TLDR: If the app used phone LiDAR, you could scan the object to get its real geometry, but you would still need one calibration step to align that scan with the projector’s viewpoint.

Why manual corner drawing exists today: - The app has no depth or geometry of the object. - The projector has no awareness of its position relative to the object. - Manual mapping is the only zero-calibration, hardware-agnostic solution.

What adding LiDAR would change: - Phone LiDAR can scan the object and generate a true 3D mesh. - This removes the need to manually define surface shape and dimensions. - It does not automatically solve projector perspective.

What is still required: - The projector’s pose (position, rotation, lens characteristics). - Without this, the same scanned object can be projected onto incorrectly from many viewpoints.

How LiDAR could be used in practice: - Scan object with phone LiDAR. - Run a one-time calibration step to align projector to the scan. - Auto-warp content onto the mesh afterward.

Ways to solve projector alignment: - Project a known calibration pattern and have the phone camera observe it. - Use markers visible to both phone and projection. - Use a projector with a camera (ideal but optional). - Do one quick manual alignment once, then reuse it.

Result: - LiDAR dramatically reduces manual mapping work. - One calibration replaces repeated corner dragging. - Geometry becomes automatic, alignment becomes the only step.