double sided material and interior lighting

[Micha_cg]

... and here my test scene.

[joe_b]

I need a visible surface from inside, but this surface need to be transparent for GI lighting. Nothing works here, always the lighting is blocked. I very miss the option to get a visible surface that cast no shadow for any light source.

I don't believe shadows are your problem, the problem is that the surface is opaque - light cannot penetrate it. I don't believe there is a way to do what you are trying to do all in one material. To get light into the room it needs to be double-sided transparent. To get a background image you would need to use the scene environment, or add another plane with an image on it.

There isn't a way to combine both aspects together in a single material. You can't make the material transparent and make it show a background at the same time - a non-transparent image makes your material opaque, which blocks the light.

[Micha_cg]

Maybe I don't explained it right. At 1.05 it was so, that two side material can contain an opaque and a transparent (or "none") material. For GI the front material counts only, if it is "none" or transparent, than GI light come through. I used it for train interior renderings a lot. A plane with a motion blur landscape texture was placed behind the window glass, but the GI lighting wasn't blocked. Here you can see some images:

http://www.digitalform.de/en/project...-bahn-siemens/

Now at 1.5 I would expect, the transparent side is invisible for lights/GI and the opaque side (front or back, like set) count's for the visible side only.

I need a way to add my motion blur texture planes without to block the lighting. And shouldn't the disabled "cast shadow" option not allow to make one side transparent for GI too? Maybe this could be a way to get the workflow working again.
Or could you add an option, that the let the old workflow working again?
Or could you make, that the transparency of the front side is used for the GI calculation of the backside?

I need a textured plane that is visible for the camera only (best for reflection/refraction too, but it's not so important). The old skp2sided material was so extreme useful.

[renevc]

Thanks for your reply. I understood that it was a bug in vray. I downloaded the latest version and now it works like it did before. 2 sided skp and only a material in one slot, you can leave the other one empty. Shadow from the roof insied and you can see right through it from the outside. Easy as it is!
I will try your version though. I am only not sure about the cast shadow option. I think it only works if you use the rhino render.

[loveshang90]

I thinks you can't make the material transparent and make it show a background at the same time - a non-transparent image makes your material opaque, which blocks the light. Thanks you .

[Micha_cg]

@loveshang90: But it was possible and very useful. Rendering images depends on the freedom of the artist. But you are not interested in rendering, only posting spam links per signature, right?

Joe, did you have seen my last post here and my project images? I need a solution like this.

[loveshang90]

@Micha_cg : Where I'm not spamming signature. I really want to join the forum to see you., And learning more knowledge that I do not know . hope you help .Thank you very much.