I am creating a program where I want to rotate circles facing me(point sprites for those familiar with CG) so they look like spheres. Data I have:(adsbygoogle = window.adsbygoogle || []).push({});

- coordinates of every point inside point sprite in [-1,1] € R^2 space.

- center of point sprite in 3D space

- point sprite normal in 3D space

Best thing for me would be if I could find an equation that would test for each pair of (i,j) coordinates if they lie within a circle, rotated to a proper 3D plane determined by normal vector and center of point sprite. Is that possible? PLease bear in mind that I am not really good at this.

sorry for my bad english, but I hope you understood what I meant.

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# Rotating circles in 3D

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