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T splines for rhino 4 download4/1/2024 ![]() Vertex_property = coin.SoVertexProperty() (0, len(self.points), self.points)ĭef mesh_sep(vertices, polygons, color=(1,1,0), draw_lines=False): Self.points = list(map(vector3D, points)) Self.object += lor, self.drawstyle, self.data, self.ls So it is really promising but regarding OpenSource it is still science fiction.Ĭode: Select all from pivy import coin, quarter The main issue is that there are no OpenSource mature libs (in closed source you have this one. So it only have advantages regarding CAD. ![]() It is also interesting as it allows one to have watertight shapes and to have better continuity between NURBS Patch by easily assuring a given order of continuity by knot insertion. It means that is is easy to make a hole in a part using the same parametrisation. ![]() ), you are able to change the topology of the object by adding star points to your mesh. I think that one major advantage of T-Splines is to be able to make a lot of operations (scale,holes, chamfer, fillet. We want to be able to make things evolves using specific constraints and not freely. CAD is about parametrisation, I think that it is the difference with Blender/3DSMax/Rhino. I agree with what you said but I think this is not the important part. So if these kinds of features ( nurbs editing / T-spline editing ) were to be added to FC, I think a mesh editor tool would be best implemented as a general FreeCAD tool that could be re-used by more specific Nurbs / T-Spline / Mesh editors. Hope this helps you in your projects.This is really a mesh editing workflow ( made me think about Blender instantly ).įreehand editing a Nurbs patch is also only about editing a mesh grid. Then, use InterpCrv to run a curve through your cosine spaced points. You can split your curve at that point, then cosine space the sub-curves. A neat trick is to take any arbitrary curve in Rhino, and use the Curvature command to find the points of your curve where the curvature is at a maximum. Airfoils are a nice special case, because the change in curvature of the curve is fairly constant, but there are many other areas where consine spacing can be applied with great results. That really illustrates why you would want to use a rule of 2 when constructing a t-spline surface that needs to maintain accuracy.Īnother thing that I realized from feedback is that the cosine spacing approach is useful for much more than just airfoils. If you want to know more, and haven’t yet seen it, you can watch the previous webinar I did about maintaining accuracy with T-Splines. That rule of two really comes into play when you have a T-Spline surface that you want to join to something else. With regards to the rule of 2, that’s really only important when you are using T-Splines. Ready to cosine space your airfoils? Okay, you can download the cosine spacing plugin for Rhino3D here. If you need to change the settings, like say from half to full, then you need to esc out of the command and the restart it. Just pick any curve, and it will be cosine spaced per your settings. ![]() Okay, well now that we’ve made it past that, the rest is easy. I never use HalfToggle personally, I always check the dir of my curves before I run CosSpacing. Not sure where your curve start is? Esc out of the command, use the dir command to see where your curve starts. If you simply hit enter now, the command would half cosine space a curve with the tightly clustered points at the curve start. HalfToggle allows you to have the clustered points at either the curve start or the curve end. When you half cosine space, one end of your curve is tightly clustered with points, the other is much more spread out. Notice that Half now displays as HalfToggle. If you want half cosine spacing, click Half. The default setting is full cosine spacing, so if you want that, just press enter. The second screen can admittedly be a little confusing, but it’s where you toggle between full cosine spacing, and half cosine spacing. The first prompt will ask you how many segments you’d like to divide the curve into. Simply type CosSpacing on the Rhino command line to bring up the tool. Then go to File->Properties->Rhino Options->Plug-ins to install the plugin. Here’s a user guide:Īfter you download it, unzip it, and then place it in your Plug-ins folder, which is inside your Rhinoceros 4.0 folder. I had a friend of mine whip up this plugin for me, and so it’s a little rough around the edges, but it gets the job done. As I outlined in my post on my method for drawing airfoils in Rhino, the curves should be divided using a cosine spacing, rather than the typical division methods provided in Rhino.
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