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4fingers

Algorithm for Conical or Diamond gradients

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I am wanting to know how you could create these gradients, so far I have only gotten a linear gradient using this:
gradient = sin(pos.x * Pi)
The gradients I am wanting to make are Conical: http://aycu38.webshots.com/image/44037/2000058759270077993_rs.jpg and Diamond: http://aycu18.webshots.com/image/43017/2000052956529979247_rs.jpg Thanks [Edited by - 4fingers on February 5, 2008 11:47:06 AM]

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For diamond, determine manhattan distance: (pos.x + pos.y) / size

Conical is a bit trickier... the core is to get the angle theta=atan2(pos.y, pos.x), but then you run that through a transform that turns its 0..2*pi value into a 1..0..1 interpolated value. |abs(pi-theta)|/pi is the linear version, which might look okay.

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