Ray Casting

[luigifonti]

I am trying to implement a ray casting (or ray tracing) algorithm.

It is clear for me how to project a set of point or solid objects to a plane from a given viewpoint, and to reduce them to screen integer coordinates.

But what I really don't know how to implement is the inverse projection, from the screen plane to object space.
Can you help me ?

[dissonance]

I suspect that you need something related to this:

https://youtu.be/ZgcD4C-4u0Q

"Reconstruction from parallel projections and the Radon transform".

This is not trivial, though. I am afraid I cannot help much more than this.