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How would you create a sub object light source?
show user profile  Spear Chuck
I would like to use the inside perimeter of a modeled gauge as a light source to illuminate the instrument. How would I use the inside wall as the light source?
read 452 times
1/12/2015 1:13:15 PM (last edit: 1/12/2015 1:13:15 PM)
show user profile  Nik Clark
A material with self=illumination?

read 451 times
1/12/2015 1:15:16 PM (last edit: 1/12/2015 1:15:16 PM)
show user profile  mike_renouf
I use the Vray light material in a multisubobject material when doing suspended ceilings all the time. This works fine, as long as you're not using it as a "Direct" light. Vray doesn't allow multi-subobject materials to emit direct light. Apparently they're going to fix that in future updates, but I'm not holding my breath.

I guess you could do the same in most render engines.

read 445 times
1/12/2015 1:30:36 PM (last edit: 1/12/2015 1:31:15 PM)
show user profile  Spear Chuck
Sorry, I took my dog for a walk.

I'm using Mental ray.

I'll try the self illumination on a non-renderable tube?
read 436 times
1/12/2015 1:51:45 PM (last edit: 1/12/2015 1:54:44 PM)
show user profile  Nik Clark
A&D material, there's a checkbox to use FG for self illumination, or something like that.

read 431 times
1/12/2015 3:08:51 PM (last edit: 1/12/2015 3:08:51 PM)
show user profile  Mr_Stabby
the checkbox makes the self illumination also illuminate other things provided high enough FG settings, otherwise it just illuminates that material. Not really required for a gauge though. Honestly you'd get more realistic looking and faster rendering results by just putting a little point light in the gauge. Always prefer actual lights in MR, the self illumination effect has rather poor performance.

read 410 times
1/12/2015 8:11:36 PM (last edit: 1/12/2015 8:15:21 PM)
show user profile  Spear Chuck
I remember watching a tutorial on lighting a car where a box was assigned a light material, what was that?

I'll try to find it...
read 401 times
1/12/2015 9:35:17 PM (last edit: 1/12/2015 9:35:59 PM)
show user profile  FX
I avoid Vray light material like the plague, due to render issues... mainly blotchies, and I'm never happy with the results...too lazy to figure out why, so I just use vray mesh light instead.
Clone your sub-object and turn it into a "proper" light.
read 385 times
1/13/2015 1:36:42 AM (last edit: 1/13/2015 1:36:42 AM)
show user profile  mike_renouf
@ FX

I guess I should give your method a try. I've had some scenes with 100 or so ceiling luminaires (big open plan offices) so avoiding sampling of lights seemed like the way to go, but I should find out if it really is that big an issue.

read 372 times
1/13/2015 8:35:24 AM (last edit: 1/13/2015 8:35:24 AM)
show user profile  FX
Yeah that's the reason I reach for vray lightmtl, I've never tried mesh light on such a big scale ...could be the solution.

read 369 times
1/13/2015 11:01:37 AM (last edit: 1/13/2015 11:01:37 AM)
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