I will create a cube of those dimensions and sit it on the surface of the X-Y plane. I measure the base and I get 74.8mm x 53.9mm x 7.6mm. I am thinking that I want to center the anvil on the base. We want to orient the STL in a way that gives us the most natural coordinate system for OpenSCAD. OpenSCAD is reasonably responsive in animate view in most cases. OpenSCAD uses a cache and generally only the solid being changed must be rebuilt.
OPENSCAD MODELS CODE
Granted it will get very slow with complicated solids, but one can generally simplify by commenting out code to work in a specific area of the design. In animate view, OpenSCAD will constantly rebuild the solids. But there is a way to get a kind of interactive control. OpenSCAD is known as a non-interactive program. These are the values that we are going to use programmatically. NOTE: the viewport values are shown at the bottom left of the OpenSCAD screen. One can also use the $vpr and the $vpt system variables with this trick. The second trick, use the animate view in OpenSCAD to create a semi-interactive environment. One can see the OpenSCAD created parts even as they move inside the STL or can see the STL as it moves inside of the OpenSCAD parts. One can build up a new model of the STL using the STL as a point of reference. The "%" modifier makes an even more transparent grey. The "#" modifier makes a solid a translucent pink. Use the "#" or "%" modifier on the STL or the solid being created in OpenSCAD. If you are a beginner and would like to ultimately understand what is going on here, I have written an OpenSCAD Instructable for background concepts. We are going to use a technique that allows us to create a shape once and use it in several places.Īs you can see, this Instructable is really for the advanced OpenSCAD user. We are going to reuse the paths with hulls to recreate a web between the sweeps. We are going to use trajectories to create paths for sweeps to recreate some other unusual geometry. We are going to use the hull with the pointer to recreate arbitrary shapes. We are going to create a pointer tool to allow us to take measurements of the STL. We are going to show how one can use the animate view to put OpenSCAD into an interactive mode. We are going to use the STL as a template to guide our construction. Here is a short preview of what we will cover. In fact many of these techniques are useful for creating complex solids in general. Just as it is very good at making good STLs, it is very good at recreating a bad STL to make a good one. I have developed some techniques for using OpenSCAD to recreate a broken or bad STL. OpenSCAD can recreate a mathematically smooth surface. For example, a scanned object will typically have a less than smooth surface. In most cases, one should really recreate the bad STL. It is very simple to use and to understand with the proper explanation of the syntax. OpenSCAD is very good at making good STLs. To fix bad STLs, instead of OpenSCAD I use Blender or Meshlab amongst other tools. If you import a good one and do some simple operations on it, chances are good it will be broken when exported. In fact, it is very good at breaking good ones. But it is not very good at fixing bad STLs. I am a big fan of OpenSCAD, I use it almost exclusively to create 3D models to print.
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