The majority of formats require the same two steps for visualization on a Lightspeed view. To visualize DGN data:

  1. Decode the data into an ILcdModel using an ILcdModelDecoder.

  2. Create an ILspLayer for the ILcdModel and add it to the ILspView. 

//First create the model
ILcdModelDecoder decoder =
    new TLcdCompositeModelDecoder(TLcdServiceLoader.getInstance(ILcdModelDecoder.class));
ILcdModel model = decoder.decode("Data/Dgn/world.dgn");

//Create the layers for the model with default styling
Collection<ILspLayer> layers = new TLspDGNLayerFactory().createLayers(model);
//The layerFactory creates one single layer
ILspLayer layer = layers.iterator().next();

//Add the layer to the Lightspeed view (an ILspView)
view.addLayer(layer);

This results in a DGN layer with default styling. See Visualizing Vector Data for more information about visualizing and styling vector data.

This code snippet uses the TLcdCompositeModelDecoder, initialized with all model decoders available in the service registry.

The model decoder class that is actually responsible for decoding DGN data is the TLcdDGNModelDecoder.