Brlcad/How to mged/primitive

New primitives can be created and inserted into the database using the in command. Note that the database must be opened before insertion can take place:

Types of primitives

Arbitrary polyhedron

• arb8 - arbitrary polyhedron with 8 vertices
• arb7 - arbitrary polyhedron with 7 vertices
• arb6 - arbitrary polyhedron with 6 vertices
• arb5 - arbitrary polyhedron with 5 vertices
• arb4 - arbitrary polyhedron with 4 vertices
• arbn - arbitrary polyhedron with n vertices
• box - arbitrary polyhedron (vertex and three vectors)
• rpp - rectangular parallelepiped (cuboid)

Ellipsoid

• ell - ellipsoid (centre and three semi-axes)
• ell1 - ellipsoid (centre, one semi-axes, radius of revolution)
• ellg - ellipsoid (foci and chord length)
• sph - spherical ellipsoid

Truncated general cone

• rec - truncated general cone (right elliptical cylinder)
• tec - truncated general cone (top radii scaled from base radii)
• tgc - truncated general cone (general form)
• trc - truncated general cone (truncated right circular cone)
• rcc - truncated general cone (right circular cylinder)

Other primitives

• ars - arbitrary faceted solid
• bot - bag of triangles
• ebm - extruded bitmap
• dsp - displacement map
• half - half space
• hf - height field (deprecated)
• pipe
• raw - arbitrary polyhedron (right angle wedge)
• tor - torus
• vol - voxels

Cuboid

The rpp (rectangular parallelepiped) primitive to is used to create a cuboid using an area defined by the parameters xmin,xmax,ymin,ymax,zmin,zmax.

# Insert a 2 x 3 x 4 cuboid named cuboid1.s into the database
in cuboid1.s rpp 0 2 0 3 0 4

Sphere

# Insert a sphere of radius 3 named ball.s into the database
in ball.s sph 0 0 0 3