pouët.net

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.

I actually have to concentrate to "pop" them the right way.

enjoy popping.

It's completely normal. I get it sometimes as well.

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).

I think the same effect worked even with projection.
Maybe it's a good mental exercise to try popping these things.
Mmm...

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?

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.

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.

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. ;)

Since most people, including me, could only see this in CCW and couldn't pop it, here's an augmented versionfor CW.

or even

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.

http://www.youtube.com/watch?v=G_Qwp2GdB1M

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

Vision (like all senses) is 1% sensory data and 99% pure imagination.

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.

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