Fred, can you provide some background and justification for this? Such as, why the solid angles at a point (if you have a whole lots of planes meeting there) add up to 4 Pi? Jim Propp On Fri, May 29, 2015 at 3:40 PM, Fred Lunnon <fred.lunnon@gmail.com> wrote:
A + B + C - pi , where A,B,C denote dihedral angles between (normals to) three planes meeting at the common point.
WFL
On 5/29/15, Henry Baker <hbaker1@pipeline.com> wrote:
BTW, what exactly IS a "solid angle" ?
A 2D angle is acos(A.B), where A,B are unit vectors, and A.B is the dot product.
What is the analogous quaternion formula for a solid angle ?
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