There are many ways to achieve this:
*Mapping Object operator in 3ds Max 2010 and higher, which was part of PFlow Tools Box #1 before that:
*PFlow Tools Box #3 provides operators for looking up points on a surface and getting values like mapping coordinates and many other things (requires commercial version of Box #3 though).
*Script Operator could be used together with the rayMeshProjIntersectOps methods to find the closest face and get data from it (too complicated)
*Krakatoa Geometry Lookup operator (requires commercial version of Krakatoa, disabled in the Evaluation version)
*Krakatoa PRT Volume (works in the Evaluation version) could be used to generate the whole grid of particles to load into PFlow:
*PFlow Box #2 also has an option to fill a volume with a grid of particles.
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