Conversion Notes

Arbortext IsoDraw can process all element types grouped together under Part 1 of the VDAIS specification. It can also read most element types of Part 2. This specification contains rules on how specific elements of an IGES file are to be read and converted.

Subgroup G1
Type	Shape	Name	is converted to
100	-	Circular Arc	Ellipse
102	-	Composite Curve	Group of individual elements
104	1	Conic Arc, Ellipse	Ellipse
	2	Conic Arc, Hyperbola	Polyline
	3	Conic Arc, Parabola	Polyline
106	1	Coordinate Pair	Polyline
	1	Coordinate Pair Vertices	Polyline
110	-	Line	Line
112	-	Parametric Spline Curve	Bézier path
116	-	Point	Line (length 0)
124	-	Transformation Matrix	Transformation of the elements concerned
402	1	Group	Group of individual elements
402	7	Group	Group of individual elements
402	15	Group	Group of individual elements

Subgroup G2
Type	Shape	Name	is converted to
106	2	Coordinate Triple	Polyline
	12	Coordinate Triple Vertices	Polyline

Subgroup G3
Type	Shape	Name	is converted to
106	3	Coordinate Sextuple	Group of lines
	13	Coord. Sextuple Vertices	Group of lines
108	-	Plane	No conversion
114	-	Parametric Spline Surface	Group of Bézier paths *
118	1	Ruled Surface	Group of individual elements *
120	-	Surface of Revolution	Group of individual elements *
122	-	Tabulated Cylinders	Group of individual elements *

Subgroup B1
Type	Shape	Name	is converted to
106	31	Section	Group of lines
	40	Witness Line	Group of lines
202	-	Angular Dimension	Group of individual elements
206	-	Diameter Dimension	Group of individual elements
210	-	General Label	Group of individual elements
212	-	General Note	Text
214	all	Leader	Group of lines/polygons
216	-	Linear Dimension	Group of individual elements
218	-	Ordinate Dimension	Group of individual elements
220	-	Point Dimension	Group of individual elements
222	-	Radius Dimension	Group of individual elements

Subgroup B2
Type	Shape	Name	is converted to
108	-	Plane	No conversion
402	3	Views Visible	Elements are assigned to views
404	-	Drawing	Group of individual elements
406	16	Drawing Size	No conversion
410	-	View	Group of assigned individual elements

Subgroup AF1
Type	Shape	Name	is converted to
126	-	Rational B-Spline Curve	Bézier path
		polynomial form)
128	-	Rational B-Spline Surface	Group of Bézier paths *
		polynomial form)
142	-	Curve on Param. Surface	Bézier path
144	-	Trimmed Param. Surface	Group of individual elements *

Subgroup AF2
Type	Shape	Name	is converted to
126	-	Rational B-Spline Curve	Bézier path
		Bézier path (rational form)
128	-	Rational B-Spline Surface	Group of individual elements *
		Bézier path (rational form)	Group of Bézier paths *

Type	Shape	Name	is converted to
130	-	Offset Curve	Bézier path
132	-	Connect Point	Group of individual elements
140	-	Offset Surface	Group of individual elements *
141	-	Boundary	Bézier path
143	-	Bounded Surface	Group of individual elements *
186	-	Manifold Solid	Group of individual elements *
		B-Rep Object
228	-	General Symbol	Group of individual elements
230	-	Sectioned Area	Fill
304	2	Line Font Definition	Line style
308	-	Subfigure Definition	Group of individual elements
312	-	Text Display	Group of individual elements
314	-	Color Definition	Colors
320	-	Network Subfigure	Group of individual elements
		Definition
402	-	Form 18 Flow	Group of individual elements
402	-	Form 9, 13, 16	Group of individual elements
408	-	Singular Subfigure	Group of individual elements
		Definition
412	-	Rectangular Array	Group of individual elements
		Subfigure Instance
414	-	Circular Array	Group of individual elements
		Subfigure Instance
416	-	Ext. Ref.	Group of individual elements
420	-	Offset Surface	Group of individual elements