Mesh Ray

All,

I am trying to use Mesh Ray to create an intersection point only if there are no obstacle surfaces between the target surface and the source point grid, and then report back to the grid, changing color for true/false. The reason for using Mesh Ray is as a 3D isovist.

However...Mesh Ray intersects through all obstacle surfaces, not providing a clear reading of whether there is direct line of sight between source and target.

What would you recommend?

Regards, Arpan