I need to find the angles between two vectors (v1=p1-p2; v2=p2-p3) defined by three points (p1, p2 and p3). The problem is that I can only get one angle, and I need the three angles that represents the position of the second vector in respect to the first. In other words I need to calculate the angle in sagittal perspective, frontal perspective and tranverse perspective. These two vectors represents two segments of the body and I need to see the position of the distal segment relative to the proximal one.
This is a code that I have until now.
p1=[-83.3958 12.4263 36.4348]; p2=[-86.9626 21.0892 23.2980]; p3=[ -274.7046 58.9844 -171.2332]; v1 = p2-p1; v2 = p3-p2; angle = rad2deg(atan2(norm(cross(v1,v2)),dot(v1,v2)));
I see in other forums, but none have a explain how to calculate the three angles of one vector relative to a another. Thanks in advance.
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