United3dArtists Archive

the_ant · Post by **the_ant** » 16 Jan 2016, 13:52

Hi all
Is it possible to change background in post processing without re-render scenes with glasses on it?

Draise · Post by **Draise** » 16 Jan 2016, 14:09

Yeah. Render your background with alpha. Or with a solid 255 blue or green or red. In blender, fusion or natron you can use a keyer/matte node that can take that color, shifts it to alpha then you can put any background in behind.

the_ant · Post by **the_ant** » 18 Jan 2016, 09:05

Hi Draise ...Thanks a lot for your answer...

...but i want to do that in tS 761b8 mSide..is it possible? and is there in the web any tutorial about this?

bitkar · Post by **bitkar** » 18 Jan 2016, 12:44

in modelside it iis possible with lightworks renderer - just render it as PSD file and check the mask option. It should make a photoshop file with mask. You can now add a background layer to have background.

clintonman · Post by **clintonman** » 18 Jan 2016, 15:26

Two tutorials that use the render to photoshop feature of truespace:

3d for illustrators:
http://clintons3d.com/tutorials/truespa ... rs.asp.htm"

multipass rendering:
http://clintons3d.com/tutorials/truespa ... ss.asp.htm"

list of downloadable courses
vi ... =19&t=4960"

some more links:
http://kabrite.com/truespace/?page_id=16"

the_ant · Post by **the_ant** » 19 Jan 2016, 09:37

O.M.G. you're all so fast with solutions....

the_ant · Post by **the_ant** » 19 Jan 2016, 12:45

Cuold someone help me about PSD options?

Masks and Layers options are so numerous...

PS. I couldn't use PhShop but i got a great collection of free software like Gimp and so on...

Sorry to bother you...but i'm "little" confused at my first time PSD multilayer file rendering

Draise · Post by **Draise** » 19 Jan 2016, 14:57

Single with Alpha Mask checked would do it I think.

clintonman · Post by **clintonman** » 19 Jan 2016, 14:58

In that case try rendering as 32 bit png or tga files. I think that's the most direct answer to your original question.

Draise · Post by **Draise** » 19 Jan 2016, 15:09

I like PNG's, compresses better than TGA's. But Single with Mask to a PNG would yeah, work great.

Krita (free) opens PSD's with no issue preserving layers. So yo ucan render out into PSD's too.

bitkar · Post by **bitkar** » 21 Jan 2016, 15:09

sooo many options... clinton is right... just render it as 32 bit PNG, its maybe easier, then load it into PS and add your background.

the_ant · Post by **the_ant** » 22 Jan 2016, 13:24

Thank you all!!!!

i'll post the result of your help as soon as possible!!!!

the_ant · Post by **the_ant** » 06 Feb 2016, 10:54

i tried 32bit .png solution...but it seems to be wrong way...(see transparency of glasses)

clintonman · Post by **clintonman** » 06 Feb 2016, 20:20

Check that you have raycast and raytracing enabled. You need both for transparency.

bitkar · Post by **bitkar** » 08 Feb 2016, 09:44

and it works only for Lightworks, not Vray I think (not sure). If this wouldnt work maybe try to render to PSD and use the transparency channel.

the_ant · Post by **the_ant** » 15 Mar 2016, 10:21

Hi all,

i must probably surrender to do this, (due to my learn limits too?)

i tried with your hints about... but always had wrong results.

Both raytracing and raycast "on" and "32bit png" fails to render a changeble background in post-pro

rear transparent objects like glass.

Same results with alpha set "on" in psd files.

Probably i need a tSp step by step tutorial but unobtainable on the web (actually).

Anyway ...thank you all to play attention about my questions and for your very quick answering.

You're all so special ...like this mighty forum!

Love so much tSp..its resources and its beautiful interface!

See you soon from Italy!

Draise · Post by **Draise** » 15 Mar 2016, 16:43

I gave it a shot myself. Yeah, you are right, in the PNG and PSD the alpha mask data does not account for the transparency of a shader.

And you cannot set the background color or image to anything with an alpha channel.

You can only put in a solid color.

Which means it's compllicated:
Use a color channel to drive a greyscale alpha mask in the post processed image. I do not know how to do this in photoshop or any layered system - but with nodes it's prettty easy.. but you'd need to be comfortable with postprocessing with a node based compositing system.

Sorry about the "not so simple" system.

Let me know if you need me to show you how to do it in Blender, Natron or Fusion 7 or something (all free node based compositing software).

the_ant · Post by **the_ant** » 16 Mar 2016, 07:56

Thank you Draise

Have some hints in Blander could be fine (it will be a future challange in 3d software for me)..

..but i'm impressed/beloved (and don't want to leave) the capability of tSp to import "layered-3d-dxf (ascii r12)" files from Autocad-like programs (i'm an intellicad CMS 6.6 owner) i use for modelling (extrude-sweep-bool_opt) 2d polylines or regions.

So if you want ... i'll stay tuned in for yours "lectio magistralis"

P.S. I'm little weak in render Ambient Occlusion with Lightworks tSp 761 sp8 modelside...have you some hints about?

Thank you very very much..

cthulhu · Post by **cthulhu** » 19 Mar 2016, 03:45

window.zip: (1.44 MiB) Downloaded 419 times

Attached is an example scene and output: Photoshop PSD (made in Paint Shop Pro) and TGA (32-bit uncompressed from trueSpace 7.5).

The shader for the glass is dual layer. Layer 1 has full transparency and layer 2 has glass with overdriven values for specular, mirror, etc. so that it shows up over the transparent layer.

Rendering to 32-bit uncompressed TGA, you can then load in a paint program, create a new layer, set the layer blending mode to Light, load a selection from the alpha channel, invert the selection, then paint/fill in the "background" with whatever.

Examples images:

the_ant · Post by **the_ant** » 19 Mar 2016, 09:51

O.M.G. ..Amazing "cthulhu"

Thaaaaaaanks so much!!!

Immediately downloaded to explore your material...

so i'll apply your hints in my future scenes with glasses!!

the_ant · Post by **the_ant** » 20 Mar 2016, 21:23

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Change backgrounds in post processing

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