Make light shine through a hard surface?

[AdamT]

Do you want the light to illuminate the inside of the solid surface? If so you can use subsurface scattering, but the light won't cast a shadow on the opposite side unless you use it in the transparency channel (slow!). Or, just fake it by putting a compositing tag on the SSS object with "cast shadows" turned off.

[SecretDesign]

no, cant use SSS.
Need the light to pass through the surface without illuminating the surface.

[vid2k2]

Is this what you have in mind ?

[SecretDesign]

yes, exactly.. how did you do that?

[vid2k2]

Ahhh, Good.

Simple.
Make cube separate surfaces
make cube editable
Hide the top surface(so you can see in)
Make the spot light
Choose
Light>Scene>Exclude
then ...
Pull face 1 (of the cube) into the "Exclude" field

Hope that helps

[Per-Anders]

You can also use hte compositing tag and turn off the cast shadows option on the object you don't wish to cast shadows.

[SecretDesign]

what if I have a lw object, how do I make it editable?
The selection is grayed out so I cant click on it.

[Per-Anders]

Then it's already editable, so you can skip that step (just go into polygon mode etc).

[SecretDesign]

Ah good :)

Thanks for your help guys :thumbsup:

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