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Geometry distortion

Q and A about functionality and how to solve a special task for your application.

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iotek

Geometry distortion

Post by iotek » 27 Jul 2012, 23:39

Hi all!!

Big hello to everyone on the forum, forgive me if this is a silly question but i'm still new to the world of Ventuz :)
I've been ploughing through the Ventuz tutorials and trying to find my feet for a few months now and i'm finally about to start on a project :)

So....I've noticed before that when moving geometry to the extreme left or right of the render window shapes stretch, distort (making squares look like rectangles cylinders stretch to an oval shape etc). I'm now trying to figure out how to stop this happening.
I've tried using different cameras, different projections.....all sorts of combinations, but i cant seem to counter act or solve this!
It seems like a camera lens distortion effect or something, is this what it is??...... :?

Is this something I just have to plan around or is there a straight forward answer to stop this happening.....I'm sure the answer is waving at me...so forgive me if I simply can not see the wood for the trees! ;)

Thanks in advance

Chris
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Christian Krix Schmidt
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Re: Geometry distortion

Post by Christian Krix Schmidt » 31 Jul 2012, 12:38

My guess is that you are dealing with the normal perspective distortion when using Perspective or Field of View projection. The higher the Field of View the stronger the perspective distortion when moving 3D objects away from the center. This is usually not that visible on regular 16:9 outputs but the wider your screen, i.e. the higher your aspect ratio, the worse it gets. There are many different ways of dealing with that. I would use the ProjectionCenterX property of projection nodes to offset the projection center for individual objects instead of moving them with an axis. That is the most elegant solution IMHO. Using this technique you can have any kind of 3D objects anywhere on your canvas. And you can use as many of those nodes in your scene as you need.

Chris
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iotek

Re: Geometry distortion

Post by iotek » 02 Aug 2012, 10:04

HI,

Thanks for the replys :) sorry I should have mentioned that i'm using a super wide screen set up of 3240x1080 for a blend output......it was a little late and i had big V's in my eyes from a long Ventuz session :shock: ;)
I have been working in 16:9 until now and this never really came up as an issue, but as soon as i started in the wide format......scratch head time :?:
I did find a quick work around but it was restricting me. That sounds like the answer i was looking for Chris, I will test it out and come back to you :)

thanks again

Chris
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iotek

Re: Geometry distortion

Post by iotek » 03 Aug 2012, 16:30

Perfect thanks :)
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