A little good news

The physic Library seems to be so complicated. I think we should not use it la
Today I research on rope simulation for our Rolling Star and find a good tutorial(link)
I have written the rope simulation into a C# version. The result is quite satisfied.

Basically, we just need to set the number of nodes and the physic property when construct.
Then we need to adjust the applyForce by vector to make it move.

Here is the video I took:

The action on Rolling is not perfect. We need to improve it later.