Converting Phi, Theta to X,Y

[markoakden]

More of a question than an issue. Does anyone know of way to convert the two angles phi & theta to x,y coordinates on the current screen? I am overlaying icons on top of the 360 pano and when the user moves the pano, I need to move the icons (clipping them to the view). I have this working well, but have had to estimate the x,y, position, based on approximation. My maths is not good enough to project the inside of a sphere onto a flat surface! I need a routine something like: pt2xy (p,t), where the routine projects the current p,t and returns x,y. There must be a routine like this buried in Kaleidoscope somewhere?