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How do you render transparent glass using Arnold in 3ds Max?

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Message 1 of 6
nievesmiranda0630
1153 Views, 5 Replies

How do you render transparent glass using Arnold in 3ds Max?

I'm currently having problems rendering transparent glass using Arnold in 3DS Max. Pre-render, the glass behaves fine; it's see through. However, after rendering, the glass reflects the background color and becomes opaque so that if I place a different background color behind my render during post-processing, it doesn't show through what is supposed to be transparent glass.

Please see the Arnold render below.The black part on the lower left side is supposed to be transparent glass

5728-glass-2.png


Back in Mental Ray, I had no problem rendering with glass since the outcome is how I needed it to be: the glass ends up being transparent and even if I insert a background color post-render, you can see the color behind the glass as you should. See the two Mental Ray renders I have below: the first one is the render with a transparent background with the second one is the one wherein I inserted a colored background during post-processing. Notice how the glass retains its transparent properties post-render.

5729-glass-1-trans.png

5730-glass-1-bg.png


Any help in the right direction will be greatly appreciated. Thank you!

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5 REPLIES 5
Message 2 of 6
madsd
in reply to: nievesmiranda0630

2 things needs to be done.
I created a video and stole your subject title so if people search on this they will bump into the video automatically.


Link to video:

https://www.youtube.com/watch?v=0F3qWVLDVCM


5731-qweqwe.png



Message 3 of 6
nievesmiranda0630
in reply to: madsd

I did this tutorial! It's what I'm looking for. Thanks so much!

Message 4 of 6
nievesmiranda0630
in reply to: madsd

Hi! So far, your tutorial has worked well. I did encounter a problem though:

5884-alpha.png

5886-alpha-3.png

5887-alpha-2.png

I only used one glass material for this. I don't understand why the Alpha is the way it is. The way I understand it is it should all act the same but the glass in the lower areas are reflecting the background color of the viewport. How do I make them all fully transparent?

Thank youQ


Message 5 of 6

Have you tried Transmit AOVs?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 6 of 6

Yes.

5889-4.png


However, I noticed that the opaque part is actually the flooring which is weird since the Alpha mask for Shadow Matte material is on. I also applied Arnold Properties to it and turned off the opaque option in the properties. I posted this as a separate question on this forum and am still looking for an answer.

Problems like these make me miss the old Shadow/Matte/Reflection in Mental Ray. That was way easier to deal with. Honestly, this is my biggest gripe with Arnold's Shadow Matte so I'm hoping they release a legacy Shadow/Matte/Reflection option.

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