Question

How to normalise the mouse coordinates into the orthographic planr obtained

Answer 1

Orthographic projection (also called orthogonal) is the simplest type of projection we'll discuss: it consists of merely projecting points and vectors in a perpendicular fashion onto a plane, as shown in Figure 4.26. As in the case of the mirror transform, we define the plane M by a point Q on the plane and (unit) normal vector û..