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excluding objects from caustics and back
show user profile  flyboy9999
i have a scene wich consists of 3 objects
each obj with a different glass color
they all have to cast caustics, allready set this up and working in Mental Ray.
I'm trying to animate them one at a time so it looks like :
obj1 lite up, the others are dark
then second obj and the third remains dark
and finnaly the third obj lighted up
now comes the tricky part
even when i exclude the 2 other obj. they are still lighted up
it's strange that when you enable caustics to objects with glass materials, they lite up even when you exclude them from lights

it's freaking me out (lol)

read 537 times
3/24/2009 9:22:30 AM (last edit: 3/24/2009 9:46:33 AM)
show user profile  Dejitarujin
Change the light to specifically shine only on the objects you want lit up. Either a light that moves to shine on the objects one at a time, or three appropriately placed lights with animated intensity.

Include/Exclude usually isn't used for that purpose.
Specialty: Non-organic modelling and effects.
Setup: 3D Studio 2010 with finalRender.
Rig: No, no I can't.
read 536 times
3/24/2009 9:50:35 AM (last edit: 3/24/2009 9:50:35 AM)
show user profile  mrgrotey
There is a recieve caustics tick box in the objects' properties window (mental ray tab) dont htink its animatable though.

read 529 times
3/24/2009 10:16:34 AM (last edit: 3/24/2009 10:16:34 AM)
show user profile  flyboy9999

That doesn't work my friend
Like said, when using glass materials check with "receive" caustics they are lite up no matter with or without a light

@Mr Grotey

I'm thinking about using 2 objects to do the light trick
first obj -> standard material with light then playing with opacity to make it dissapear and reveiling the glass material
read 493 times
3/25/2009 3:00:47 AM (last edit: 3/25/2009 3:00:47 AM)
show user profile  Dejitarujin
I don't understand how an object could be lit up without a light. I can see the Include/Exclude box failing, but with no light shining on it at all? I've never had the problem.

It might be the other objects. "Receive Caustics" should just be off - this determines whether the focused light reflected or refracted from other materials will hit it. "Generate Caustics" you want on. When you move something shiny around in the sun to make a light spot on the wall, the wall is receiving caustics, the shiny thing is generating them.

If the other objects aren't indirectly casting light (Global Illumination is off, right?), then that's a heck of a glitch.
Specialty: Non-organic modelling and effects.
Setup: 3D Studio 2010 with finalRender.
Rig: No, no I can't.
read 483 times
3/25/2009 10:42:01 AM (last edit: 3/25/2009 10:42:01 AM)
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