Integration between real and rendered image...

gato · Post by **gato** » Fri Oct 05, 2007 11:58 pm

Hi, i want to ask you, how make a integration between real image and image rendered with indigo? (like examples of architecture gallery)

this images for example:

http://www.indigorenderer.com/joomla/in ... emId=10363
http://www.indigorenderer.com/joomla/in ... temId=5725
http://www.indigorenderer.com/joomla/in ... temId=8752

Thanks and sorry for my poor english...

zsouthboy · Post by **zsouthboy** » Sat Oct 06, 2007 2:05 am

You will need to render an "Alpha" layer in some other way (for example, Blender), then combine the Indigo render with the "real life" picture using that Alpha layer as a mask.

gato · Post by **gato** » Sat Oct 06, 2007 3:15 am

zsouthboy is there any tuto about this? i don´t find any in google...

Thanks!!!!!

mmyjona · Post by **mmyjona** » Sun Oct 07, 2007 7:05 am

you can render a cut-out as a mask, and a full render with unreal background. Use the "mask" pic as a mask in Photoshop or something upon the rendered pic. Use the real pic as a background. And fix the edge problem with soft brush and blur tool. Remember to adjust the hue/curve/... to make them meet.

gato · Post by **gato** » Mon Oct 08, 2007 8:51 pm

how can i render a cut-out? i have understood the mix process in photoshop, but i don´t know how make a mask :S

Thanks!

DaveC · Post by **DaveC** » Mon Oct 08, 2007 9:17 pm

You make the mask in blender. Render the image in blender and, while you're viewing the render result, press A. This will show the alpha map of the image. Now press F3 to save the image as an alpha mask.

gato · Post by **gato** » Mon Oct 08, 2007 9:50 pm

yes!! it work! Now, only i have to obtain the same perspective between the real and rendered image. It should be very difficult, true???

Somebody knows some tutorial of integration with Indigo?

Thank you very much!!!!!!

DaveC · Post by **DaveC** » Mon Oct 08, 2007 11:24 pm

Use the real image as a background in camera view and line it up before you render it.

gato · Post by **gato** » Mon Oct 08, 2007 11:55 pm

Ok DaveC!

The shadows should be generated with photoshop??? When i show the alpha mask in blender without floor plane the shadows don´t appear (obviusly).

Thanks again!!!!

DaveC · Post by **DaveC** » Tue Oct 09, 2007 8:51 am

I believe it's possible to use a plane in blender to only show shadows, therefore creating an alpha map of the shadows too. But I don't know how well the shadows would match up to the indigo shadows.

DaveC · Post by **DaveC** » Tue Oct 09, 2007 8:54 am

Checked it. In the shading buttons (F5) under materials sub-context, in the shaders tab, make sure 'OnlyShad' is selected. Now it should show up in the alpha map.

gato · Post by **gato** » Tue Oct 09, 2007 9:09 pm

Great!!!! Thank you very very much!!!!

Now, i have to practice to obtain a good integration between shadows and real image.

Thanks again, DaveC.

Aviel · Post by **Aviel** » Fri Nov 09, 2007 5:20 pm

Well, first of all, thank you for using me as reference!

The 2° and 3° renders are mine!!

Well, What I actually did was this.

1. get the site.
Take a nice shoot with the entire builing perspective.. (you have to guess the limits) Even if it you are in an helicopter as the 3° render

you need a nice pic, hi-res to start.

2.angle
open blender...or whatever you use.
chose background image for the camera with the site picture chosen.
Do not forget to change the dimensions to the same of the picture. That will keep the aspec radio...

3.3D
Re draw some elements in common between the 3d and your photograph..
(small building, street..)

4.Match
Match your initial model with the photograph...
now you can add you model to the scene and be sure both perspectives are the same! or at last near...

5.Render!
Check the direction of the sun..shadows..ambience light, daytime..
and render it with a alpha value..
and it's not necessary to render the alpha channel with indigo.
Even the Blender internal engine may be enough you!

6.Post-Pro
now open the first pic and your render in Photoshop, Gimp, whatever..
add it in a new layer...and adjust gamma:
levels, contrast, colors for a better integration.
"match color" option in the adjustments menu may help you..

7.ENJOY!

bye the way..those were my first 2 renders in Indigo...I've got some more and better...
I'm gonna upload then soon..
Cheers!

gato · Post by **gato** » Fri Nov 09, 2007 8:32 pm

Thank you very much, Aviel!!

Great description!! I have some little work in progress, and i´d like to apply this method.

Can i to add to my msn count? I promise not to disturb too.

Thanks again, and sorry my bad english!!

Aviel · Post by **Aviel** » Wed Nov 14, 2007 8:09 am

no hay problema Gato..
agregame si quieres..

Integration between real and rendered image...

Integration between real and rendered image...

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