V-Ray Material and Opacity Maps?

[Mike Truly]

Does the Opacity Map slot in the V-Ray material work in the same way as the Opacity Map slot in scanline?

I have a 3D model of an island that is planar mapped from the top down. The 32bit TGA that is assigned to the diffuse and opacity map slots in the V-Ray material has a very straight forward alpha...100% white where the island is and then fading to 100% black at the edges.

The result I get when I render is that the entire island appears mapped at what looks like something like 50% opacity.

Thanks!

[DaForce]

Yeah it should work pretty similar.

If the whole island is rendering as 50% opacity all over that sounds like a mapping problem to me.

Maybe try the same maps on something like a plane to see if they render properly there.

[Mike Truly]

DaForce,

Thanks for the info. I'll dig into this further as I'm sure I've got something screwed up.

Thanks again.

[DaForce]

Heheh no problem.

I just tested out a plane with lots of subs and a noise mod and some map with an opactiy map and it rendered how it should.
So I imagine your mapping is a little bit screwy.

[Mike Truly]

Just to confirm, I did screw it up. I missed the 'Mono Channel Output' setting in the opacity map. Once properly to alpha rather than RGB, things rendered as they should.

Thanks!

[DaForce]

Sweet... good to hear. (that you fixed it, that is)