Alpha Chanel

[Alesso]

What is this Alpha Chanel and why do I need it?

[TOM_cg]

Re: Alpha Chanel

You need Alpha if you want to post process your renderings.
The Alpha generate a "transparency" information, mostly to place a sky beneath the buildings and trees (architectural renderings)..
Hope it helps..

Tom

[Alesso]

Re: Alpha Chanel

Thanks, Tom. I don`t use it. But I have another question - Can I interrupt the process of rendering and continuе later?

[TOM_cg]

Re: Alpha Chanel

nope, resuming a render, like Maxwell does, isn't possible with VRay at that time.. ( correct me if I'm wrong :-/ )

[dalomar_cg]

Re: Alpha Chanel

Directly, stopping a V-ray rendering is not possible. Indirectly, there's a work around. After you stop a rendering, save the image and also save any light information that you have with the file (LC maps, IR maps). When you go back to re-render the image, tell LC or IR to use the saved files instead of recalculating (this can be done through the Modes and setting them to From File). Lastly, in the System Rollout, under the Region division should be an option called Reverse Order. That will keep the same bucket pattern, but go essentially from the "end" of the rendering back to the "start". Once it gets to the area that it has already rendered, then just cancel. From there it becomes a matter of combining the first and second renderings in ps, which shouldn't be that hard. I know this is kind of a long work around, but if you've spend 4 hours calculating an image and need to stop it, its probably worth it.

[Alesso]

Re: Alpha Chanel

Thanks, Dalomar! That 1s realy a very serious problem and I`ll try to do everything step by step how did you tell me.

[graditec]

Re: Alpha Chanel

Never mind i found it under systems.


By graditec at 2007-11-17