TYPE: ROP
TITLE: OpenGL Renderer ROP

The OGL operator renders the scene using OpenGL.  This is very similar to the
Object Scene output driver (when using OGL rendering).  However, the OGL driver
has specific parameters to control hidden line rendering.

Arguments may be passed to the script and variable expansion is done before
calling the script.

Parameters:
    Render               - Begins the render.
    Camera               - Which camera to render the scene from.
    Visible Objects      - List of objects visible in the rendered scene.
    Unload SOPs          - Unload SOP geometry after used by the render
    Use Display SOP      - Uses the display SOP instead of the Render SOP.
    Output Picture       - Where the output of the render should be directed.
    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
    Initialize Simulation SOPs - force all simulation SOPs to be reset.
    Super Sample         - If this is more than 1x1, the wireframe
                           output will have smooth lines.
    Override Default Res - Allows specification of the render resolution.
    Resolution           - Resolution to render at.
    Pixel Aspect         - Specifies pixel aspect ratio of the intended
                           viewing device.
    Line Width           - Specify the width of wireframe lines.
    Variable/Constant    - Specify hidden line quality controls.
    Pre-Render Script    - Execute this script before any rendering.
    Pre-Frame Script     - Execute this script before each frame
    Post-Frame Script    - Execute this script after each frame
    Post-Render Script   - Execute this script after all rendering

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

See also: Object Scene(scene)
