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Strange vision irregularities

category: offtopic [glöplog]
 
Ok, had no idea what to put as a topic, but hope this does the trick.

I've done some Googling on this, but I'm none the wiser. Considering a lot of you guys do modelling and at some point have modelled in wireframe, wondered if you've ever come across this problem before:

My brain cannot comprehend a wireframe model as being the correct way around. If I have a wireframe cube on my screen spinning slowly, my brain keeps thinking the smaller part of the cube, (supposed to be at the back,) is at the front. It doesn't matter on complexity, it'll always do it.

Has anyone else ever experienced this?
hypercubes must make you totally mental then
Yeah, thanks Maali! :P

Actually It may be because of them that my brain does it. XD
I can somehow revert the way I see wireframes, "pop" them reversed and back the right way. It needs some concentration, though.
added on the 2012-02-03 15:27:55 by msqrt msqrt
I actually have to concentrate to "pop" them the right way.
enjoy popping.
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added on the 2012-02-03 15:45:56 by yumeji yumeji
It's completely normal. I get it sometimes as well.
added on the 2012-02-03 16:13:02 by Preacher Preacher
It's similar to the 'rotating babe' problem - having placed a reference point on the object,if I focus on the rotation and cache direction of the transformation, I get no problems (unless I'm drunk or extremely tired).
added on the 2012-02-03 16:21:43 by kbi kbi
I think the same effect worked even with projection.
Maybe it's a good mental exercise to try popping these things.
Mmm...
added on the 2012-02-03 16:34:18 by Optimus Optimus
ofc. it's a cut pyramid then.

easiest is to use strict hidden line removal. therefore that thing is. who models in full wireframe these days?
added on the 2012-02-03 16:51:15 by yumeji yumeji
Doesn't work with isometric. It's more prominent with perspective 3d.
http://www.charlespetzold.com/silverlight/RotatingWireframeCube/RotatingWireframeCube.html

This is what does it, even at first viewing of this it was all wrong. I literally have to shake my head to view it correctly.

Complex objects are even worse. XD
Yumeji: Actully I model in full wireframe. :P
it's a common perceptual illusion. it simply boils down to the fact that wireframes do no contain enough visual cues for depth. try shading the pixels of the objects lines based on depth. you will see that your brain is less confused.
added on the 2012-02-03 18:47:57 by button button
Cheers Button, that's actually quite a concise answer, cheers. :)
Dunno if it helps, but on the animation you linked, I manage to switch between correct and incorrect perspective at will by concentrating on a vertex I see as "far" and somehow making it "pop" to the front. However, if I concentrate on a "close" vertex and try to "push" it, it doesn't work.
added on the 2012-02-03 21:54:02 by Tarmil Tarmil
jsyk I had the same problem with the gif I posted but for some reason I can watch it without popping after 1 beer now. it just turns left front right sided vertices if that matters. I wonder if this got anything todo with that left and right turning joghurt cultures. ;)
added on the 2012-02-03 22:03:47 by yumeji yumeji
Since most people, including me, could only see this in CCW and couldn't pop it, here's an augmented versionfor CW.
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or even
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Is it just me, or is the perspective weird sometimes? Even with the added visual clues, my brain sometimes sees the cube spin CCW for no apparent reason.
added on the 2012-02-03 22:20:15 by nitro2k01 nitro2k01
http://www.youtube.com/watch?v=G_Qwp2GdB1M

added on the 2012-02-04 09:03:28 by NoahR NoahR
It's not entirely true, what bittin says. There's more to it than simply too little cues for the brain to percieve depth. The human brain tends to categorize things and compare new things to what it has already categorized. For instance, a face will always be convex, because everyone know, that faces are convex. This is what's used to create the optical ilusions like the one posted above or this simple paper-dog
added on the 2012-02-04 10:03:50 by Punqtured Punqtured
Vision (like all senses) is 1% sensory data and 99% pure imagination.
added on the 2012-02-04 11:30:47 by ham ham
For many many many years until the last year or so whenever i closed my eyes it'd just see a checkerboard effect going into the distance, white and black squares. I just put it down to too many demo's during the early 90s.
added on the 2012-02-04 13:18:50 by Intrinsic Intrinsic
Quote:
It's not entirely true, what bittin says

I think button's going to hate you for that. :DDD

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