still images
During the process of visualizing a black hole in OpenGL, I found some remarkebly beautiful transformations. Completely unrelated to any physical signifcance they are still a wonderful visualization of geometical and mathematical beauty and symmetry.
The problem I was faced with was to map a celestrial sky (with a black hole in its middle) to a 2D flat surface. Astronomical coordinates are generelly given in declination and ascension (similiar to latitiude and longitude). Trigonometric functions are used for this task. Switching around randomly cosinus and sinus functions with different periods lead to these images.
