Outputs an arrow primitive. The arrow starts in the origin and ends
in (0, 0, height). thickness is the overall thickness of
the arrow, headheight and headscale specify the
height and a factor for the radius of the arrow head.
Outputs the three axes that represent the current coordinate system.
The X-,Y- and Z-axis are colored red, green and blue. thickness
specifies the thickness of the arrows and shader is used as
surface shader for the entire coordinate system.
Outputs a default header into the RIB stream.
This function can be called right after RiBegin() to write the
following information into the RIB stream:
Outputs a grid primitive. thickness determines the thickness
of the grid lines and cells the number of gridlines.
The grid lies on the XY plane and is centered at the origin. The grid
spacing is 1 unit. The grid uses the given shader and color.