light exclude??

[erkutacar]

hey ive got a funny problem with the light exclude option.. for some reason an object i exclude from shadow calculation still casts shadow eventhough i had also disabled "cast shadows" from object properties..

 

ive got a square frosted glass(25cm x 25cm x 1cm) in front of an IES light and i dont want the edges of the glass to cast shadow on the ceiling.. in fact i dont want the glass to cast any shadows at all.. even if i make it clear glass edges still cast shadows..

here is how it looks:

[ATTACH=CONFIG]44992[/ATTACH]

 

and this is with the light model layer disabled:

[ATTACH=CONFIG]44993[/ATTACH]

 

i want the light to look like this... the only way i can achieve this is to make glass IOR 1.. then its completely invisible

 

even with two spherical photometric lights turned on, it still has a crisp shadow..

[ATTACH=CONFIG]44994[/ATTACH]

Edited September 25, 2011 by erkutacar
adding an image

[AubreyM]

Do you have "affect Shadows" checked in the glass material?

[erkutacar]

there is no affect shadows in material inputs.. its arch&design material.. i use iray... refraction 1, refract glos 1, ior 1.52, thin-walled is checked...

[AubreyM]

Sorry, my bad. I assumed you were using vray. Boy do I feel dumb

I don't use Mental ray much anymore, I have not used the Arch & Design materials in a long time so I'm not going to be of much help.

[erkutacar]

but i dont think its a material issue.. when u disable an object from shadow casting, no matter what the material it should not cast shadows

[Scott Schroeder]

Select the glass object, go to the object properties of the geometry itself, and uncheck cast shadows.

 

Don't do this with lights and include/excludes or even worry about it in the material settings. Simply set the piece of geometry to not cast shadows.

 

IES lights in Mental Ray can be quite a pain with inclusion/exclusions.

[erkutacar]

i did that too

[erkutacar]

i even disabled the shadow of the light

[erkutacar]

hey scott.. i guess its a thing with iray.. coz u know physically its not possible ive tested the settings in a new scene again no result.. but then i switched to mental ray, and without doing any settings at all here is the result:

[ATTACH=CONFIG]44995[/ATTACH]

 

so what do u think?

[erkutacar]

yes i just checked, as i thought iray doesnt support any settings on light shadows or inclusion/exclusion and object shadow settings.. gotta use mental again for this project