Vanishing point

3d Design and graphics

Vanishing point

Postby Timber_Wolf_2 on 02/2/2012, 2:17 pm

I have a photo that has multiple vanishing points...

vanishing point problem.jpg


I have a layered PSD with this photo broken up into more than a dozen layers, and the resulting negative space filled in with cloning, pasting, etc. I want to add a slight camera movement to the scene in AE, but with all the various angles, it became nightmarish to try to rotate, align, and warp all these layers in AE. So I abandoned that concept and decided I'd utilixe PS's Vanishing Point filter.

Every tutorial I've seen on the Vanishing Point Exchange uses nice, crisp-lined squarish photos that a noob could do. But real-world photos aren't that simple. As you can see, my photo here has about 7 planes that i'd like to spread into 3D space (yes, I know there are really more than 7, but I will only be using 7 for my particular project). These multiple planes (with some odd angles thrown in) create multiple vanishing points, which the Vanishing Point Exchange really doesn't like.

My question is, just how powerful is the VPE? Is it really so limited that it can only do straight lines and 90 degree angles? If it really can do what i'm asking it to do (which is to asign 3D perspective to planes in more than just one vanishing point), how do I do that? What am I missing
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Re: Vanishing point

Postby jsn951 on 02/5/2012, 8:50 pm

vpe can also be exported to 3D apps like max, have you tried that, it would be a lot easier to manage your scene. also when you start exploring perspectives that dont actually exist from the original photo, the results are usually not good because your stretching your pixels. Its not impossible, but usually done in a 3D app with camera mapping tools, and possibly some unwrapping and painting to make up for those stretched pixels. very challenging but worth the effort :D

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Re: Vanishing point

Postby Timber_Wolf_2 on 02/6/2012, 7:25 am

Thanks for the suggestions, jsn951. A few followup items for you...

First, I'm not really wanting to do anything terribly drastic with perspective to my photo. I just want to add a slight movement to the camera like this. Nothing huge. Of course, like I said, the reason why I don't do this is because of the drastic perspectives of the walls and such in the photo. It just gets really hairy.

Second, my problem isn't with the VPE export, it's with VPE itself. VPE can only do a single vanishing point, not two. So even if I were to export it to a 3D app, I would have the same problem.

Third, someone suggested to me that it may be possible to import multiple VPE scenes into the same AE comp... Is that possible? How would I do that?

Also, whatever you embedded into your last post got blocked by my workplace network....
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Re: Vanishing point

Postby Timber_Wolf_2 on 02/6/2012, 11:52 am

Ok, so I found a work-around to resolve the VPEs shortcomings...

In PS, I divided the photo up into layers based on planes and objects, so well over a dozen layers. Then I turn off all the layers but two: the ground (plane #2, as the constant) and another given layer. I then use the VP filter to define 3D geometry to my planes/object and export the VPE for AE. The VPE automatically renders out unique PNGs of my 3D planes and skews the image to look as if it is being viewed from straight on. In AE, I import the unique PNG of whatever layer I defined in VPE, make it a 3D layer, and position it in 3D space (with the full original picture behind it for reference). I do that process for all individual planes, and the result is a faux-3D scene in AE.

I am in the middle of this process, so I will let you know how it turns out and how I actually end up solving the problem of the white backgrounds in my PNGs... In the mean time, any thoughts or hints for the best way to fix that would be appreciated.
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Re: Vanishing point

Postby smmithjjohn on 05/24/2013, 4:45 am

I just joined it although I haven't had time to try it out yet.
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Re: Vanishing point

Postby chrisfig on 06/15/2013, 9:29 pm

I know this is a randomly bumped thread so it's probably not especially relevant, but I'm not sure the photo is as complex as it's being made out to be.

I'm not as familar on the AE side of things so I don't know exactly how this would apply to the problem at hand, but this is an image with just two vanishing points. Quick approximation:

ae_perspective.jpg


You've got a fairly straight forward two point perspective image here, as the vertically pointing lines are all pretty straight up and down there's no real third vanishing point. Every plane, no matter where the line/crack/etc. may appear to point, is following these two vanishing points. The planes are at varying depths, but they're all converging on the same vanishing points per the laws of perspective.

Hope that helps.
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