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Rendering building into photo. How?
show user profile  Loganam
I have pictures of the site where I am designing a building (college architecture student) and I want to render my building using the photos and have shadows from the building looks as though they are cast onto the ground plan of the picture. How can this be achieved? Thanks.

*any tutorial links for this type of quest?


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read 748 times
9/28/2011 9:45:01 PM (last edit: 9/28/2011 9:46:48 PM)
show user profile  Coxy
Look into Mattes. I think there is a reasonable tutorial inside 3DS Max vanilla tutorials.



www.artasmedia.com
read 728 times
9/28/2011 10:46:27 PM (last edit: 9/28/2011 10:47:24 PM)
show user profile  Loganam
* bump.

I'm not sure what you are talking about Coxy. Mattes....vanilla tutorials? What?

Any other suggestions?


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read 701 times
9/30/2011 6:10:40 AM (last edit: 9/30/2011 6:10:40 AM)
show user profile  Jock
If you google mattes, you'll find what your looking for.

Depending on the complexity, another method I sometimes do is place a plane underneath and trace round it in photoshop and create my own shadows from that having used a layer mask to get rid of the plane. But thats for very simple buildings.
read 689 times
9/30/2011 8:55:35 AM (last edit: 9/30/2011 8:55:35 AM)
show user profile  mrgrotey
Yeah that was a pretty crap reply coxy ;) ...for someone who clearly knows nothing about the subject that is.

Vanilla just means max straight out of the box, no extras, plain, vanilla.

You need to learn about the matte/shadow material, its should be used on the ground plane that your model sits, then giving it that material will make it show the background image behind it but keep the shadows visible. You would make any objects with the mattesshadow material that the building would cast shadows onto aswell.




read 688 times
9/30/2011 8:56:05 AM (last edit: 9/30/2011 8:58:37 AM)
show user profile  Loganam
Oh, now I understand. Thanks for this tip guy's. This is exactly the information I needed.


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read 666 times
9/30/2011 7:55:41 PM (last edit: 9/30/2011 7:55:41 PM)
show user profile  mike_renouf
Good video tutorial on Mr. Bluesummers website.




read 657 times
9/30/2011 8:32:10 PM (last edit: 9/30/2011 8:32:10 PM)
show user profile  Coxy
Ok, I admit it my reply was crap, however it was only supposed to be a placeholder until I found the tutorial...




I just forgot to post again so, my apologies! *sad panda face* :(

To make it up to you I found something that might help walk you through some work with Mattes using one of the standard maps in the 3DS Max library. I also had a go at it myself.
http://www.3dworld-wide.com/matte_shadow.html


You have to represent the geometry that is in the image physically in Max and have the Matte's use the photograph to overlay the texture. So you would need to make sure your light source is coming from the same direction as in the image, it might even be worth looking into getting a HDRI from the area so the lighting can be the same in Max as in the photo if you have time/resources.

I challenge you to make something cooler than my dead bear :P





www.artasmedia.com
read 629 times
10/1/2011 10:00:45 PM (last edit: 10/1/2011 10:00:45 PM)
show user profile  Loganam
Right on! I'm finishing the modeling tonight and will move on to rendering tomorrow. I'll be sure to post what I come up with.


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read 611 times
10/2/2011 5:57:14 AM (last edit: 10/2/2011 5:57:14 AM)
show user profile  Loganam
Can anyone tell me why my background image is showing up this dark? It seems to be caused by the vray physical camera.
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By loganam at 2011-10-01


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read 605 times
10/2/2011 8:56:44 AM (last edit: 10/2/2011 9:23:54 AM)
show user profile  Davious
tried self illumination ?

just a thought

is it set as an environment or just a map on a plane, you could ramp the output in the environment.

how is it set up, you will also need to play with the 'sun' but you know that

" Difficult, yes. Impossible , no..."
read 580 times
10/2/2011 9:53:12 PM (last edit: 10/2/2011 9:53:12 PM)
show user profile  Loganam
I used the alt+B command to display this image in the background in order to place my building in the photo. I also am using a matte/shadow material on the ground plane to cast shadows from the building to look like they are on the background image. I'm not sure why vray camera makes the background photo dark like this.

*edit: I figured out I need to save the render as tiff with alpha channel and then comp the two images together.


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read 563 times
10/3/2011 1:04:09 AM (last edit: 10/3/2011 1:55:21 AM)
show user profile  del3d
Camera exposure is too short to expose the background image properly. You need to find the balance between the intensity of your lights and your camera exposure length. That will be the trickiest part. The problem with this method is your environment will show up on the building in a neatly blurred fashion. To avoid this I map my background photo that is to receive the shadows on the ground plane using camera map.

EDIT: honestly, this is generally a bitch and you will end up a lot quicker doing this in photoshop: http://jg3d.blogspot.com/2009/07/tutorial-how-to-make-shadow-matte-with.html

read 557 times
10/3/2011 2:47:54 AM (last edit: 10/3/2011 2:50:24 AM)
show user profile  Loganam
Thanks, del3d. That's the tutorial I found and am now following. It's working out great!


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read 551 times
10/3/2011 3:13:17 AM (last edit: 10/3/2011 3:13:17 AM)
show user profile  del3d
awesome! post your results when you're done!
read 547 times
10/3/2011 3:35:45 AM (last edit: 10/3/2011 3:35:45 AM)
 
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