Simscape Multibody Spline only one Point

Hello.

I want to plot a trajectory into the Mechanics Explorer using the Spline block.

I looked at the Steve Miller example (Four Bar Linkage Optimization in Simscape - File Exchange - MATLAB Central (mathworks.com)) and cannot figure out why it doesn't work.

I have a Matlab variable with the x and y cooordinates called anyOldSpline. Modifying End Conditions has no effect.

The result is one single marker at [0 0] which isn't even part of the spline array.

Can anyone help? Thanks in advance

Answer 1

[Steve Miller]

From what I see, it should be just fine. Normally, your spline should be nx3, but I also tried entering nx2 and still saw it plot properly both in the block dialog box and in the Mechanics Explorer.

Things to try:

1. Have you tried changing the level of zoom? Perhaps you are too far away to see the line and can only see the markers (spheres)
2. Is there a solid sphere with a very large radius hiding the spline?

--Steve

[Tobias Panitz]

Thanks for the reply Steve.

So things I have tried:

• adding a z-coordinate to anyOldSpline
• Zooming in and out as far as possible
• Try it in a different model
• change the units
• transform the vector
• add only positive values
• change the marker

Nothing seems to be working.

Maybe there is an alternative? I'm trying to porject a line into the mechanics explorer so I can see the vehicle movement relative to the path it is supposed to follow.

[Steve Miller]

Upload your model and I can check it more closely.

--Steve

[Tobias Panitz]

Setting the graphics type to From Geometry did the trick.

[Steve Miller]

Great! I should have seen that in your dialog box setting above. Thanks for letting me know.

--Steve