diff --git a/visualization/app/codeCharta/services/3DExports/serialize3mf.service.spec.ts b/visualization/app/codeCharta/services/3DExports/serialize3mf.service.spec.ts
index fd66cc1728..d47b22c198 100644
--- a/visualization/app/codeCharta/services/3DExports/serialize3mf.service.spec.ts
+++ b/visualization/app/codeCharta/services/3DExports/serialize3mf.service.spec.ts
@@ -62,7 +62,8 @@ describe("serialize3mf service", () => {
             vertexIndexToNewVertexIndex = new Map()
             vertexIndexes = [0, 1, 2]
             testMesh = new Mesh()
-            testMesh.geometry.attributes["position"] = new BufferAttribute(new Float32Array(testVertexPositions), 3, false)
+            testMesh.geometry.attributes["position"] = new BufferAttribute(new Float32Array(testVertexPositions), 3)
+            testMesh.matrix.makeScale(2, 2, 2)
         })
 
         it("should create correct vertex entries", () => {
@@ -72,6 +73,56 @@ describe("serialize3mf service", () => {
             expect(vertexIndexToNewVertexIndex.size).toBe(3)
             expect(vertexToNewVertexIndex.size).toBe(3)
             expect([...vertexToNewVertexIndex.keys()].toString()).toBe(vertices.toString())
+            const expectedPositions = [
+                [0, 0, 0],
+                [4, 0, 0],
+                [0, 4, 0]
+            ]
+            for (const xyzPos of expectedPositions) {
+                expect(vertices).toContain(`<vertex x="${xyzPos[0]}" y="${xyzPos[1]}" z="${xyzPos[2]}"/>`)
+            }
+        })
+
+        it("should apply parent matrix if present", () => {
+            parentMatrix = new Matrix4()
+            parentMatrix.setPosition(1, 1, 1)
+
+            constructVertices(vertices, vertexToNewVertexIndex, vertexIndexToNewVertexIndex, vertexIndexes, testMesh, parentMatrix)
+
+            expect(vertices).toHaveLength(3)
+            expect(vertexIndexToNewVertexIndex.size).toBe(3)
+            expect(vertexToNewVertexIndex.size).toBe(3)
+            expect([...vertexToNewVertexIndex.keys()].toString()).toBe(vertices.toString())
+            const expectedPositions = [
+                [1, 1, 1],
+                [5, 1, 1],
+                [1, 5, 1]
+            ]
+            for (const xyzPos of expectedPositions) {
+                expect(vertices).toContain(`<vertex x="${xyzPos[0]}" y="${xyzPos[1]}" z="${xyzPos[2]}"/>`)
+            }
+        })
+
+        it("should not add new entries to indexLookup but vertexLookup if repeated information", () => {
+            const testDoubleVertexPositions = [...testVertexPositions, ...testVertexPositions]
+            const doubleMesh = new Mesh()
+            doubleMesh.geometry.attributes["position"] = new BufferAttribute(new Float32Array(testDoubleVertexPositions), 3)
+            const longerIndex = [1, 2, 3, 4, 5, 6]
+
+            constructVertices(vertices, vertexToNewVertexIndex, vertexIndexToNewVertexIndex, longerIndex, doubleMesh, parentMatrix)
+
+            expect(vertices).toHaveLength(3)
+            expect(vertexIndexToNewVertexIndex.size).toBe(6)
+            expect(vertexToNewVertexIndex.size).toBe(3)
+            expect([...vertexToNewVertexIndex.keys()].toString()).toBe(vertices.toString())
+            const expectedPositions = [
+                [0, 0, 0],
+                [2, 0, 0],
+                [0, 2, 0]
+            ]
+            for (const xyzPos of expectedPositions) {
+                expect(vertices).toContain(`<vertex x="${xyzPos[0]}" y="${xyzPos[1]}" z="${xyzPos[2]}"/>`)
+            }
         })
     })