I’ve been reading around the net and trying to learn about the theory behind 3D ie. the maths and the physics.

It is all well and good to tell me that to find the length of the side that is perpendicular to one vector and meets the end of the other vector you use the dot product method, but the way I learn and I know many people also learn and remember this way is to UNDERSTAND what you are doing, ie.how and why, not just what…

So I am asking for people who have read good books or sites on the theory of 3D (maths AND physics) to recommend good books or sites that also explain WHY.

The site that i have been reading (struggling) is http://www.euclideanspace.com

it is the site the compelled me to write this post, a good site but no explanation…