dxf writer placeholder

ACadSharp/IO/DXF/DxfStreamWriter/DxfSectionWriterBase.Entities.cs

@@ -14,7 +14,6 @@ protected void writeEntity<T>(T entity)
 			switch (entity)
 			{
 				case Hatch:
-				case Mesh:
 				case Ray:
 				case Shape:
 				case Solid3D:
@@ -61,6 +60,9 @@ protected void writeEntity<T>(T entity)
 				case LwPolyline lwPolyline:
 					this.writeLwPolyline(lwPolyline);
 					break;
+				case Mesh mesh:
+					this.writeMesh(mesh);
+					break;
 				case MLine mline:
 					this.writeMLine(mline);
 					break;
@@ -511,6 +513,15 @@ private void writeLwPolyline(LwPolyline polyline)
 			this._writer.Write(210, polyline.Normal, map);
 		}
 
+		private void writeMesh(Mesh mesh)
+		{
+			DxfClassMap map = DxfClassMap.Create<Mesh>();
+
+			this._writer.Write(DxfCode.Subclass, DxfSubclassMarker.Mesh);
+
+			this._writer.Write(71, (short)mesh.Version, map);
+		}
+
 		private void writeMLine(MLine mLine)
 		{
 			DxfClassMap map = DxfClassMap.Create<MLine>();