Converting IGES Entities to MicroStation Elements

You can convert IGES entities (left) to the related MicroStation elements (right). The supported IGES entities are listed as follows:

IGES Entity	MicroStation Element
100. Circular Arc Closed arc Arc	15. Ellipse 16. Arc
102. Composite Curve	14. Complex Chain
104. Conic Arc: Closed arc Arc	15. Ellipse 16. Arc
106. Copious Data: A MicroStation line string or shape element can have a maximum of 5000 vertices. If a copious data entity has more than 5000 vertices, it is translated as a complex chain or complex shape that contains multiple line strings. Form 11, 12, 40, 63 Form 20-21, 31-38	4. Line String, or 6. Shape, or 14. Complex Shape Line segments
108. Plane: Only bounded planes with a positive bounded area (form 1) are translated. In this case, the bounding curve is interpreted as closed. For example, if the bounding curve is a composite curve it is interpreted as a complex shape rather than a complex chain. bounded unbounded	43 Shape, Ellipse, closed B-spline Curve, or Complex Shape Not supported
110. Line	3. Line
112. Parametric Spline Curve	27. B-spline Curve
114. Parametric Spline Surface	24. B-spline Surface
116. Point	3. Line (zero length)
118. Ruled Surface Form 1 ruled surfaces are approximated as form 0. The parameterization of the ruled surfaces is always taken from the rail curves as specified in form 0.	24. B-spline Surface
120. Surface of Revolution	24. Default is Surface of Revolution. However, if the Surface header is excluded, the entity is translated into a B-spline Surface. You can exclude the Surface header by choosing Settings > Exclude uStn Elements in the Import IGES dialog.
122. Tabulated Cylinder	24. B-spline Surface
124. Transformation Matrix	Supported
126. Rational B-spline Curve (all forms)	27. B-spline Curve
128. Rational B-spline Surface (all forms)	24. B-spline Surface
130. Offset Curve	27. B-spline Curve
140. Offset Surface	24. B-spline Surface
142. Curve On A Parametric Surface Curve present uv_curve present	27. B-spline Curve 24. B-spline Surface Boundary
144. Trimmed Parametric Surface Trimmed parametric surface entities are translated to B-spline surface elements with boundaries. Since MicroStation supports only polygonal surface boundaries, curved boundaries are approximated by stroking the curves to polygons.	25. Bounded B-spline Surface if the 3D Design add-on is not present, or 3D Design boundary representation if 3D Design is present
150. Block	19. Solid (of projection)
152. Right Angular Wedge	19. Solid (of projection)
154. Right Circular Cylinder	23. Cylinder
156. Right Circular Cone Frustum	23. Cone
158. Sphere	19. Solid (of revolution)
160. Torus	19. Solid (of revolution)
162. Solid of Revolution	19. Solid (of revolution) 24. B-spline Surface (if cross-section is a B-spline curve)
164. Solid of Linear Extrusion	19. Solid (of projection) 24. B-spline Surface (if cross-section is a B-spline curve)
186. Manifold Solid B-rep Object	Type 2 SmartSolids
202. Angular Dimension	Angular Dimension or primitive elements, such as lines or text.
206. Diameter Dimension	Diameter Dimension or primitive elements, such as lines or text.
208. Flag Note	Flag Note or primitive elements, such as lines or text.
210. General Label	General Label or primitive elements, such as lines or text.
212. General Note — Forms 0-8, 100-102, 105	17. Text
214. Leader	Leader or primitive elements, such as lines or text.
216. Linear Dimension	Linear Dimension or primitive elements, such as lines or text.
218. Ordinate Dimension	Ordinate Dimension or primitive elements, such as lines or text.
220. Point Dimension	Primitive elements, such as lines or text
222. Radius Dimension	Radius Dimension or primitive elements, such as lines or text.
228. General Symbol	General Symbol or primitive elements, such as lines or text.
230. Sectioned Area	Boundary elements enclosing a hatch pattern.
308. Subfigure Definition The Subfigure Output control in the IGES Import Settings dialog sets how subfigures are translated. If no cell library is attached, Subfigure Output is set to shared cells.	1. Cell (in attached cell library) 34. Shared Cell Definition
312. Text Display Template	Supported
314. Color Definition	Supported
320. Network Subfigure Definition The Subfigure Output control in the IGES Import Settings dialog sets how subfigures are translated. If no cell library is attached, Subfigure Output is set to shared cells.	1. Cell (in attached cell library) 34. Shared Cell Definition
402. Associativity Instance: Form 1, 7, 9, 13, 14, 15, 16, 18 Form 3, 4 The Drawings control in the IGES Import Settings dialog sets how view visibility is handled. See also Drawing sheets and view visibility.	Graphic Group Supported (view visibility)
404. Drawing The Drawings control in the IGES Import Settings dialog sets whether drawing entities are ignored, merged into the DGN file, or have a sheet file created with appropriate attached views. See also Drawing sheets and view visibility.	Supported
406. Property: Form 3. (level function) Form 5. (line widening) Form 15. (name) Form 16. (drawing size) Form 17. (drawing units)	Named level 36. Multi-line Supported View in sheet DGN file Units in sheet DGN file
408. Singular Subfigure Instance The Subfigure Output control in the IGES Import Settings dialog sets how subfigures are translated. If no cell library is attached, Subfigure Output is set to shared cells.	2. Cell (placed in attached cell library) 35. Shared Cell Instance
410. View	5. Saved View
412. Rectangular Array Subfigure Instance The Subfigure Output control (IGES Import Settings dialog) sets how subfigures are translated. If no cell library is attached, Subfigure Output is set to shared cells.	2. Cell(s) (placed in a rectangular array in attached cell library) 35. Shared Cell Instance(s) (placed in a rectangular array)
414. Circular Array Subfigure Instance The Subfigure Output control (IGES Import Settings dialog) sets how subfigures are translated. If no cell library is attached, Subfigure Output is set to shared cells.	2. Cell(s) (placed in a circular array in attached cell library) 35. Shared Cell Instance(s) (placed in a circular array)
416. External Reference (Form 1)	5. Reference
420. Network Subfigure Instance The Subfigure Output control in the IGES Import Settings dialog sets how subfigures are translated. If no cell library is attached, Subfigure Output is set to shared cells.	2. Cell (in attached cell library) 35. Shared Cell Instance