Interactive lighting and new shader

[JMR]

Hi Agisoft team:
The ability to move interactively the light source both in the DEM view and in the model view would be very welcome. Sometimes raking lighting helps a lot to show 3D features that are hardly visible.
Also, It would be very nice to have another render mode for the monochrome 3D model similar to the radiance scaling shader like we have in Meshlab.

Best regards,
Geobit