Erik Harris wrote:
On 9/6/2010 9:23 AM, David Laakso wrote:
PS In the world of geometry is that a sphere or is it known as a simple
circular object?
I think the idea is that the gradient makes it appear spherical. Since
it uses a linear gradient and not a radial gradient, though, the effect
is somewhat primitive.
It is our perception that makes it appear spherical. A perception of
depth that we develop from children. Young babies perceive a sphere in
the outside world (beyond ones head) as just a circle with a gradient.
Unlike our eyes that allow stereoscopic 2D images to appear 3
dimensional [1], a gradient on a 2D surface (the canvas) with the
right background causes something that is just a circle to appear 3
dimensional.
To prove this, try looking at the test, first with one eye covered and
then swap and then cover your other eye. Apart from causing eyes
strain, the affect is more 2D.
So in the worlds of both geometry and computer graphics, that's a simple
circular object. You'd need to change the gradient and apply a transform
to the text that's supposed to be on the object to make it a sphere. :)
Yes, the non gradient text partially destroys the optical illusion.
Alan, I'm curious - your "CSS Test" link goes to a page that lists
Firefox above safari on your "Honor Roll" (presumably for CSS
compliance). Why is that? Firefox is my preferred browser, but my
understanding is that WebKit (Safari and Chrome) has had better
standards compliance than Firefox by pretty much any measure for quite
awhile now.
That was last revised on the 21st of Oct 2009 (so outdated). I
consider layout, formatting, selectors and accessibility among other
things.
1. <http://en.wikipedia.org/wiki/Stereoscopic_vision>
--
Alan http://css-class.com/
Armies Cannot Stop An Idea Whose Time Has Come. - Victor Hugo
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