User Nmz787 brlcad - BRL-CAD/brlcad-docs GitHub Wiki

Installation

From SVN

svn checkout svn://svn.code.sf.net/p/brlcad/code/brlcad/trunk brlcad-svn-trunk

cd brlcad-svn-trunk

cmake ../ -DCMAKE_BUILD_TYPE=Debug -DBRLCAD_BUNDLED_LIBS=Bundled

Ubuntu

sudo apt-get install brlcad

Getting Started

  • Start mged from the command prompt, and create a new file for storing CAD design data (BRL-CAD calls these files geometry databases and uses the .g file extension by default)
    • mged your_desired_filename_here.g

Radio example

  • The following lines of code will produce something that looks like a walkie-talkie style radio.
  • It uses BRL-CAD's Solid Primitive Shapes
  • At the mged interactive command interpreter window, type the following:
    • in body.s rpp 0 16 0 32 0 48
    • in btn.s rec 8 30 36 0 3 0 4 0 0 0 0 2
    • in btn2.s ell1 8 33 36 4 0 0 2
    • in spkr.s tor 16 16 16 1 0 0 12 1
    • in ant.s rcc 2 2 46 0 0 48 1
    • in knob.s rcc 4 4 40 8 0 0 5
  • Pasting or typing those lines should look like this:

  • Press enter if you haven't already
  • If you don't see a window with an image open up, click mged's Tools menu, then Graphics Window

  • Pressing the keyboard CTRL button along with the left mouse-button will pan around the displayed image
  • Pressing the keyboard SHIFT button along with the left mouse-button will move the view away from or toward the center (where the cartesian plane X,Y,Z are 0,0,0)

Primitive Examples

tgc

Truncated general cone

Handled by

  • in make form create

Arguments

  • vertex, vectors H A B, magnitudes of vectors C D

RCC example via TGC

  • An rcc primitive is a special form of a tgc, you can reproduce a right-circular-cylinder at vertex 0,0,0 with height 10, and a base and top of radius 1 (both in the XY plane):
    • in aaa.s tgc 0 0 0 0 0 10 1 0 0 0 1 0 1 1
  • increasing the radius of the base and top to 5:
    • in aaa.s tgc 0 0 0 0 0 10 5 0 0 0 5 0 5 5

breaking down the command

  • in tgc (base X, Y, Z) (height vector X,Y,Z) (ellipse base radius part A vector X,Y,Z) (ellipse base radius part B vector X,Y,Z) (top radius scalar C, restricted to same plane active in base part A) (top radius scalar D, restricted to same plane active in base part B)

elliptic cones in either X or Y directions

  • 5 in the X direction, 10 in the Y (same at the top)
    • in aaa.s tgc 0 0 0 0 0 10 5 0 0 0 10 0 5 10
  • 10 in the X direction, 5 in the Y (same at the top)
    • in aaaa.s tgc 0 0 0 0 0 10 10 0 0 0 5 0 10 5
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