When a user clicks on a mesh object placed on the floor, I want to rotate it so that it aligns with the surface. While I can successfully detect the click and select the mesh, I am struggling with figuring out how to manipulate the face in order to achieve this rotation.
It's difficult to provide a clear answer without a code example, but it seems like you are searching for:
Utilize Raycaster intersectObject to determine both the mesh and face that is being clicked on;
Find the rotation of the face by examining the face normal vector. Remember to call Geometry.computeFaceNormals() before using it if you manually constructed your mesh
Rotate the mesh around the center of the face to the angle, which can be calculated from the face normal vector. A simple method to rotate around Vector3 can be found here
I hope this information proves useful.
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