I would like to select multiple object from a rectangle drawn with the mouse. But once unprojected, the rectangle become a trapeze.
These objects are on an inclined plane facing the camera.
The intersections between these objects and the inclined plane are discs.
I see how to do if it was a rectangle:
Check if the centres of the objects are in the rectangle.
Check for an intersection with the 4 edges of the rectangle and the objects. To select the objects that have their centre outside the rectangle, but intersect it.
But with a trapeze, I don't see how to do the point 1. and the point 2. is maybe more difficult.
So I wonder what is the best way to select theses objects?
