Appendix I: Known Limitations

The following are some of the limitations of Gateway for 2D Data:

Limitation for MicroStation 2D

The Gateway does not support the extraction of referenced Excel files from MicroStation 2D.

Limitations for both AutoCAD 2D and MicroStation 2D

The AutoCAD and MicroStation applications can scale line styles as you zoom in or zoom out in a drawing. In contrast, the SVG file does not support dynamic line styles.

• A DGN input file containing a circle and dotted circle is zoomed in MicroStation 2D Gateway. Because of the line style limitations in the SVG, the Gateway does not export the input file in SVG accurately. The output SVG shows a broken circle.

  

• A DGN input file containing circle with four inner lines is zoomed out in MicroStation 2D Gateway. Because of the line style limitations in the SVG, the Gateway does not export the input file in SVG accurately. The output SVG shows a hexagon in place of a circle.

  

Limitation Supporting Non-English User Locales

When the Gateway is installed on a system where the user has selected a non-English locale that uses a comma as the decimal separator (that is, a number 123.45 in a Windows system with a French locale would be expressed as 123,45), the Gateway does not interpret such numbering formats from input sources and configurations nor does it export them into output files. This also applies to DEXPI extractions.

Extracting from Drawing/Model Issues for AutoCAD 2D Extractor

Input drawings or models are usually not exported correctly if they contain custom/proxy objects. Processing these input drawings/models results in missing graphics in SVG and engineering information for parts represented by these custom/proxy objects.

To process DWG files containing custom/proxy objects:

1. Save these drawings/models to the native AutoCAD DWG format.

   You can use an Object Enabler (program supplied by the creator of the objects), to read (open) these custom objects in AutoCAD. You can also use specific commands of the Object Enabler to convert the proxy objects to native objects before writing out to a new DWG file.

Extracting from Drawing/Model Issues for MicroStation 2D Gateway

It is observed that the processing of a few MicroStation 2D drawings is failing due to the following reasons:

• In some drawings the default view is not set to any of the 8 views and therefore the output is a blank SVG.

• In some drawings there are large entities (with large extents) so that when the default view is ‘zoom to extents’ the drawing appears very, very small, so in the SVG the drawing is shown as a very small dot and it is difficult to zoom into it.

To process such drawings using the MicroStation 2D extractor, you need to manually correct these drawings:

2. Open the file in the MicroStation application.

3. Fit the drawing contents manually within the MicroStation level view window or use the ‘Fit View’ button, whichever is applicable, so that all entities fit within the view.

4. Click File > Save Settings.

5. Click File > Save.

6. Click File > Save As and save as ‘MicroStation DGN files’.

7. Rename the file if needed and click Save.

8. The drawing file may now be processed using the Gateway.

SVG Rendering Issues

You may observe performance issues during the rendering of SVG content on Internet browsers while processing large graphics files. After loading the graphics to the SVG viewer, slow response is observed for zoom and pan operations. In some cases, this may lead to a lack of response or a crash of the application. If hardware acceleration is not fully supported by the computers, you may observe these issues.

Hardware acceleration within a browser passes most of the graphics intensive tasks to the Graphical Processing Units (GPU). You can modify the browser settings in the following way to fix the SVG rendering issues:

• Select the Use software rendering instead of GPU rendering option under Internet Options, Advanced, Accelerated Graphics section.

• Deselect Use hardware acceleration when available option under Internet Options, Advanced, Systems section.