jasonstewart Posted June 16, 2014 Share Posted June 16, 2014 Hey everyone. This is an issue that I have not run into before but it is killing me right now. I have a living room scene that features a large mirror across from the camera (all this is specified by the Interior Designer who is my client). Everything is great except that there is no alpha cutout of the windows in the mirror reflection and I want to manually paste in my background in photoshop. There is one window across from the camera and it behaves correctly, the glass material is the same. I tried bumping up refraction depth thinking maybe it wasn't enough or something with no luck. Has anyone run into this before? Is there a solution? The alternative would be to model a deck that is outside the windows and either let my HDR be visible or put a plane out there with an image but that is so much less flexible. Thanks in advance. Link to comment Share on other sites More sharing options...
Corey Beaulieu Posted June 16, 2014 Share Posted June 16, 2014 http://www.workshop.mintviz.com/tutorials/matte-shadow-and-reflection-using-v-ray-2-0/ This may help. Link to comment Share on other sites More sharing options...
jasonstewart Posted June 16, 2014 Author Share Posted June 16, 2014 I don't think using mattes will help. I need to get the alpha cutout of a window opening shown in the reflection of a mirror. Because the mirror is opaque vray thinks that it should be opaque but what is reflecting in the mirror is some wall and a few windows that show just the environment (black) and light (white). I want to put an image behind it in PS after rendering but cutting it out manually isn't a very good solution becuase the reflections are slightly blurred and it is a PITA. I ended up just putting a plane with my image outside the windows with a vray light material to control the brightness of it. Still would be nice to find a solution because I am sure I will run into this again. Link to comment Share on other sites More sharing options...
Corey Beaulieu Posted June 16, 2014 Share Posted June 16, 2014 What you did is what most people would do... The matte takes a bit of creativity. You would render a separate pass and the glass on your window (the chair) would be the object you are looking for the reflection of and the mirror (the floor) would be where you are looking. Then you use the matte as a mask in PS. Link to comment Share on other sites More sharing options...
Scott Schroeder Posted June 16, 2014 Share Posted June 16, 2014 It's actually super simple. Just check affect ALL CHANNELS in the mirror material's reflection. I had an old scene that had a similar set up. For some reason selecting COLOR+ALPHA does not produce the same result, so make sure you are selecting all channels. Link to comment Share on other sites More sharing options...
jasonstewart Posted June 16, 2014 Author Share Posted June 16, 2014 Awesome, I will have to try that out. Sent from my SAMSUNG-SM-N900A using Tapatalk Link to comment Share on other sites More sharing options...
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