Geomset Primitive Representation

Catalogues and Specifications Reference Manual

Component Design and Representation in PARAGON : 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, centreline 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 Catalogue 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.

Figure 6:6.

Catalogue Control Valve, showing all Primitives

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


SCYL	1	-	OBST 2,	CLFL FALSE,	TUFL FALSE
SCYL	2	-	OBST 2,	CLFL FALSE,	TUFL FALSE
SSPH	1	-	OBST 0,	CLFL TRUE,	TUFL TRUE
SCON	1	-	OBST 0,	CLFL TRUE,	TUFL TRUE
SDSH	1	-	OBST 2,	CLFL TRUE,	TUFL TRUE
SCYL	3	-	OBST 0,	CLFL FALSE,	TUFL TRUE
SCYL	4	-	OBST 0,	CLFL FALSE,	TUFL TRUE
LSNO	1	-	OBST 0,	CLFL FALSE,	TUFL TRUE
LSNO	2	-	OBST 0,	CLFL TRUE,	TUFL FALSE
LSNO	3	-	OBST 0,	CLFL FALSE,	TUFL TRUE
LSNO	4	-	OBST 0,	CLFL TRUE,	TUFL FALSE

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.

Figure 6:7.

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 Catalogue, and so Figure 6:7.: REPRESENTATION OBST OFF TUBE OFF CL ON 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.

Figure 6:8.

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.

Figure 6:9.

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.

Figure 6:10.

REPRESENTATION OBST ON TUBE ON CL OFF

Compared with Figure 6:9.: REPRESENTATION OBST ON TUBE OFF CL OFF, those primitives with TUFL TRUE now become visible because TUBE is now ON. The obstruction primitives remain visible because OBST is still ON.