add initial components and utility functions for simulation and builder modules

app/src/modules/builder/eventFunctions/handleMeshMissed.ts

@@ -0,0 +1,34 @@
+import * as THREE from 'three';
+import * as Types from "../../../types/world/worldTypes";
+
+function handleMeshMissed(
+    currentWallItem: Types.RefMesh,
+    setSelectedWallItem: Types.setSelectedWallItemSetState,
+    setSelectedItemsIndex: Types.setSelectedItemsIndexSetState
+): void {
+
+    //////////  If an item is selected and then clicked outside other than the selected object, this runs and removes the color of the selected object and sets setSelectedWallItem and setSelectedItemsIndex as null  //////////
+
+    if (currentWallItem.current) {
+        currentWallItem.current.children.forEach((child) => {
+            if ((child as THREE.Mesh).isMesh && child.name !== "CSG_REF") {
+                const material = (child as THREE.Mesh).material;
+
+                if (Array.isArray(material)) {
+                    material.forEach(mat => {
+                        if (mat instanceof THREE.MeshStandardMaterial) {
+                            mat.emissive = new THREE.Color("black");
+                        }
+                    });
+                } else if (material instanceof THREE.MeshStandardMaterial) {
+                    material.emissive = new THREE.Color("black");
+                }
+            }
+        });
+        currentWallItem.current = null;
+        setSelectedWallItem(null);
+        setSelectedItemsIndex(null);
+    }
+}
+
+export default handleMeshMissed;