cur_int - Geometric procedure

Creates a curve

Description

Creates the curve of intersect between a surface and a plane or between two planes. The plane can be defined as a b_plane or as the XY-plane of a coordinate system.

Syntax

cur_int(id, surf, plane, branch:attributes);

REF	id;
REF	surf;
REF	plane;
INT	branch;

Principal parameters

id	- Local identity
surf	- ID of surface (or first coordinate system/b_plane)
plane	- ID of coordinate system or b_plane

Optional parameters

branch

- Requested curve branch. Default value = 1.

Attributes

PEN	- Pen or colour number
LEVEL	- Level number
BLANK	- Visible (0) or invisible (1)
CFONT	- Solid (0), dashed (1), center line (2)
CDASHL	- Dash length
WIDTH	- Linewidth

Example

cur_int(#3, #2, #1, 2);

Creates a curve #3 which is the intersect between #2 and #1. Requested curve branch is branch 2.

Comments

When both surfaces are of type FAC_SUR the resulting curve will be an unordered set of straight lines.

When both surfaces are bounded planes the output intersect becomes a straight line. The limits of the line will be defined by the polygons of the B-planes, i.e. the output line will be the common part of both planes. As options the first plane (branch= -1) or the second plane (branch= -2) define the limits.

If 1000 is added to the value of the branch parameter, ie. 1001 for branch 1 or 1002 for branch 2 etc. the UV-representation of the curve is displayed instead of the real R3 curve.