You can do this by : mged geometry.FreeCAD is built from scratch to be totally controlled by Python scripts. The sphere can be viewed by opening the database file using mged. This should now create a new database file called as geometry. You should also make a note that primitive names end with a.
Primitives created are given a unique name, which is passed as the first argument in all our primitive functions.
And just like that, we’re halfway there! Now, let’s go ahead and create a sphere and save it into our database. db = Database("geometry.g", "Test BRL-CAD DB file") The next step is to open a database that you want to save your geometry into. from brlcad.vmath import Transform from brlcad.geometry import Database from brlcad import primitives The very first step is to import the libraries and modules that you might require. So go ahead and create a python file, let’s call ours sphere.py. For this example, let’s work on creating a sphere! Great! Let’s now go ahead and create our first primitive. In just a couple of seconds, you’re all ready! You will also see a lot of errors, but they shouldn’t be an issue unless they stop the installation half-way. You might have to use sudo while setting up depending on your system. export BRLCAD_PATH="YOUR_BRLCAD_INSTALLATION".Now, it’s time to setup Python BRL-CAD (PB from now on). A second part of this post (coming soon) will be dedicated to working with the tcl approach. In this post, I’ll be sharing some insights and examples into creating procedural geometry using the ctypesgen approach. Python Procedural Geometry : Ctypesgen Setting Up Python BRL-CAD To avoid this, we resort to solving the problem of procedural geometry using the ctypesgen approach. it involves interaction with the geometry editor, mged. This approach though, is still plagued with the major shortcoming of the pre-existing procedural geometry architecture in BRL-CAD, viz. Here, the python script for creating a particular shape would have multiple functions creating different primitives and one main caller that would put it all together. tcl scripts which are then fed into MGED to create the required complex geometry. We now express procedural geometry as pythonic scripts that generate. Approach 2 : Tcl ScriptsĪs a solution to shortcomings of the ctypesgen approach, a new approach for procedural geometry was developed. A minor drawback with this approach is that, the bindings might need to be updates to accommodate changes brought to the C code. These bindings parse the header files of the primitives from the installed version of BRL-CAD and uses them to construct a standard library of abstractions around the bindings. The project focusses on wrapping BRL-CAD’s primitives in python using ctypesgen. Python BRL-CAD came into existence in 2014. Python Procedural Geometry Approach 1 : Ctypesgen The issue with this approach is that, it depends on interacting with BRL-CAD’s geometry editor GUI, mged. The script sets up functions (procedures)that create spheres (SPHs) and cylinders (RCCs) going back and forth in various directions, creating the corresponding geometry for each of those directions.
This is an example shell script that uses BRL-CAD tools to procedurally create and render the SGI Cube. Procedural geometry of sorts has existed in BRL-CAD for a while now. “Make it work, make it right, make it fast.” - Kent Beck The procedural approach is not only easier but it also saves you time and can be done with only a few lines of code.
The classical way would be to figure out the 3-D co-ordinates for one of the wheels and then infer the co-ordinates for the other wheels (given that they’re equidistant from one another). Now let’s say you were given this tank sans the wheels and asked to put the wheels in place. You can see there are 7 wheels surrounded by a track plate. Focus on the continuous track (caterpillar track) in this tank.
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