Once converted to a mesh there are many more possible options for correcting open geometry due to the fact you are able to manipulate polygons independently. In this case, it may be easier/faster to edit the mesh directly. Many times “ShowEdges” results will be rather low (ex. If this is the case, you simply need to undo the meshing process and correct the problem areas. A quick inspection of the highlighted edges may show how a quick remodel of a surface may dramatically decrease this error result. This is usually the best option when dealing with naked edges/non-manifold edge counts over 100. It is now the time to use your modeling discretion to asses the problem and decide whether it is better/easier/faster to correct the issue in its current mesh state or return to the original NURBS geometry and remodel components. You’re here because your model had either naked edges, non-manifold edges or a combination of both. If your geometry was built properly you will have no naked edges or non-manifold edges and may proceed to Stepħ- Ok you, trouble makers. this command will usually open a quick dialogue box that gives you the option of defining the resolution at which your model will be converted into meshes.Ħ- After your model has been converted to a mesh with the desired resolution (may take several attempts) you will run the “ShowEdges” command. sinuous surfaces will require much more polygons than flat straight surfaces)Ī. Ideally, you would aim to use the fewest amount of polygons to complete the desired geometry. Thus when converting a NURBS model to mesh you must define resolution at which to replicate the original geometry using simple planar polygons. NURBS (non-uniform rational bsplines) volumes are usually computationally much heavier than meshes and therefore meshes are used to create file paths for 3dprinting.

Remember to choose Naked Edges in the list of ShowEdges Command.ĥ- If your 3d model was carefully built in Rhino3D using NURBS geometry the first step in preparing a print file is to convert the model into a mesh using the “mesh” command. The main difference between a NURBS surface and a mesh is that the former is defined by curve functions rather than simple planar polygons. The open surfaces are shown with purple edges in Rhino after you use ShowEdges. The image below shows an open object vs a closed object.

List of useful commands to create closed NURBS volumes:īoolean (split/union/intersection/difference)Ĥ- After you finish modeling, the first thing you should do is to use ShowEdges command to make sure the object is closed.Failure of these commands is a fast indicator your 3D model is not watertight! Regularly employing the Join for surfaces and Boolean Union or Boolean difference for 3d object. We use Near only if it is necessary.ģ- If possible, always build closed geometry as you work. This stands for Object Snap and allows you to move geometry using its exact geometric attributes.Ģ- Turn the Near from the OSNAP off to decrease the possibility of having an open object. Quick tips for cleaner modeling in Rhino3Dġ- Always model using OSNAPs turned on.

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