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How to remove distortions of cylindrical object photos


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DejanD

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Hi!

I have photos of cylindrical object-tree (bark) for more positions. I want to create an image which would consist of bark from more angles (flatten image of tree bark, 360 degrees). I need that to use it with 3Ds max.
Basically I want to have flatten image of tree bark with as little distiortions as possible.

How can I do that, what procedure shall I use?

I appreciate any tip or help.
 
Hi, there.

It's kind of tricky as you may have to use the clone and warp tools in order to flatten out the texture or make it appear flat without obvious distortion and image degradation. And then followed up with careful selection , duplication and positioning of bark elements into the canvas along the image edges in order that the entire image texture will tile seamlessly when texture mapped onto a 3d mesh.

The same will also apply if you were preparing the texture for an entire tree trunk - you still have to create proper seam alignment along the edges where the texture joins together when wrapped around the object.

In short, you have to make it photogenic for use but at the same time maintaining its natural diamond in the rough look.

As I'm leaving in a while, I can't help you visually with this but I see others on the boards who do 3d and may have better ways to do this.

Just hang on.....
 
I'm not sure I fully understand the question to be honest, are you just trying to create a 'bark' image that tiles edge to edge for use in a material?

If so, 'Photo stitching' is the procedure you need, I dunno what PS calls it, never used it, but that is the more common name for it.

If you do get your images stitched you'd then have to remove the seam as dv8_fx said, but for a cylinder you only need to do the left and right edges......there are plenty of tutorials around for creating 'Seamless' images. Should be pretty easy though....its 'bark' after all!

Other than that I dunno what else you could mean.

Regards.
MrTom.
 
I'm also not quite sure what the OP is asking, but my guess is that he wants a set of relatively distortion free images of the bark that he can subsequently tile.

If so, I would suggest a technique that I have sometimes seen done in scientific work: A jig is constructed to hold the camera at a fixed radial distance from the cylindrical object, and then shots are taken every 30-or-so-degrees all the way around it, with some overlap at the beginning and end. This produces a very manageable set of images. A further improvement would be to stand way back and/or use a telecentric lens so that distortion in any one view is minimized.

Is this the sort of thing you are trying to achieve?

Tom
 
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Thx guys for taking time and answering!

In the past I wanted to make texture of round objects(apple). I used lens correction to lower the distortion, but still the results were not good enough.

The hint about wrap helps a lot, totally forgot that.

So multiple images "stiched" together in a good flat texture.

Thx Tom Mann, that is what I mean.

Its like 360 degress panorama of bark into a flat image with as little distortions as possible to get good texture.
The same flat texture can be then applied to 3d model and then I fix seams at the end.

Wrap and panorama video seem very helpful.
 
I deduce it's your first time to do this?

I didn't create the model or texture for this. But I've used this before in a few architectural renders. I'm quite impressed with the texture work the creator did with it.

HorrorTreeSample.jpg

That's just a small section of the texture which as a whole is about 1024W x 4100H pixels complete with knots and broken branch stumps and covers the entire tree trunk from ground to tip and is a composite of images much like what you have taken. As for the creature horror face, it's postworked in PS... lol.

I'm showing you this to give an idea of what to go for in splicing your images to form a flattened tree bark texture.
 
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