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# PVOL.H -- PVOL definitions.
define COL 1 # image column index
define LINE 2 # image line index
define BAND 3 # image band index
define DIS (sqrt (($1)*($1) + ($2)*($2)))
define DRADIAN (57.295779513082320877D0)
define DDEGTORAD (double($1)/DRADIAN)
define DRADTODEG (double($1)*DRADIAN)
define DPI 3.1415926535897932385D0
define DTWOPI 6.2831853071795864769D0
define DHALFPI 1.5707963267948966192D0
define DTHREEPIOVER2 (1.5D0 * DPI)
define DEF_IMIN (0.0)
define DEF_IMAX (1.0)
define ALG_INCREM 1 # incremental dda proj. algor.
define ALG_BRESEN 2 # bresenham dda proj. algor.
define ALG_MATRIX 3 # rotation matrix prol. algor.
define P_ATTENUATE 1 # attenuate by voxval (opacity)
define P_AVERAGE 2 # average projected intensities
define P_SUM 3 # sum voxel intensities
define P_INVDISPOW 4 # wt int. by inverse dis power
define P_MODN 5 # use only f(ndecades) voxels
define P_LASTONLY 6 # use only last voxval > cutoff
# Volume rotation descriptor
define LEN_VP 30
# Projection geometry elements:
define P_ALGORITHM Memi[$1] # Projection algorithm
define DEGREES Memr[P2R($1+1)] # Degrees per rotation increment
define NFRAMES Memi[$1+2] # Number of rotation increments
define VECX Memr[P2R($1+3)] # Rotation axis X vector
define VECY Memr[P2R($1+4)] # Rotation axis Y vector
define VECZ Memr[P2R($1+5)] # Rotation axis Z vector
define INIT_THETA Memr[P2R($1+6)] # Initial rotation angle
define MAX_WS Memi[$1+7] # Maximum working set size
# reserved space
# Light transmission elements:
define OPACELEM Memi[$1+10] # Opacity element in 4th dimen
define PTYPE Memi[$1+11] # Projection type, voxel val 1
define OMIN Memr[P2R($1+12)] # Voxel opacity minimum
define OMAX Memr[P2R($1+13)] # Voxel opacity maximum
define OSCALE Memr[P2R($1+14)] # Opacity scale factor
define AMIN Memr[P2R($1+15)] # Attenuation factor minimum
define AMAX Memr[P2R($1+16)] # Attenuation factor maximum
define VIMIN Memr[P2R($1+17)] # Voxel intensity minimum
define VIMAX Memr[P2R($1+18)] # Voxel intensity maximum
define IZERO Memr[P2R($1+19)] # Background illumination
define DISPOWER Memr[P2R($1+20)] # Distance weighting power
define MODN Memi[$1+21] # Use vox w/ (mod(val*100,modn))
define IIMIN Memr[P2R($1+22)] # Input intensity minimum
define IIMAX Memr[P2R($1+23)] # Input intensity maximum
define VERBOSE Memi[$1+24] # Write verbose output?
define DISCUTOFF Memi[$1+25] # Measure distance w/in cutoffs
# reserved space
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