Question

I am planning to build in a bending technique into the GPU. Like bending a stick. It doesn’t have to do real physics, but I do want the bending function (to displace the vertices) to have an equal length.

My function will be built out of 2 components:

• The y-position of the stick
• The force against the stick (general, not on a specific place, like wind)

I am bending into the x-direction. I could create some x = y * force formula, but the problem is that this will deform the object in its length.

How can I deform the object, but keep its actual length? How can I constraint my function?

Or in another way:

How can I adjust the power of a polynomial function, while keeping the length over a y-interval? eg. [0,1]

Answer 1

If you want a circular deformation and you should keep the central length unchanged, here you may see the associated formulas: