Hi Simple and weird thing. If I render object with Glossy refractions, it won’t show transparent alpha. -Create box -Assign V-Ray mat -refr 200 -Glossiness 0,9 Affect Alpha on -Render Alpha of box is totally white. Is there something I don’t understand or is this some really stupid thing h…

Objects with refraction dont contribure to the alpha anyway, I just put my glass materials inside a vraymtl wrapper and set the alpha contribution to -1.

But if I have material Glossiness set to 1, alpha looks fine. Only anything under 1 will turn alpha to full white.

Sorry, misread your post. Does this happen even when using an override? What if you right click the object, go to vray properties and set the alpha contribution to -1 there?

Unfortunately V-Ray does not at this time support the “Affect alpha” option for glossy refraction (it never has, for that matter). Best regards, Vlado

Okay, thanks for info. So is there any plans to support it or any workarounds? Nowadays when we do a lot of product visuals too, sometimes it’s really needed option. I know it’s because optimizing renderings, but that should be option to choose. If needed, I’m ready to go fully bruteforce way t…

Well, it is implemented now for SP3, actually. Best regards, Vlado

heh, nice one Vlado :slight_smile:

now this sounds great as i always had the same problem with the aplha map to be opaque. i understand that it’s difficult to render out the appropriate alpha behind glossy materials. after more than 5 years we get it, cool =) ale

In 3ds Max, this is implemented since a long time as I mentioned above. I’m not sure about Maya, I need to check. Best regards, Vlado

No alpha in glossy refraction objects

V-Ray for 3ds Max V-Ray for 3ds Max :: Issues

brobins November 12, 2013, 2:37pm 10

Hi there,

I was just wondering if this is still the case? 5 years since this post and Affect all Channels for Glossy Refrations is still not supported? (using Maya, VRay 2.40).

Thanks,

Ben

Displacement, random render times on Dual Xeon

Topic		Replies	Views
glossy refractions knocking out alpha V-Ray for 3ds Max :: Issues	3	121	July 31, 2014
Long standing Glossy Refraction in Alpha issue. V-Ray for Maya :: Issues alpha , glossy-refraction	3	179	November 20, 2013
Glossy refraction + affect alpha = solid alpha V-Ray for 3ds Max :: Issues	1	233	July 12, 2006
Glossy refraction alpha bug? Or " feature" V-Ray for Maya :: Issues	3	146	April 23, 2012
Refraction = Color + Alpha -> Gives incorrect alpha V-Ray for 3ds Max :: Issues	3	1063	April 26, 2016

No alpha in glossy refraction objects

Related topics