[Papervision3D] Hummingbird3D logo rendered in 3D

[De'Angelo Richardson]

This is very interesting. No wonder why it takes a while for our eyes to adjust when a flash of a bright light hits them. Our eyes see a change and blends them. I guess that's why some patterns move as an illusion too. It's kindof like bits and peices of sight is sent to our brain at a constant speed instead of a full frame every time. And that's why some patterns move, coming from this theory.
 
-De'Angelo



----- Original Message ----
From: Trevor Burton <worldofpaper at googlemail.com>
To: papervision3d at osflash.org
Sent: Sunday, July 8, 2007 8:34:08 AM
Subject: Re: [Papervision3D] Hummingbird3D logo rendered in 3D

There are a great many problems with current theories about human sight. A lot of artists have taken advantage of the quirks of the human eye and visual cortex's processing mechanisms.... It's true that we humans don't strictly see in a frame rate, this could be down to the fact that the retina is covered in an array of receptors that detect different wavelengths of light... when stimulated sufficiently they fire a message to the visual cortex which processes the stream of data from the eye and creates the impression of an image. 

The visual cortex is receiving a constant 'stream' of information from the eye, so the analogy would be more like a video image - where the frames are interlaced - as a particular receptor set may be firing more often than others. In low-light conditions we see in black and white... and some animals are supposed to be able to see only in black and white up to certain distances (if i remember correctly). 

As descendants of predatory animals our eyesight is also geared to be much more sensitive to movement - we can detect much more detail in a moving image than a static one - so much so that you can give the impression of movement in a static image if it's arranged correctly - so 'thirsty' is our brain for movement. 

There's a famous British artist from the early 20th century who made a career out of optical illusions - can't remember her name.

Jon's post mentions an interesting point, you can see the hummingbird's wings at certain points in its flight, this could be due to the change in speed of the wing-beat, the brain is picking up the 'change' in the movement rather than the movement itself. Stick insects take advantage of this as part of their disguise - they sway back and forth like a leaf in the wind... their prey's brain would pick them out of the background if they were stationary... again, the brain is looking for a 'change' rather than just movement. 

This stuff is really fascinating as it cuts to the most fundamental way we perceive the world around us. We make decisions based primarily on what we see, and our eyes can be fooled so easily... makes you think dunnit... 

T


On 7/8/07, Zeh Fernando <zehfernando at zeh.com.br> wrote:
>> Human brains receive visual information at a rate of around 25
>> times per second (changes for each person). However, due to the way
>>  our eyes and brains work, we don't see *frames*, but rather slices 
>>  of time, like frames on a movie (with motion blur). That's why
>> it's easy for anyone to see the difference between 30fps and 60fps
>> on computer graphics - the higher the number of frames rendered, 
>> the better quality each time slice will have.
>
>
> The first part of that is right, the second about being able to tell
> the difference between frame rates is sorta right. It depends on how 
> much motion there is. It is really not possible to discern 24 through
> 60 when the frames have an appropriate amount of motion blur on them.

Just to clarify, that's why I mentioned computer graphics; I was 
considering static, rendered frames (with no motion blur applied).



Zeh

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-- 
Trevor Burton
http://www.paperworld3d.com
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