This Rhinoceros V6/V7 plugin creates a high precision grayscale 16 bit tiff file with the heightmap representation of the selected mesh using a single surface as reference for depth calculation. The projection is perpendicular to the surface. It uses the libtiff library by BitMiracle: https://github.com/BitMiracle/libtiff.net
launch plugin with the MeshToTiff command
select a single reference surface
select a single mesh to calculate
set tiff image size in pixels
set the depth of the black color (anything over this value will be truncated to black)
set the default depth (depth of the pixels where the mesh faces are not present)
if the projection creates multiple points with this option you can choose if you want to use the nearest or the furthest one for the grayscale level calculation.