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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: #growth

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  • half a sphere

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  • Rendering Of A Cannonball

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remix of d/15194 by u/robbyg

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  • More realistic shading.

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remix of d/15194 by u/robbyg

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  • Poor man's ray tracing

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  • Ball?!

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  • u/f8f82804
    #d3 #sphere #perspective
  • u/katkip
    how lol
  • u/pavel
    I draw #default one pixel at a time and treat (x,y) of the pixels as angles (a,b) in spherical coordinates. Spherical to 3d cartesian is x=r*sin(a)*sin(b), y=r*cos(a)*sin(b), z=r*cos(b). Projecting 3d to 2d cartesian is x'=x/(2+y/r), y'=z/(2+y/r), and scaling pixel size by 1/(2+y/r)**2 so stuff in the back is smaller.

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