VARKON Version 1.15 1997-10-24

sur_offs - Geometric procedure

Creates an offset surface.


Description

Creates an offset surface, which is a surface at a constant distance to a previously defined surface. The offset surface is an exact, analytically defined, surface (no approximations).

Syntax

sur_offs(id, ref, offset:attributes);

REF	id;
REF	ref;
FLOAT	offset;

Principal parameters

id	- Local identity
ref	- Surface
offset	- Offset distance

Optional parameters

None

Attributes

PEN	- Pen or colour number
LEVEL	- Level number
BLANK	- Visible (0) or invisible (1)
SFONT	- Solid boundary and dashed midcurves (0)
SDASHL	- Dashlength

Example

sur_offs(#3, #2, -2.3);

Creates an offset surface #3, which will be at the constant distance -2.3 from surface #2.


Comments

A check that the offset distance is less than the minimum principal curvature is not yet implemented.