Nurbs editor

[Pauvres_honteux]

Hi microelly2, in your video "command line interface for the surface editor" you seem to utilize sketches, witch is a gigant leap forward in my opinion.
Now, is it possible to use the same sketches to first create ruling surfacs and then force the nurbs/bezier surface to be tangent/curvature correct to it?
In such a manner that the nurbs/bezier surface is completely ruled by the sketches and their ruling surfaces?

And another question: is it possible to use intersections instead of sketches? And ruling surfaces ofcourse.

[microelly2]

Hi microelly2, in your video "command line interface for the surface editor" you seem to utilize sketches, witch is a gigant leap forward in my opinion.
Now, is it possible to use the same sketches to first create ruling surfacs and then force the nurbs/bezier surface to be tangent/curvature correct to it?

there are the other videos where I show, how two faces can be connected with tangent constraints. the same sketch can work for multiple faces too. I will show a usecase to create a car surfaces from a couple of sketches. the workflow will be: start with straight skeches connected to a wire model of the car start bending the sketches to get curved surfaces with common edges.

In such a manner that the nurbs/bezier surface is completely ruled by the sketches and their ruling surfaces?

a wide number of surfaces can be defined by planar edges, and these edges can be based on sketches. Whne the gordon surface is ready to use we will have a very powerful tool. For the moment I have a simpler product method, which calculates a face by the 4 edges. The inner details must be moved using the surface editor. With the gordon surface we can support the inner geometry by sketches too.

And another question: is it possible to use intersections instead of sketches? And ruling surfaces ofcourse.

if you have the intersection curve of two faces the result can be a list of bsplines with degree higher than 3, I use for the moment only degree 3 because the higher values make the methods complex and I do not have time to go deeper into the details. I will look in future to find better ways to get faces connected - fillets which are based on the underlying nurbs grids. The workflow I want: Define wider areas as nice nurbs, than connect them with nice connector faces (with degree <=3). This way is better than a hard intersection curve which is smoothed with a fillet in the next step.

[microelly2]

Here an example of a model which consists of 5 BSpline surfaces all defined by sketches only.
the faces share common border curves.
the model is full parametric by the sketches and the positions of the datum planes.

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[Pauvres_honteux]

If you sweep a "stick/line/pin" along each green curve to get ruling surfaces and used them as common tangent surfaces. Would you then get tangent "shoe surfaces"?

[microelly2]

If you sweep a "stick/line/pin" along each green curve to get ruling surfaces and used them as common tangent surfaces. Would you then get tangent "shoe surfaces"?

The Bezier Product Faces can be connected to force a tangent area on the connected edge.

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The influence of the tangent bending is restricted to the first segment only.
To restrict this area an extra knot can be added to the surface.

[microelly2]

here is the demo how to polish a face to G1.

phpBB [video]

[Pauvres_honteux]

, you really excell in surfaces! Man, you rock!!!
If I interpret this right one can now do automotive interior design?

[microelly2]

, you really excell in surfaces! Man, you rock!!!
If I interpret this right one can now do automotive interior design?

yes, this will be the next but one video,
for today the tea pot example

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[microelly2]

here the tutorial for the hat

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[microelly2]

found a nice task here:
https://forum.freecadweb.org/viewtopic. ... 20#p246432
model a bridge between two cylinders

bp_841.png (119.98 KiB) Viewed 1283 times

bp_840.png (119.53 KiB) Viewed 1283 times

still needs some work on the fillet curvature