TYPE: ROP
TITLE: 3D Texture Generator ROP

This output operator is used to drive the image3d program which generates 3D
texture maps.  The operator sets up all necessary options and then
invokes the program.

Parameters:
    Render               - Begins the render.
    Frame Range          - Allows specification of a range of frames to render.
    Start/End/Inc        - Specifies the first & last frames and the increment.
                           Note that when rendering a sequence of images with a
                           fraction Inc, $N is the number of the frame rendered,
                           $F is the nearest integer frame number, $FF is the 
                           floating point frame number
    Output Image         - Name of the 3D texture to generate
    Resolution           - Resolution (in X, Y and Z) of the 3D texture
    SHOP                 - The SHOP which controls the parameters for
                           the texture generation.
    Verbose              - Generation statistics will be printed out
    Render As            - Some SHOPs require particle or metaball
                           geometry to run properly. The clipped options allow
                           you to override the bounding box of the geometry
                           with your own. The options are:
	No geometry   - No geometry is sent to i3dgen
	Meta/Particle - Send particles/metaballs
	Raw Point     - Interpret points as particles
    Initialize Sim.      - Dynamic simulations will be initialized
    Object/SOP           - Choose the object/SOP to specify the geometry
    Particle scale       - An additional multiplier to particle scale.
                           This is primarily useful when sending down
                           raw points.
    Displace Bound       - Enlarge the bounding box by this amount
    Min/Max Bounds       - The bounding box of the 3D texture
    Oversampling         - Anti-aliasing controls in texture generation
    Variance             - Threshold for anti-aliasing levels

Local Variables:
    N        - The current frame of the range specified.  This always
               starts at 1.
    NRENDER  - Total number of frames being rendered.
