Spherical mapping

Im fairly new at using AVS and im having trouble mapping a rectangular image to a sphere Im not sure which trans effect to use for this effect. The preset involves a texered starfield which means it re-renders each frame so a gradual movement to the sphere is no help. It tried using trans/movement and even though im sure I had the maths right the screen just flashed a solid colour. Any help on this would be appreciated.

uh....you want a sphere movement?

Perhaps you could add the preset so that we can take a look at it and see what we're talking about and help you with the code?

well if you want sphere movement then just search the forums once.

Use dm and think raytracing.
As for pherical mapping you can use:

x=atan2(pz,px);

y=asin(py);

Um basically this is what i have at the moment. The stuff after the buffer save transforms it from the flat to the sphere but i want to correct it so that a) it doesn't have the lines from the movement and b) the back of the sphere is not just the inverse of the front.

I did search for sphere but could not find what i wanted.

Also is there anyway to get AVS to render at a high res but display at a lower one?

is this what you're looking for?

trans/movement (rectangular coordinates, wrap, bilinear filtering):
d=sqr(x)+sqr(y); z=if(below(d,1),sqrt(1-d),1);
x=x/z; y=y/z;