Hi Ben, All that I meant by mask is, in this case, an r3 map that defines a subset of space that subsequent operations are constrained to. I guess I was just expressing worry about creating runaway data demands.The region settings act as a three dimensional bounding cube, does not seem adequate to constrain a tiling scheme with relatively sparse data.In the compromise scenario that Dylan suggested with 10 meter xy and 1 cm z resolution and 1 meter depth we would be looking at populating 10000 voxels per hectare for a flat landscape. However if we were using a simple bounding box to define the region and we had 5 meters of relief we would end up with 50000 or 60000 voxels. As the area of coverage gets bigger cost of the range in z values gets worse.
Tim
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