Building Three Dimensional Objects from Primatives
Rather than using the draw and
makeObject commands, you can create
three-dimensional graphs from primitives. Operation
create3Space creates a three-space
object to which points, curves, and polygons can be added using the
operations from the ThreeSpace domain.
The resulting object can then be displayed in a viewport using
makeViewport3D.
Create the empty three-space object space.
Objects can be sent to this space using the operations exported by the
ThreeSpace domain. The following examples
place curves into space.
Add these three curves to the space.
Create and display the viewport using
makeViewport3D. Options may also be
given but here are displayed as a list with values enclosed in parentheses.
Cube Example
As a second example of the use of primitives, we generate a cube using
a polygon mesh. It is important to use a consistent orientation of the
polygons for correct generation of three-dimensional objects.
Again start with an empty three-space object.
For convenience, give the DoubleFloat
values +1 and -1 names.
Define the vertices of the cube.
Add the faces of the cube as polygons to the space using a consistent
orientation.
Create and display the viewport.
