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u(t) is called 60 times per second. t: Elapsed time in seconds. S: Shorthand for Math.sin. C: Shorthand for Math.cos. T: Shorthand for Math.tan. R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5) c: A 1920x1080 canvas. x: A 2D context for that canvas.
Theme challenge of the month: #storm

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  • Raycasted rotating sphere with UV-mapping!

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remix of d/5600 by u/p01

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remix of d/9674 by u/f8f82804

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  • u/donbright
    thats cool... how does it work?
  • u/joeytwiddle
    Very nice! #halftone
  • u/f8f82804
    u/donbright: I used the parameterization from d/5600. I like it a lot because it keeps fairly even density of dots on the surface. It's based on cylindrical coordinates where each point is at a different vertical level and the points spiral around. The key is that not all values of i result in drawing a dot. We drop the back half of the sphere with C(a) >0, but we also implicitly drop points where s*i-i*i is negative
  • u/donbright
    thanks... fascinating...

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  • 2 swimming magnets (ver2)

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  • Ghost of Julia ver3

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  • Ghost of Julia ver4 (with alpha!)

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  • Ghost of Julia ver2
  • u/andrea270872
    /* LOGIC The point (I,J) depends on t and scans the screen from top-left to bottom-right, then restarts. It also hops of circa 50 pixels in both directions. The point (A,B) is a scaled and translated version of (I,J); (A,B) is centered arund (0,0) and goes approximately from -1,5 to +1.5 in both directions. The loop is a simplified version of the Julia iterated fractal loop: - i starts from 0, and goes max to 25 iterations, and the point starts at z=A+i*B - the function being computed is: Z=Z^2+(-0.8,+0.2) separating real and imaginary part, the formula is: A = A*A-B*B-.8 AND B = 2*A*B+.2 and the notation [A,B] saves me from using a temp variable. The loop exits if: - i is 25 or - distance of (A,B) from (0,0) is more than 2 */
  • u/f8f82804
    #dither #halftone #fractal

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