Scrim material?

[Streetwise]

So this is an odd question, born out of a commercial photography mind-set. Probably something really easy.

I have an interior scene that contains an out-of-view skylight that is running a bit too bright. The scene is lit with a single HDRI. Of course I can make the hole somewhat smaller, or maybe even a plane to flag of some of the light, but is there a material that lets light pass through it, plus the ability to control how much light passes through? I've heard of the 2-sided translucent material, but I don't know if that's what I'm looking for.

[glorybound]

Maybe a non-renderable plane covering part of the opening.

[super gnu]

just a vray material with a grey opacity map? use vraycolor map and adjust the level with that.

[Streetwise]

I don't see where you can adjust the opacity of a colormap unless I'm missing something. Using a plane is the best idea for now, but it can change the dynamics of the opening to block part of it off. Hmmm....

[Raven]

Put the vraycolor in the opacity slot of the material

[Streetwise]

put the vraycolor in the opacity slot of the material

ahh.. Thank you!

[particlerealities]

What abut just applying a unique glass material to the skylight and adding a bit of gray/black to the fog color? That'll reduce the light coming through.

[Streetwise]

What abut just applying a unique glass material to the skylight and adding a bit of gray/black to the fog color? That'll reduce the light coming through.

Now that's a great idea! With vraycolor in an opacity slot, I couldn't figure that out, even with a gray diffuse. I tried unchecking the diffuse map too. I'll have to play around with that more when I can. I *really* like the glass idea though. Thanks for that.

[super gnu]

there is essentially no difference between using glass ( with a grey colour in the fog colour slot) and a material with a grey colour in the opacity slot. its just a change of slots.

plus with the glass material you will need a thickness to the glass to get the fog working , and calculate refractions and fog attenuation.


tbh im not sure which would render faster, but the opacity option is easier to set up and requires only a single polygon. in what sense could you not figure it out?

[Streetwise]

in what sense could you not figure it out?

I wasn't sure about a value in the difuse channel, or if you have nothing, and only a diffuse color in the VRayColor Map? If you assign a value in VRayColor, what do you use? Black? That would make the most sense I guess, because you would then adjust the opacity of the opacity map?

[Raven]

Hey David

Keep the diffuse black so it wont bounce any light.
Is your Vraycolor set to be full white?
You can also leave the opacity value at 100% and just control the transparency buy adjusting your vraycolors values.

[Streetwise]

Hey David

Keep the diffuse black so it wont bounce any light.
Is your Vraycolor set to be full white?
You can also leave the opacity value at 100% and just control the transparency buy adjusting your vraycolors values.

Vraycolor is set to whatever the default is. It sounds like there's two ways to adjust the opacity then? I would think that leaving VRay color at white and adjusting the opacity would make the most sense... I'll give it a try. Thanks!

[super gnu]

if you want to use the map percentage spinner to adjust the opcaity, you have to put a black map (or any colour *other* than white) in the slot for it to work. white is 100% opaque, same as no map. so the spinner would be adjusting between opaque and.. opaque.