![]() ![]() The curves that drive NURBS surfaces can be any degree: 1st (planar surfaces), 2nd (cylinder or conical), and 3rd (B-rep). Due to this method of generating geometry, surfaces can be precise as there is actual math driving the shape of the splines this is why you can dimension it and constraint it. Surface geometry is solved literally with a network of splines driving the shape of the surface. Parametric modeling is based on NURBS (Non-Uniform Rational B-splines). Plus, the constraints used in parametric modeling ensure that any modifications made to the design are done so with design intent in mind. You can embed intelligence in a design these “smart” solids make it easy to share with other engineers who can quickly ascertain design intent. SOLIDWORKS® customers know all about the power of parametric modeling where you can drive geometry parametrically with dimensions-change one thing and the entire model updates automatically, no need to redraw models. Taking a closer look at each technology will help to reveal what approach might be best for your projects. Both technologies-subdivision and parametric modeling-have pros and cons. The resulting model consists of geometry created using both parametric and subdivision technologies. ![]() However, most often, models created with subdivision surfacing techniques are augmented with parametric features such as holes, chamfers, ribs, shell features, and more. Models created using subdivision modeling techniques often go directly to production without re-creating the model using parametric surfacing techniques. Often people assume that Sub-D modeling is only for the concept phase of the design, but this is not true. By leveraging subdivision (Sub-D) modeling, you can streamline the idea or conceptual stage of design because you don’t have to set up all the sub-structure (curves, surfaces, etc.) necessary in parametric modeling.īoth parametric modeling and subdivision modeling techniques are used to create the final models that will go into production. If it takes you all day to create one concept and another day to modify it, you are two days in and still on that first concept. Organic shapes are challenging to build with parametric modelers. Because of this, especially during the concept phase of design, you typically want to make several models quickly to get a clearer idea of what your customer wants. The visual appeal of a product often plays a huge role in its popularity. The structure that is modeled is the control cage for the subdivided model, it’s not just a modifier that when added just somehow makes the model better.More and more engineers and designers are being called on to develop the look and feel of new products. The use of subdivision surfaces is planned, including the subdivision level. There are also severely non-planar polygons Īnd there are non-manifold errors because of two interior faces Yours has n-gons and triangles that make a different pattern when subdivided ![]() Subdivisions are predictable with quadrilateral face structure. When using Catmull-Clark to refine the forms by adding more geometry and approximating the surface again, showing the subdivision on the control cage doesn’t show the actual vertex positions and if not before, building a model structure with that on you eventually end up with a mess because of that. The modifier is set to be visible in edit mode, and also on the control cage. That’s added geometry that doesn’t do anything to improve the form so it’s useless. ![]() With that it puts 4x more geometry on each subdivision level (with quadrilateral faces), optimally without changing the surface at all. The modifier is set to simple, which subdivides all faces without deforming it. ![]()
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