, 125);
                topPlaneMesh.rotation.x = MathUtils.degToRad(-90);
                this.add(topPlaneMesh);

                const topTri = new BufferGeometry();
                topTri.setAttribute('position', new Float32BufferAttribute([0, 0, 0, 50, 0, 0, 0, 50, 0], 3));
                topTri.setAttribute('uv', new Float32BufferAttribute([0, 0, 1, 0, 0, 1], 2));
                topTri.computeVertexNormals();
                const topTriMesh = new Mesh(topTri, material);
                topTriMesh.p