Getting alpha channel in V-Ray

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17 Jan, 2012 Vadim
17 Jan, 2012 # Re: Getting alpha channel in V-Ray
In general, there is a room with a large window. As a background to the picture plane in a distance. Everything looks nice, but the background is bound to the max. If I remove the plane from the background - VRay in alpha channels does not preserve the transparency of the glass. That is, it becomes a mirror and dark background respectively enclose no longer possible. If the object settings, add transparency - lost glare and reflections of the room ... It is possible then to fix it? How can we make the Wray see a window like a translucent object and add it to the alpha channels?


19 Jan, 2012 Anton (Staff Author)
19 Jan, 2012 # Re: Getting alpha channel in V-Ray
Hello! Here are the conditions under which in the V-Ray can get translucency Refract'A on the alpha channel, or simply to render its translucency - For translucent object nothing should not be. Just pure Environment Background. No Plain with pictures of other objects, etc. - Material with a non-black color Refract. - There, in the Refract, it must be activated tick Affect alpha. Affect alpha, held from English as "influence" or "affect" alpha. That is literally points to take into account whether the translucency Refract'A in the alpha or RGB channels. - Save RGB or alpha channel rendering in supporting transparency format. For example, to PNG. You're probably just not included in the material of glass Affect alpha or alpha or retains the rendering does not support transparency in the format. For example, jpg. Fulfill all the above conditions, and if you get a translucent glass in a window, behind which you can safely kompouzit right back to you in Photoshop😉


10 Feb, 2012 Leonid
10 Feb, 2012 # Re: Getting alpha channel in V-Ray
Thanks, helped 👍


31 Mar, 2013 Andrey
31 Mar, 2013 # Re: Getting alpha channel in V-Ray
Good day .... explain pliz. in my example. Back insert in Photoshop. Naturally it should be reflected in the mirror ... How do we say Max Alpha in the mirror, and if this is possible ... Thank you


19 Jan, 2012 Anton (Staff Author)
31 Mar, 2013 # Re: Getting alpha channel in V-Ray
Hello!

Let's start with the fact that you have a curtain in front of the window in this case, the question of the alpha Beck behind it is no longer relevant. Only then do Plaine with a picture of the window.

With regard to the alpha mirror, it is in principle possible. You have to do everything as described in the topic of alpha-channel , not only disables revlekshen in the global settings, and the window make luminous Plain or himself back. Then the glowing back simply be reflected in the mirror and you will be able to allocate it to the color in Photoshop the same Magic Wand. But in any case, substitute back in Photoshop on the reflection in the mirror - a bad idea, though, because you need to reflect, scale and shift the image in the mirror so that it corresponded exactly to the picture outside the window. Simply adjust the picture to beke all.



31 Mar, 2013 Andrey
11 Apr, 2013 # Re: Getting alpha channel in V-Ray
After some anguish decided that Plain outside much easier) Thanks for the answer


26 Jun, 2013 amph
26 Jun, 2013 # Re: Getting alpha channel in V-Ray
Welcome renderstuff. Is it possible to adjust the alpha channel so that the objects are removed from the camera for more than a predetermined distance are not displayed in the alpha channel (renderer VRay)? Thank you in advance.


19 Jan, 2012 Anton (Staff Author)
26 Jun, 2013 # Re: Getting alpha channel in V-Ray
Hello! A "cut-off" the remote parts of the scene may be sharp or must necessarily be gradual (gradient)?


26 Jun, 2013 amph
30 Jun, 2013 # Re: Getting alpha channel in V-Ray
Sharp. The idea that held alternately rendering multiple models in one scene. And we need to models that are outside the studio (studio influence on the alpha channel off) did not affect the alpha.


19 Jan, 2012 Anton (Staff Author)
30 Jun, 2013 # Re: Getting alpha channel in V-Ray
If sharp, the Clipping Planes thy help😉


26 Jun, 2013 amph
1 Jul, 2013 # Re: Getting alpha channel in V-Ray
Thank you, very useful feature 🙂


15 Sep, 2017 Cyber4ainik
15 Sep, 2017 # Re: Getting alpha channel in V-Ray
ABOUT!!! INFLUENCE ON ALPHA !!! Exactly! For a long time I was looking for a solution to the problem. In the current version of v-ray, this setting looks like an Affect channels drop-down list with options: color only, color + alpha, all channels.


15 Sep, 2017 Cyber4ainik
15 Sep, 2017 # Re: Getting alpha channel in V-Ray
By the way, here is the above dude with a mirror picture spread with a question. In short, who can benefit from it. For each object, in addition to the transparent material, you can manually register its effect on the alpha channel. right click on the object, then v-ray properties, and on the right there is an alpha contribution at the top - default = 1, can be reduced to 0


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