Transparency in front of reflective surface issue

[rmulley 43]

So this has driving a bit crazy because I work like this quite often.

Is I place a transparency map in front of a non-reflective surface it's fine, but as soon as I make that rear surface reflective the transparent parts of the front material changes whats behind it

the transparency map is definitely solid black because you can't see it when the rear material isn't transparent.

Anyone have a work around for this ?

[Justin Montoya 294]

Have you tried to turn off shadow casting for the plane object that has the transparency map?

[rmulley 43]

50 minutes ago, Justin Montoya said:

Have you tried to turn off shadow casting for the plane object that has the transparency map?

I have yes, still the same

[Justin Montoya 294]

That should work. 

I'm curious of your V-Ray settings then.

I suspect you may have come across a transparency map bug.  Are you using the Use GPU option? If so, Try turning that off and see if it has a different result.  I have had them stop working for me when the Use GPU option is turned on.

[rmulley 43]

GPU is turned off.

 

 

Edited March 20, 2020 by rmulley

[Justin Montoya 294]

That's sounding familiar, Dome light or GI settings..  Wait where did the rest of your message go?

Try this, go into the V-ray raytrace settings and boost the min number of recursive rays to 6 or 8 or more.  The default is 5 I believe and that isn't high enough for many reflections in scenes.  

Does that help?

[rmulley 43]

9 hours ago, Justin Montoya said:

That's sounding familiar, Dome light or GI settings..  Wait where did the rest of your message go?

 

haha, I thought I solved it by turning off the dome light.... then I realized I still had the reflection turned down on the material. Once I realized I deleted my post.

I'll try the recursive rays idea.  Thanks.

[rmulley 43]

Recursive rays didn't help. However, I think I hit on something.  Not sure where it came from but I had a feeling it might be something to do with face normals. I rotated the plane around and lo and behold the problem disappears....

 

[rmulley 43]

Here it is with the texture map rotated 180 degrees.

For the record the face normal is facing backwards towards the rear part.

[Justin Montoya 294]

I've seen that as well!  Shaded representation didn't translate the same as the VRay translation.  Curious what happens if you use Flat as opposed to Cubic mapping?