Integrating 3D models with photography
Interested in integrating your 3D work with the real world? This might help
#
1
12-06-2015
, 12:03 AM
Noober than noob
Join Date: Sep 2011
Join Date: Sep 2011
Posts: 520
How to keep specular with transparent background?
Can you help me with this problem, please?
The goal is to render this hourglass with the specular but also transparent background.
Edit: I got the wrong file first. See 2nd upload.
It should look like the one with black bg.
I have tried render passes, but they will also come with a black background instead of transparent. Is there any other way? I was thinking of chroma-keying it as a last resort but I can't figure out what program to use for it.
Last edited by SilverFeather; 12-06-2015 at 12:06 AM.
#
2
18-06-2015
, 11:34 PM
The Maya Mountain
Join Date: Aug 2002
Join Date: Aug 2002
Location: Seattle, WA
Posts: 8,245
#
3
19-06-2015
, 10:46 PM
Noober than noob
Join Date: Sep 2011
Join Date: Sep 2011
Posts: 520
I already did that, the problem is that it does not come with transparent background, it comes with a black background instead. The only way I can see this working somewhat is if I copy the hourglass' glass body, flatten the copy and then make it provide alpha from the glass' back, so that the specular can be seen while the bg is transparent.I think you'll need to do render passes, such as a specular pass that you can layer on top of your diffuse pass, etc.
#
4
20-06-2015
, 12:38 AM
Lead Modeler - Framestore
Join Date: Feb 2003
Join Date: Feb 2003
Location: UK
Posts: 6,287
Jay
#
5
22-06-2015
, 02:12 PM
Noober than noob
Join Date: Sep 2011
Join Date: Sep 2011
Posts: 520
In the alpha channel I only see the hourglass' shape as white but the specular is in no way displayed as white in the alpha mode. When I've made a render pass export, this is what I ended up with. As you can see, there is no transparency in the specular render's background.sometimes the transparency may only be visible via the alpha channel in this case...have you checked?
Jay
Then there's the diffuse PNG. Neither one has transparent background so if I were to combine these images, I'd still get a black background.
Last edited by SilverFeather; 22-06-2015 at 02:14 PM.
#
6
22-06-2015
, 04:49 PM
Super Moderator
Join Date: Dec 2006
Join Date: Dec 2006
Location: South FL
Posts: 3,522
#
7
22-06-2015
, 06:06 PM
Noober than noob
Join Date: Sep 2011
Join Date: Sep 2011
Posts: 520
Yeah but how would I composite the specular? (what I meant by this is - I have tried all possible operations when overlaying the two files, I only end up with a faint rectangular background, which still does not keep transparency of the background to full). Does this mean I'd have to make a specular with something else? Also, this is my workaround for what I needed (see attachment). I've copied the glass, flattened it and added a yellowish color to it and set its transparency to act as alpha behind the glass. It's pretty close to what I wanted so I guess this will do for what I need it (a graphic in a power point presentation).As far as I know specular doesn't show in the pass. It's supposed to be composited with an add operation.
Last edited by SilverFeather; 22-06-2015 at 07:19 PM.
#
8
23-06-2015
, 05:29 AM
Lead Modeler - Framestore
Join Date: Feb 2003
Join Date: Feb 2003
Location: UK
Posts: 6,287
Jay
#
9
23-06-2015
, 07:59 PM
Noober than noob
Join Date: Sep 2011
Join Date: Sep 2011
Posts: 520
Thank you. I have attached it to this post.can you zip up the scene and save it as an ma file please. It doesnt need any comp to get good glass its just a glass setting with an alpha, theres some things you can do I'll take a look....
Jay