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Turning off shadows for a certain surface - SOLVED

HeraHera Posts: 1,955
edited May 2013 in Technical Help (nuts n bolts)

Hi!

I have a candelabra with candles in and I want the candelabra to cast shadows but naturally not the flame, since it's fire - a light source. I remember seeing somewhere how you could tweak a bit to make it possible to turn off casting shadows for just a single surface of an object, but I cannot remember how it was done.

Anyone knows?

Post edited by Hera on

Comments

  • Richard HaseltineRichard Haseltine Posts: 99,474
    edited December 1969

    Several options:

    one, load two copies of the item, make one cast shadows and set the flames to 0% opacity, make the other not cast shadows and set everything but the flames to 0% opacity.

    two, use a shader - uberSurface 2 has a cast shadows option, or you can use Shader Mixer with a Ray Type Test brick to detect Transmission rays and set the opacity to 0 for those.

    edit the mesh to split the flames into separate objects or bones.

    I usually use one of the first two, depending on how complex the mesh is.

  • HeraHera Posts: 1,955
    edited December 1969

    Thanks a lot for the tips!

    I ended up making it even simpler - two renders, one with casting shadows and one without and then postworking them together in Photostop :)

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