Add support for surfaces generated via extrusion - fixes #9

src/on2json/on2json.cpp

@@ -83,6 +83,9 @@ bool on2json(std::string &fileName, Config &cfg, std::string &jsonString)
                     case ON::brep_object:
                         extractBrepData(geometry, cfg, data);
                         break;
+                    case ON::extrusion_object:
+                        extractExtrusionData(geometry, cfg, data);
+                        break;
                     }
                 }
                 // Only add to the array if JSON output is not empty

src/rw3dm/rw3dm.cpp

@@ -209,6 +209,24 @@ void extractSurfaceData(const ON_Geometry* geometry, Config &cfg, Json::Value &d
     }
 }
 
+void extractExtrusionData(const ON_Geometry* geometry, Config& cfg, Json::Value& data)
+{
+    // We expect an extrusion object
+    if (ON::object_type::extrusion_object != geometry->ObjectType())
+        return;
+
+    // We know that "geometry" is an extrusion object
+    ON_Extrusion* extr = (ON_Extrusion*)geometry;
+
+    // Try to get the NURBS surface form of the extrusion object
+    ON_NurbsSurface nurbsSurface;
+    if (extr->NurbsSurface(&nurbsSurface))
+    {
+        // Extract NURBS surface data
+        extractNurbsSurfaceData(&nurbsSurface, cfg, data);
+    }
+}
+
 void extractBrepData(const ON_Geometry* geometry, Config &cfg, Json::Value &data)
 {
     // We expect a BRep object

src/rw3dm/rw3dm.h

@@ -36,6 +36,7 @@ void extractCurveData(const ON_Geometry *, Config &, Json::Value &, double * = n
 void extractNurbsSurfaceData(const ON_NurbsSurface *, Config &, Json::Value &);
 void extractSurfaceData(const ON_Geometry *, Config &, Json::Value &);
 void extractBrepData(const ON_Geometry *, Config &, Json::Value &);
+void extractExtrusionData(const ON_Geometry*, Config&, Json::Value&);
 
 // Geometry conversion (geomdl -> 3DM)
 void constructCurveData(Json::Value &, Config &, ON_NurbsCurve *&);