here is my situation: I'm defining a triangle by three points (A,B,C), and now I want to move one of them (A point) up and down along the z-axis, at the same time, I hope the total area of this triangle will stay the same, how to let GH move the rest of the two points accordingly to maintain the area value?
to be specifically, let's say:
A point: moves up and down, so only z-value will be changed, x-value and y-value will stay intact.
B point: only moves in the YZ Plane, the x-value will not be changed.
C point: moves anywhere when needed, totally free point.
please check out the attachment for clearance.