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creo4 config.pro option documentation for: PIPE_SOLID_CENTERLINE            

pipe_solid_centerline

(Non Spec-Driven)
yes * , no
Set the pipe solid centerline display mode. Piping displays a pipe solid centerline in the graphics window to indicate the center of the pipe solid. After you set this option, the display changes immediately in the current session.
yes - Piping displays pipe solid centerlines.
no - Piping does not display pipe solid centerlines.
 
* The pipe_solid_centerline mode differs from the centerline or solid display capabilities in both the Set Display and the Piping System Tree in the following ways:
The mode set by the pipe_solid_centerline configuration option indicates the center of the pipe solid geometry with a line. This is a global setting for all pipelines.
The Set Display centerline or solid display mode (PIPING > Set Up > Set Display ) enables you to select pipelines in both the active assembly as well as in the subassemblies. You can display the selected pipeline with a pipe solid or centerline.
The Piping System Tree centerline or solid display mode allows you to select one or more pipelines in the active assembly, including subassemblies. You can display the selected pipeline with a pipe solid or centerline. Note that if you are creating pipelines based on the "one pipeline per assembly" modeling method, it is recommended that you use this centerline/solid display mode.