nipy/PySurfer — pull request #11 by yarikoptic (2011-10-12 18:58:46+00:00)
Title: workaround: always cast floats in read_scalar_data to 64bit

otherwise leads to incorrect rendering (at least on Linux Debian)
and it is done directly in read_scalar_data so it is in effect for
add_contour_overlay as well as add_overlay