blending two images

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blending two images

Post  Chapel on Thu Feb 05, 2015 2:21 pm

Hi all!
Some of you may have experienced this as well: when I show my works people look at it and say "thats nice" but when I explain its 3d-art, they don't really appreciate it. So I want to make a presentation of my works and how it's done.
My question is: how do I make a soft blend of two images (a wireframe image and a finished render) thus revealing the "magic" of Blender and 3d-art.
Can it be done within Blender or is it necessary to use e.g. Gimp and how?

Cheers
Chapel
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Re: blending two images

Post  Yodaman921 on Thu Feb 05, 2015 2:50 pm

Hey Chapel, is it possible to do in Blender? Yes.

I did a quick mock up here:

Image 1:
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Image 2:
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Combined:
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File:
[You must be registered and logged in to see this link.]  (realized the forums can't host files, so I found a random free file hoster, let me know if there's issues with getting the file)

Points to note:
-Is this the right way to do things? Probably not. I'm going to see if I can achieve the same effect using compositing nodes (so stay tuned)
-Bottom plane is basic UV mapped, nothing special. (although I did get rid of it's receive shadows ability)
-Top plane pay special attention to the transparency in the materials and how the texture is set up.
-Empty controls the location of the wipe effect.
-Also, I kept getting a random diagonal line, not sure why.
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Re: blending two images

Post  Yodaman921 on Thu Feb 05, 2015 3:39 pm

New method using compositing nodes.

So in your blender window, make a new scene:
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(hit the little plus next to the scene info and choose full copy)

Make your changes to the scene that you'd like, I just changed the material.

Then set up the nodes accordingly:
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(Alter the nodes going into the factor of the mix node to change the swipe style and aspects of how they mix together.)

Let me know if you'd like the file for this setup or have any questions. Very Happy
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Re: blending two images

Post  Chapel on Thu Feb 05, 2015 6:44 pm

Hi Yodaman!

Thank you - thank you Very Happy

This is exactly what I need.
I've not really worked with nodes, but following the instructions I seem to be able to get the result I was hoping for.

Cool Cool
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Re: blending two images

Post  Yodaman921 on Thu Feb 05, 2015 8:41 pm

Chapel wrote:Hi Yodaman!

Thank you - thank you Very Happy

This is exactly what I need.
I've not really worked with nodes, but following the instructions I seem to be able to get the result I was hoping for.

Cool Cool

Glad I could help, and glad you could follow my quickly written instructions. Using the node setup you could probably even add that effect to videos and animate it. Like having a turntable that switches between wireframe and final render.
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