I have come across a problem that is maybe already been answer before. I'd like to know how, using OpenGL/OpenTK(wrapper for C#) to draw an arrows to represent a vector position,length and direction.

The issue is that, I have a problem drawing the arrow head. The problem is that i can't quite fin d a easy way to know the location and rotation of the triangle (arrow head)

I'd like to know how to draw an arrow to represent a vector position, length and direction.

The issue is that I can't quite find an easy way to know the location and rotation of the triangle representing the arrow head.

If it can help, I'm using OpenGL/OpenTK(wrapper for C#).