Projecting a 3D point to a 2D screen coordinate

Question

Based on information in Chapter 7 of 3D Programming For Windows (Charles Petzold), I\'ve attempted to write as helper function that projects a Point3D to a standard 2D Point

Answer 1

1. It's not clear what you are trying to achieve with aspectRatio coeff. If the point is on the edge of field of view, then it should be on the edge of screen, but if aspectRatio!=1 it isn't. Try setting aspectRatio=1 and make window square. Are the coordinates still incorrect?

2. ActualWidth and ActualHeight seem to be half of the window size really, so screenX will be [-ActualWidth; ActualWidth], but not [0; ActualWidth]. Is that what you want?