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也试椭圆滚动

但凡滚动,必涉及弧长。而椭圆的弧长得用微积分计算!
inRm3D里,轨迹线长度原只是为拖动约束点而计算的,这里却间接的用于计算弧长了。
抛块砖,椭圆在直线上滚动:

滚动椭圆1.gif (293.85 KB)

滚动椭圆1.gif

滚动椭圆1.sgf (9.63 KB)

稍加改动,就滚到圆周上了:

滚动椭圆2.gif (435.49 KB)

滚动椭圆2.gif

滚动椭圆2.sgf (12.81 KB)

高手。学习了。
I can't open this file.  Please tell me Why?
Please tell me more how to plot poin A(-1;-1;-1).
Thanks.
Try new version please.
This question tell me a BUG, has been fixed. thank you very much!

test.gif (5.21 KB)

test.gif

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