diff --git a/packages/base/src/3dview/mainview.tsx b/packages/base/src/3dview/mainview.tsx
index 3588f6e2..013a810d 100644
--- a/packages/base/src/3dview/mainview.tsx
+++ b/packages/base/src/3dview/mainview.tsx
@@ -583,6 +583,7 @@ export class MainView extends React.Component<IProps, IStates> {
 
     this._meshGroup = new THREE.Group();
 
+    console.log(payload);
     Object.entries(payload).forEach(([objName, data]) => {
       const selected = selectedNames.includes(objName);
       const output = buildShape({
@@ -737,6 +738,7 @@ export class MainView extends React.Component<IProps, IStates> {
       this.setState(old => ({ ...old, loading: false }));
     }
   }
+
   private async _requestRender(
     sender: MainViewModel,
     renderData: {
@@ -790,6 +792,7 @@ export class MainView extends React.Component<IProps, IStates> {
       });
     }
   }
+
   private _updatePointers(refLength): void {
     this._pointerGeometry = new THREE.SphereGeometry(refLength / 10, 32, 32);
 
diff --git a/packages/occ-worker/src/occparser.ts b/packages/occ-worker/src/occparser.ts
index 8e571ed7..0b1a3422 100644
--- a/packages/occ-worker/src/occparser.ts
+++ b/packages/occ-worker/src/occparser.ts
@@ -51,6 +51,7 @@ export class OccParser {
         jcObject,
         faceList,
         edgeList: [...edgeList, ...wireList],
+        isSolid: this._isSolid(occShape),
         meta: metadata
       };
     });
@@ -58,6 +59,48 @@ export class OccParser {
     return threejsData;
   }
 
+  private _isSolid(shape: OCC.TopoDS_Shape) {
+    console.log('try checking is solid');
+    if (
+      shape.ShapeType() == this._occ.TopAbs_ShapeEnum.TopAbs_SOLID ||
+      shape.ShapeType() == this._occ.TopAbs_ShapeEnum.TopAbs_SHELL
+    ) {
+      console.log('1');
+      try {
+        const classifier = new this._occ.BRepClass3d_SolidClassifier();
+        console.log('2');
+        classifier.Load(shape);
+
+        console.log('3');
+        // Define a point (doesn't need to be specific, as we only care if it's closed)
+        const point = new this._occ.gp_Pnt();
+        console.log('4');
+        classifier.Perform(point, 0);
+
+        console.log('5');
+        // Check if the point is inside, on the boundary, or outside the solid
+        if (
+          classifier.State() == this._occ.TopAbs_State.TopAbs_IN ||
+          classifier.State() == this._occ.TopAbs_State.TopAbs_ON
+        ) {
+          console.log('6');
+          return true; // The solid is closed
+        }
+      } catch (e) {
+        if (typeof e === 'number') {
+          const exceptionData = this._occ.OCJS.getStandard_FailureData(e);
+          console.log(
+            `That didn't work because: ${exceptionData.GetMessageString()}`
+          );
+        } else {
+          console.log('Unkown error');
+        }
+      }
+    }
+    console.log('61');
+    return false;
+  }
+
   private _shouldComputeEdge(obj: IJCadObject): boolean {
     if (obj.shape === 'Part::Any' && obj.parameters?.Type === 'STL') {
       return false;
diff --git a/packages/opencascade/build.yml b/packages/opencascade/build.yml
index 12675082..a3aa86b5 100644
--- a/packages/opencascade/build.yml
+++ b/packages/opencascade/build.yml
@@ -21,6 +21,8 @@ mainBuild:
     - symbol: BRepBuilderAPI_MakeVertex
     - symbol: BRepBuilderAPI_MakeWire
     - symbol: BRepBuilderAPI_ModifyShape
+    - symbol: BRepClass3d_SClassifier
+    - symbol: BRepClass3d_SolidClassifier
     - symbol: BRepFilletAPI_LocalOperation
     - symbol: BRepFilletAPI_MakeChamfer
     - symbol: BRepFilletAPI_MakeFillet
@@ -69,12 +71,14 @@ mainBuild:
     - symbol: Message_ProgressRange
     - symbol: NCollection_BaseList
     - symbol: NCollection_BaseMap
+    - symbol: OCJS
     - symbol: Poly_Array1OfTriangle
     - symbol: Poly_Connect
     - symbol: Poly_PolygonOnTriangulation
     - symbol: Poly_Triangle
     - symbol: Poly_Triangulation
     - symbol: RWStl
+    - symbol: Standard_Failure
     - symbol: Standard_Transient
     - symbol: StdPrs_ToolTriangulatedShape
     - symbol: STEPControl_Reader
@@ -83,6 +87,7 @@ mainBuild:
     - symbol: TColStd_Array1OfInteger
     - symbol: TopAbs_Orientation
     - symbol: TopAbs_ShapeEnum
+    - symbol: TopAbs_State
     - symbol: TopExp
     - symbol: TopExp_Explorer
     - symbol: TopLoc_Location
@@ -103,9 +108,7 @@ mainBuild:
     - symbol: XSControl_Reader
   emccFlags:
     - "-flto"
-    - "-fexceptions"
     - "-O3"
-    - "-sDISABLE_EXCEPTION_CATCHING=1"
     - "-sEXPORT_ES6=1"
     - "-sUSE_ES6_IMPORT_META=0"
     - "-sEXPORTED_RUNTIME_METHODS=['FS']"
@@ -115,3 +118,10 @@ mainBuild:
     - "-sLLD_REPORT_UNDEFINED"
     - "--no-entry"
     - "-sENVIRONMENT='web'"
+additionalCppCode: |
+  class OCJS {
+  public:
+    static Standard_Failure* getStandard_FailureData(intptr_t exceptionPtr) {
+      return reinterpret_cast<Standard_Failure*>(exceptionPtr);
+    }
+  };
diff --git a/packages/schema/src/interfaces.ts b/packages/schema/src/interfaces.ts
index e7a417c3..5de253eb 100644
--- a/packages/schema/src/interfaces.ts
+++ b/packages/schema/src/interfaces.ts
@@ -209,6 +209,7 @@ export interface IParsedShape {
   jcObject: IJCadObject;
   faceList: Array<IFace>;
   edgeList: Array<IEdge>;
+  isSolid: boolean;
   meta?: IDict;
   guiData?: IDict;
 }