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DAMASK_EICMD
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using tolerances as in python results in invalid operations

This commit is contained in:
Martin Diehl 2020-07-13 22:48:08 +02:00
parent 696da9865b
commit 9f79faf819
1 changed files with 4 additions and 1 deletions
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src/rotations.f90
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@ -574,6 +574,7 @@ end function om2qu
!---------------------------------------------------------------------------------------------------
!> @author Marc De Graef, Carnegie Mellon University
!> @brief orientation matrix to Euler angles
!> @details Two step check for special cases to avoid invalid operations (not needed for python)
!---------------------------------------------------------------------------------------------------
pure function om2eu(om) result(eu)
@ -581,11 +582,13 @@ pure function om2eu(om) result(eu)
real(pReal), dimension(3) :: eu
real(pReal) :: zeta
if(dNeq(abs(om(3,3)),1.0_pReal,1.e-9_pReal)) then
if (dNeq(abs(om(3,3)),1.0_pReal,1.e-5_pReal)) then
zeta = 1.0_pReal/sqrt(1.0_pReal-om(3,3)**2.0_pReal)
eu = [atan2(om(3,1)*zeta,-om(3,2)*zeta), &
acos(om(3,3)), &
atan2(om(1,3)*zeta, om(2,3)*zeta)]
elseif(dNeq(abs(om(3,3)),1.0_pReal,1.e-8_pReal)) then
eu = [PI*.75_pReal,acos(math_clip(om(3,3),-1.0_pReal,1.0_pReal)),PI*.25_pReal]
else
eu = [atan2(om(1,2),om(1,1)), 0.5_pReal*PI*(1.0_pReal-om(3,3)),0.0_pReal ]
end if