Vector displacement maps are usually baked from a high resolution model onto a low resolution model. It would be hard to capture a vector displacement map with laser scanning because the laser would be blocked by any overhang in the scanned object’s surface. The only scanning that I believe could be practically baked to a vector displacement map is photogrammetry, as you could scan the object, then retopologize it, and bake the vector displacement map from the scan to the retopologize mesh.
