I’m adding an augmented-reality feature to my mobile app and need a simple, working prototype that drops a random 3D object onto whatever horizontal surface the camera detects. What I need right now is the core logic, not a polished production build. The feature should: • Open the device camera, find a plane, and anchor a single 3D asset at a believable scale and orientation. • Choose that asset at random from a list or folder I can update easily (FBX, OBJ, USDZ—whatever your chosen framework supports) or a created in-app one. • Keep the code clean, well commented, and delivered with a short read-me explaining how to plug the module into my existing project. If it’s possible within this scope, I’d also like: • Basic gestures to reposition or rotate the object. • One button that spawns a new random object. • Cross-platform support (iOS and Android via ARKit/ARCore abstraction such as Unity, RealityKit, AR Foundation, or a comparable tool). When you respond, please tell me which framework you prefer and share links or clips of any similar AR work you’ve shipped. My priority is straightforward implementation I can build on later, so concise, well-structured code and clear setup instructions are essential.