How can I find the angle between two points on a bezier curve?
bezier, opengl
Solution
Maybe something like this is what you need.
How to calculate the tangent to a Bezier curve
This is hard to find online. It must be a secret closely held by those who know. Oh you can find the math formulae, but have fun interpreting them if you are not a mathematician. So what is a poor developer to do? Go back to school.
I spent a couple days bashing my skull over this one. I googled my brains out (which was easier once my skull was sufficiently bashed). Then one bright beautiful Saturday, I was holed up in my developer's dungeon resting my weary bones. I had the TV on in front of me and Wikipedia to the right and there I was lazily switching between watching them both.
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Problem
In my current OpenGL project I am trying to make the links of a chain hug the contours of a Bezier curve. How can I find the angle between two points on the curve so that I can position the links of the chain so that they follow the curve. Here is a picture of the curve and chain, I need some way of rotating the links so that they follow the curve. Does anybody here know how to do this?