Workaround extruction non-solid issue

packages/base/src/3dview/helpers.ts

@@ -112,13 +112,14 @@ export function buildShape(options: {
   data: IParsedShape;
   clippingPlanes: THREE.Plane[];
   selected: boolean;
+  isSolid: boolean;
   guidata?: IDict;
 }): {
   meshGroup: THREE.Group;
   mainMesh: THREE.Mesh<THREE.BufferGeometry, THREE.MeshPhongMaterial>;
   edgesMeshes: LineSegments2[];
 } | null {
-  const { objName, data, guidata, clippingPlanes, selected } = options;
+  const { objName, data, guidata, isSolid, clippingPlanes, selected } = options;
   const { faceList, edgeList, jcObject } = data;
 
   const vertices: Array<number> = [];
@@ -191,34 +192,39 @@ export function buildShape(options: {
   meshGroup.name = `${objName}-group`;
   meshGroup.visible = visible;
 
-  const baseMat = new THREE.MeshBasicMaterial();
-  baseMat.depthWrite = false;
-  baseMat.depthTest = false;
-  baseMat.colorWrite = false;
-  baseMat.stencilWrite = true;
-  baseMat.stencilFunc = THREE.AlwaysStencilFunc;
-
-  // back faces
-  const mat0 = baseMat.clone();
-  mat0.side = THREE.BackSide;
-  mat0.clippingPlanes = clippingPlanes;
-  mat0.stencilFail = THREE.IncrementWrapStencilOp;
-  mat0.stencilZFail = THREE.IncrementWrapStencilOp;
-  mat0.stencilZPass = THREE.IncrementWrapStencilOp;
-  const backFaces = new THREE.Mesh(geometry, mat0);
-  backFaces.name = `${objName}-back`;
-  meshGroup.add(backFaces);
-
-  // front faces
-  const mat1 = baseMat.clone();
-  mat1.side = THREE.FrontSide;
-  mat1.clippingPlanes = clippingPlanes;
-  mat1.stencilFail = THREE.DecrementWrapStencilOp;
-  mat1.stencilZFail = THREE.DecrementWrapStencilOp;
-  mat1.stencilZPass = THREE.DecrementWrapStencilOp;
-  const frontFaces = new THREE.Mesh(geometry, mat1);
-  frontFaces.name = `${objName}-front`;
-  meshGroup.add(frontFaces);
+  // We only build the stencil logic for solid meshes
+  if (isSolid) {
+    const baseMat = new THREE.MeshBasicMaterial();
+    baseMat.depthWrite = false;
+    baseMat.depthTest = false;
+    baseMat.colorWrite = false;
+    baseMat.stencilWrite = true;
+    baseMat.stencilFunc = THREE.AlwaysStencilFunc;
+
+    // back faces
+    const mat0 = baseMat.clone();
+    mat0.side = THREE.BackSide;
+    mat0.clippingPlanes = clippingPlanes;
+    mat0.stencilFail = THREE.IncrementWrapStencilOp;
+    mat0.stencilZFail = THREE.IncrementWrapStencilOp;
+    mat0.stencilZPass = THREE.IncrementWrapStencilOp;
+    const backFaces = new THREE.Mesh(geometry, mat0);
+    backFaces.name = `${objName}-back`;
+    meshGroup.add(backFaces);
+
+    // front faces
+    const mat1 = baseMat.clone();
+    mat1.side = THREE.FrontSide;
+    mat1.clippingPlanes = clippingPlanes;
+    mat1.stencilFail = THREE.DecrementWrapStencilOp;
+    mat1.stencilZFail = THREE.DecrementWrapStencilOp;
+    mat1.stencilZPass = THREE.DecrementWrapStencilOp;
+    const frontFaces = new THREE.Mesh(geometry, mat1);
+    frontFaces.name = `${objName}-front`;
+    meshGroup.add(frontFaces);
+  } else {
+    material.side = THREE.DoubleSide;
+  }
 
   const mainMesh = new THREE.Mesh(geometry, material);
   mainMesh.name = objName;

packages/base/src/3dview/mainview.tsx

@@ -585,11 +585,19 @@ export class MainView extends React.Component<IProps, IStates> {
 
     Object.entries(payload).forEach(([objName, data]) => {
       const selected = selectedNames.includes(objName);
+      const obj = this._model.sharedModel.getObjectByName(objName);
+
+      // TODO Have a more generic way to spot non-solid objects
+      const isSolid = !(
+        obj!.shape === 'Part::Extrusion' && !obj!.parameters?.['Solid']
+      );
+
       const output = buildShape({
         objName,
         data,
         clippingPlanes: this._clippingPlanes,
         selected,
+        isSolid,
         guidata
       });