Geomset Primitive Representation

Whether a Geomset primitive is displayed or not depends on the settings of its LEVEL, CLFLA and TUFLA attributes (as for a P-line) and also on its OBST attribute. (The OBST attribute is a number which defines the degree of obstruction for clash checking.)

If the PARAGON LEVEL setting is within the LEVEL range specified for the primitive (as its LEVEL attribute), then the primitive will be considered for drawing, otherwise it will not be. If the level condition is satisfied then, the primitive will be displayed if it has an OBST value of 1 or 2 and the REPRESENTATION setting is

REPRESENTATION OBSTRUCTIONS ON

The primitive will be drawn in solid lines if OBST = 2 (hard obstruction), dashed lines if OBST = 1 (soft obstruction0.

The control mechanisms of tube, centerline and obstruction are quite independent of each other. So, for example, if a primitive has an OBST value of 2 and the REPRESENTATION setting is OBSTRUCTIONS ON, the primitive will be drawn whatever the values of its CLFLA and TUFLA attributes and the REPRESENTATION TUBE and CL settings (provided that the PARAGON LEVEL setting is within the LEVEL range of the primitive).

Note:
Whenever you use a REPRESENTATION command, the current design Component is redrawn. If you want to change several REPRESENTATION settings, put them all in the same line so that the Component is only redrawn once. For example,
REPRESENTATION TUBE ON CL OFF OBST ON PPOINTS OFF

The following example shows the Catalog representation of a control valve, and how it might appear in PARAGON with various combinations of TUBE, CL and OBST settings. All the illustrations have PPOINTS ON.

Catalog Control Valve, showing all Primitives

For this example, the settings of the attributes of interest are considered to be:

SCYL 1, SCYL 2 and SDSH 1 are obstruction volume primitives, that is, they represent the obstruction volume of the Component, not its physical geometry and dimensions. The other primitives represent the actual geometry and dimensions of the Component.

The following illustrations show the appearance of the Component under various REPRESENTATION settings.

REPRESENTATION OBST OFF TUBE OFF CL ON

This is the default REPRESENTATION setting for OBSTRUCTION, TUBE and CENTRELINE. The attribute settings chosen for this example are ‘typical’ for a Catalog, and so the REPRESENTATION OBST OFF TUBE OFF CL ON image shows the ‘normal’ appearance of the valve. Notice how the OBST OFF setting does not affect the visibility of the obstruction dish (handwheel space) since it has CLFL TRUE.

REPRESENTATION OBST ON TUBE OFF CL ON

Here the OBST ON setting matches the OBST 2 attribute value of the obstruction cylinders and so they become visible, even though they have CLFL and TUFL both FALSE.

REPRESENTATION OBST ON TUBE OFF CL OFF

Here TUBE and CENTRELINE are both OFF but OBST is ON, and so only the obstruction volume primitives are visible.

REPRESENTATION OBST ON TUBE ON CL OFF

Compared with the REPRESENTATION OBST ON TUBE OFF CL OFF image, those primitives with TUFL TRUE now become visible because TUBE is now ON. The obstruction primitives remain visible because OBST is still ON.

REPRESENTATION OBST OFF TUBE ON CL OFF

OBST is now OFF and so the obstruction cylinders disappear. (The obstruction dish remains because it has TUFL TRUE.)

REPRESENTATION OBST OFF TUBE ON CL ON

Here, all those primitives which have one or both of CLFL, TUFL TRUE are visible.

REPRESENTATION OBST ON TUBE ON CL ON

In the REPRESENTATION OBST ON TUBE ON CL ON image, all the REPRESENTATION settings are ON and so all the Geomset primitives are visible.

REPRESENTATION OBST OFF TUBE OFF CL OFF

Here, all the REPRESENTATION settings are OFF and so no primitives are visible. The Component P-points are still visible since the REPRESENTATION PPOINTS setting in the example is ON.

The full default REPRESENTATION is:

CL ON

TUBE OFF

OBSTRUCTIONS OFF

LEVEL 0

PPOINTS ON LENGTH 50 NUMBERS OFF

PLINES ON PKEYS OFF

which is regained by

REPRESENTATION DEFAULT

Note:
The TVISIBLE and BVISIBLE end visibility flags have no effect in Paragon.