Fit rational and non rational surfaces

Rhino
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1

Hi, I have a problem : I would love to join two surfaces :

rhino forum
rhino forum1920×1357 44.6 KB

They are the same degree and have the same point count, but don’t fit when the points are located on the same place for both surfaces…

When I press “info” I see that one surface is rationnal and the other not. Maybe converting ? but how :sweat:?
Thanks !

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How indeed if you don’t attach any files.

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forum.3dm (143.9 KB)
sorry, here is the .3dm

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nobody knows why it happens ? it’s happening again today but the 2 surfaces are just standard sufaces.
They have the same point count, same degree, same point weight but don’t match…

rhino forum 2
rhino forum 21055×587 110 KB

forum 2.3dm (190.3 KB)

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Hi Enzo - run MakeUniform on the upper one.
List shows the knots are not identical.

image

-Pascal

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Hi Enzo
It’s a tolerance thing. Please follow my pictorial below.
Troubleshooting saying that your edges need 0.1225… distance tolerance

image
image733×315 55.9 KB

Solution: move tolerance from 0.01 to 0.5
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image925×211 63.5 KB

Joining the 2 surfaces works now
image
Note: this is done here for academic purposes to prove a point, but I wouldn’t do it in large multi-component or multi surfaces file. I personally would keep the 0.01 tolerance and then use the _JoinEdge command, or if that is not acceptable, I would rebuild the surface(s).

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Hello - this is not a good idea at all. Please see help on JoinEdge. In general,if you need JoinEdge, or giant tolerances, something needs fixing in the model.

-Pascal

2 Likes
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thank you again Pascal ! you’re a serialresolver :laughing:

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thank you too Dorithope, I keep joinEdge in mind too, but I will try not to use it to use it too much because i want to stay precise

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