I was doing is a fully rigged woman model with weight completely done. What I tried to achieve is to make the inside mouth not receive light. 

    The model is one editable polygon. I don't want to tear it apart into pieces to render it separately coz it would break the weight. So I was looking for a solution like maybe sign different polygons to different layer to render it separately (but that was a failure lol)

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    Ah I see. What about putting a negative light in her mouth ? This is an old technique for sucking light out of areas we don't want it...

    So literally, pop an omni in there, and give it negative brightness.

     

    CBR

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