Why can't you break your scene into passes? With the point cloud hidden in the "light map pass"?
Chris On 13 Aug, 2012, at 10:20 PM, "Rémi ARQUIER" <arqu...@gmail.com> wrote: > Hi list > > I would like to know if it is possible to exclude objects in the ligtmap > rendering stage. Specificaly I would like that some of ICE particle clouds > not be seen by object beeing sampled (for reflection rays and shadow rays for > example). > > I have tried combining a mip_rayswitch_stage plus a transparent shader for > the lightmapping rays on the particle material. It works, *but*, the presence > of the clouds considerably slow down the lightmap rendering stage since the > particles are still hit (by shadows and secondary rays and for nothing). A > "rendering lightmap visibilty flag" excluding the cloud for real would be > perfect, but doesn't seem to exist. > > Any idea ? > > I could write some custom MR shaders and custom plugins if necessary. > > Thank you for help > > Rémi
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