spawn at specific location on a mesh in a new level selected by line trace to the scaled down version of the mesh

hi
i am working on a vr app, i have a photoscanned mesh scaled down on a table and i want to point my controller to a location on the mesh and spawn at that location in a new level on that mesh which will be in its original size on that new level.
i cant figure out a way to do this, dont know how i will capture the coordinates on scaled down mesh and translate that to the new level
please help!!