IExportContextOnMaterial Method

void OnMaterial(
	MaterialNode node
)

Sub OnMaterial ( 
	node As MaterialNode
)

void OnMaterial(
	MaterialNode^ node
)

abstract OnMaterial : 
        node : MaterialNode -> unit 

ElementId currentMaterialId = ElementId.InvalidElementId;
Color currentColor = new Color(0,0,0);
double currentTransparency = 0;
Asset currentAppearance = null;

/// <summary>
/// This code demonstrates how to process material information
/// </summary>
/// <remarks>
/// OnMaterial method can be invoked for every single out-coming mesh
/// even when the material has not actually changed. Thus it is usually
/// beneficial to store the current material and only get its attributes
/// when the material actually changes.
/// </remarks>
public void OnMaterial(MaterialNode node)
{
   // acquire properties of the material if it is different
   // than the material we have set as the currently applicable
   if (currentMaterialId != node.MaterialId)
   {
      if (node.MaterialId != ElementId.InvalidElementId)
      {
         currentColor = node.Color;
         currentTransparency = node.Transparency;
      }
      else
      {
         // the default material is being used in this case
      }

      // Appearance Asset is mainly for Revit internal use. However, if it is utilized 
      // in the export context, it needs to be checked whether or not the asset of the 
      // material is overridden by some local modification (e.g. by applying a decal)

      if (node.HasOverriddenAppearance)
      {
         currentAppearance = node.GetAppearanceOverride();
      }
      else
      {
         currentAppearance = node.GetAppearance();
      }
   }
}