Chequered Madness

x[c][r] = c*square + xa*sine (r*xf+xp) + ya*cosine (c*yf+yp) + ra*sine (d*rf+rp);
y[c][r] = r
*square + xa*cosine (r*xf+xp) + ya*sine (c*yf+yp) + ra*cosine (d*rf+rp);

It's an array of quadrangles with a warping functions in x, y and r (the distance from the centre) applied to each corner.

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