ccp4 map axis order

[wojdyr]

Reading ccp4 maps works only for some axis orders.
It's because C,R,S to X,Y,Z mapping is used instead of the opposite (X,Y,Z to C,R,S).
So it works if axis order is for instance XYZ, ZYX or YXZ, but it doesn't work with YZX, etc.
If you'd like to test it, the axes can be reordered using ccp4 mapmask:

  mapmask mapin 1mru_2mFo-DFc.ccp4 mapout 1mru_yzx.ccp4 << eof
  AXIS Y Z X
  MODE mapin
  eof

I'm opening this issue just for the record.
I made a fork of the viewer that looks like coot (it diverged from xtal.js quite far by now):
https://github.com/uglymol/uglymol
and I fixed it there.

[wojdyr]

sorry for this plug. i'd like to mention
a new webGL molecular viewer project called gemmimol:
it's a minimalistic project with a small typescript6 code base that should be easy to understand and experiment with. at the same time it's fast and mostly correct, handles symmetry, mmCIF, MTZ,and uses CIF files for bonds, instead of guessing bonds from distanceslike uglymol
demo: https://gemmimol.github.io/
features: https://github.com/gemmimol/gemmimol/releases