Support for p2e conversion

[cybersupernova]

I am trying to create a photosphere using a combination of a few normal camera images.
I know the fov, u, v and also the height and width of the input image.

My initial image (equirectangular)

My input image (planer or perspective view [fov=75, u=0, v=0, img_w=640, img_h=480])

I was able to get the (x,y) position using your e2p function and fit those images in the sample equirectangular image near the equator(mid of the image). But as I go near the edges, the images start to overlap since I am missing the pixel manipulation to form curves.

Can you please provide some reading material, since your code has no documentation or, if you got time, can you please help me out.