dwitter.net | #sphere

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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.
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  • f8f82804: #d3 #sphere #perspective
  • katkip: how lol
  • 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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  • pavel: Single stroke beach ball sketch

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  • metamero: this dweet series is great
  • f8f82804: thanks! I'm having a lot of fun with it. Hopefully I'll be able to fix up the distortion a little and reivist some of these ideas
  • f8f82804: the distortion here is pretty bad because i'm applying the correction incorrectly! see d/11812

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