Take Blender, a parametric modeler, for example. The downside to parametric modeling is that it is generally more complex. Parametric systems are usually history based, meaning you can go back into your model and adjust something (say the width of a line) and the software will automatically adjust everything that is related to it by constraints that you define. You can define constraints, relations and dependencies to objects so that if you change something it will relatively impact other things. Parametric modeling means that your design maintains the original geometry of each object even after you apply rounding and smoothing. It is useful for quick prototyping, but likely won’t be used for the final product. Basically direct modeling means that you work directly with the geometry you see and each edit direct impacts the underlying objects. It is really something that you should see in action to get the whole experience, so check out the video above to watch me showcase some of the awesome features.DesignSpark Mechanical is a direct modeling tool as opposed to a parametric one. No more history of sketches that you have to shift through, no more worrying that changing a sketch made at the beginning will destroy all your hard work.
Want to make a flat face sloped instead? Again, just click and drag how you want.
If you want to change the dimension of a face, you simply select that face and move it to the new dimension that you want. As opposed to the parametric CAD of programs like Solidworks, where you CAD with fully dimensioned 2D sketches that are extruded into 3D shapes, Direct Modeling is based on the paradigm that you should be able to manipulate a 3D design directed in 3D space. It’s CAD approach is called Direct Modeling. Recently, a free program called DesignSpark Mechanical has been introduced to me, and I have falled deeply, deeply in love.įirst, lets talk about what makes DesignSpark Mechanical different. Its seems like every one that I try offers something new and interesting to the table, and I love that. I have been a big fan of trying out different CAD software.
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