Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: jogr on 2013-06-14, 15:28:20

Title: First test + opacity map problems
Post by: jogr on 2013-06-14, 15:28:20

First impression; pretty good :) Fast for unbiased, better or similar to Iray (NVIDIA) but without the annoying fireflies. I didn't see a single over bright pixel. Nice work! However I can't get the opacity map working (tree leaves). It works in the material editor but not in the render. Any ideas? Cheers.

Title: Re: First test + opacity map problems
Post by: Polymax on 2013-06-14, 15:32:21

Opacity for wor me. Can you share your scene? I will test it!

Title: Re: First test + opacity map problems
Post by: jogr on 2013-06-14, 15:37:00

So it's supposed to be working? Can't do that, it contains licensed models and textures.

EDIT
Same scene in V-Ray

Title: Re: First test + opacity map problems
Post by: jogr on 2013-06-14, 17:26:34

Impressive speed. Second test, interior rendering @ 5000 pixels with decent results after only 15 minutes, attached. However I had to turn off the Corona Sun. It created unwanted shadows in the ceiling and on the walls. Also textures are not good enough for this resolution and some of the bump maps are a bit crazy. Ignore it ;)

Title: Re: First test + opacity map problems
Post by: bdazo on 2013-06-14, 23:24:08

nice tests for sure. I'm also doing some tests in interior scenes myself and was quite impressed with the speed.

Did you get around the opacity problem on the leaves?

Title: Re: First test + opacity map problems
Post by: Ondra on 2013-06-14, 23:31:46

Try to isolate just a single leaf, and if its material renders incorrectly, upload the scene.

Title: Re: First test + opacity map problems
Post by: jogr on 2013-06-17, 11:14:11

Quote from: Keymaster on 2013-06-14, 23:31:46

Try to isolate just a single leaf, and if its material renders incorrectly, upload the scene.

Super :) I will PM the scene.

Title: Re: First test + opacity map problems
Post by: Alessandro on 2013-06-17, 15:06:18

I've some problem with Opacity map too.
In Alpha 4, using a PNG map with an alpha, it works right, so I used just one bitmap file.
In next builds and in Alpha 5 too, it doesn't works, I need to create a B/W opacity map and use it, so it works. Ondra, maybe you change something in PNG filter?

Title: Re: First test + opacity map problems
Post by: quizzy on 2013-06-17, 17:19:11

stumbled onto this as well and the following worked:

And put this bitmap inside a CoronaMapOuput in the opacity slot.

Title: Re: First test + opacity map problems
Post by: Alessandro on 2013-06-17, 17:33:50

Quote from: quizzy on 2013-06-17, 17:19:11

stumbled onto this as well and the following worked:

And put this bitmap inside a CoronaMapOuput in the opacity slot.

Great idea to use the MapOutput map! Thx ;)
Actually, in this way it work.
But, as I've sayed, in Alpha 4 it worked great without this trip...

Thanks again!

Title: Re: First test + opacity map problems
Post by: Ondra on 2013-08-07, 15:38:10

Anyone has any scene where this opacity thing does not work correctly in Alpha 5?

Title: Re: First test + opacity map problems
Post by: Ondra on 2013-08-09, 00:03:34

Nevermind, found the scene in mantis.

There is no bug, the opacity was just incorrectly set - the scene has disabled tiling for the opacity texture. Than means, that the opacity COLOR is used instead of opacity TEXTURE outside of the [0-1] UVW range. This color was set to opaque (white), causing the problems. When set to black it works fine.