By the way, the isosurface() object in the BLOCK macro has a max_gradient value
that's really difficult to nail down, for some reason; it's either too high or
too low for any particular individual block object. The result is that the macro
generates hundreds (thousands?!) of 'warning' messages, at the end of a render--
maybe a message for each block! I had to invoke "All_Console=off" in my
resolution .ini file, to supress them. Maybe the blocks are not 'rounded'
enough, and are causing steep-slope max_gradient errors(?)

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