Speeding up texture mapping onto a sphere in JS — OZONE Asylum, home of the Mad Scientists

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Speeding up texture mapping onto a sphere in JS

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	I've been dabbling at a very basic level with some 3d stuff for a while, not fully comprehending the maths, etc, behind it. Over the last few weeks, I've been reading more material than I care to imagine including some great stuff at Wolfram MathWorld, and finally got my head around mapping points onto a sphere. I've taken it one step further now, after reading this handy guide to texture mapping onto a sphere ([url]http://www.codeproject.com/KB/graphics/Sphere_mapping.aspx[/url]) and have come up with a very basic 2d canvas implementation: http://www.soterm.com/spheremap/index_v3.html Right now, it runs very, very nicely in Chrome, but like a dog in Fx 2, Safari, and not at all in Opera 9.5. Fire up Chrome and have a play - the z-rotation is automatic, but you can drag any of the X/Y/Z sliders at any stage. It's entirely possible my maths is shot to bits, but I'm wondering if there is any way of speeding it up in Fx2 / Safari at all? One issue I'm aware of is that the algorithm to map img -> sphere leaves gaps at a larger radius, presumably because it isn't stretching the image, but just doing basic mapping x/y -> theta/phi. I found another guide ([url]http://local.wasp.uwa.edu.au/~pbourke/texture_colour/spheremap/[/url]) which sounds like it might address this issue, but I've yet to play around with it :D Thanks in advance for any tips on optimisation! Dan [small](Edited by [url=http://www.ozoneasylum.com/user/4819]BillyRayPreachersSon[/url] on 10-05-2008 13:32)[/small] Loading...
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