[gadzooks]

What's the best way to do GOBO's? Do you add a black and white image as a layer on a emitter material, to mask the light? Or place a Plane with the black and white image in front of the emitter to block the light? I have tried both with little luck? Any suggestions?

[itsallgoode9]

i would imagine the cheapest way would be to do a mask on the material. If you are using a separate plane as a gobo, light would be bouncing off the gobo and add extra, probably needless, calculations to the render.

How have you not been having any luck with either? It seems like it is something fairly straight forward .

[Bubbaloo]

Maybe it's a focusing issue. We had one in our office of our logo on the wall, and it required a focusing lens. I wouldn't think that you could have this effect with only an emitter material and mask. It's probably something that needs to be modeled.

[itsallgoode9]

Maybe it's a focusing issue. We had one in our office of our logo on the wall, and it required a focusing lens. I wouldn't think that you could have this effect with only an emitter material and mask. It's probably something that needs to be modeled.

thinking of it, you're probably right, it would be far too diffused using a material and mask.

[gadzooks]

Im beginning to think that it does need to be modeled. Because the other two ways are not working at all.

[zdeno]

Do you add a black and white image as a layer on a emitter material, to mask the light?

no

Or place a Plane with the black and white image in front of the emitter to block the light?

yes

Any suggestions?

must force light to have almost parallel rays. some long super black tube and very strong emiter near bottom. i think

[jfrancis]

A small light source and a gobo far from the light and near the shadow receiver will give distinct shadows.

A large light source and a gobo near the light and far from the shadow receiver will give very indistinct shadows.

[zak]

You could place the gobo close to the wall or object and hide it from the camera, so its transparent. That could be a way to cheat since maxwell not showing any light beam.

Jesper

[jfrancis]

You could place the gobo close to the wall or object and hide it from the camera, so its transparent. That could be a way to cheat sine maxwell not showing any light beam.

Jesper

good point