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spline control

spline control

spline control

When creating a spline and you want the spline to pass through each point exactly do you need to specify the tolerance with each point? The default is 0.0000; Isn't there a means to set this up in the options? I want to make sure my spline passes through each point exactly and I have noticed on closer examination the spline does not pass through each point; I shouldn't have to specify a tolerance with each point. Any help in understanding this would be appreciated.

RE: spline control

You can not adjust the fit tolerance for different points of the spline. The first and last spline point always passes through the given points. All other points are controlled with the single fit tolerance. I've done such a test. I have set units precision to 0.00000000. I drew 6 randomly distributed points. Through these points I drew a spline. By using "LIST" command I checked the x and y coordinates of the points and compared with the coordinates of spline points. With fit tolerance = 0 the relevant coordinates are matched to 8 decimal places.

RE: spline control

You are using the "LIST" command. I was using the spline icon are they not the same?

Are you saying the units precision needs to be higher?

RE: spline control

Of course, it's the same thing. The icon spline I have only 3 decimal places. "Units precission" may not be higher, I just checked whether the coordinates of the points are identical.

RE: spline control

As you say, the first and last spline points always pass through the given points but how do I get the spline to pass through all the given points? In my situation the spline doesn't always pass through the given points in the middle of the first and last. When I view the spline after I am done creating it, it looks like I missed some of the points despite having selected them. How do I for correct this? ponder

RE: spline control

If you are selecting each point then your spline is actually on each point, and it is a display problem.
Use the command VIEWRES to change the display setting to a higher number.

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