My intuition has always been that when any sphere is projected into 2D space that the result will always mathematically be an ellipse (or a circle in degenerate cases).In the past when I was actively doing my own graphics programming and brought this up with other people they were adamant that I was wrong. If I recall correctly they believed the result could be something vaguely egg shaped.Who was correct?Since there is already one answer submitted, I don't wish to totally change my question but I realize I left out important details due to losing familiarity with the field over the years.I intended to ask specifically about perspective projection where the projection is a linear application.The other projections are of course interesting for many uses so I wouldn't want them removed at this point. But it would be great if answers could have perspective projection as their most prominent section.
Does a sphere projected into 2D space always result in an ellipse?
projections;perspective