PJ 3Q - Project - 3D volume using Eulerian angles ||

PURPOSE

Computes projection(s) of a 3D volume according to the three Eulerian angles.

SEE ALSO

PJ 3	[Project - 3D volume]
PJ 3Q RR	[Project - 3D volume using Eulerian angles & create rings file ||]
PJ 3Q O	[Project - 3D volume using Eulerian angles (older version) ||]
PJ AT	[Project - 3D volume using exponential Attenuation]
PJ CYL	[Project - 3D volume onto Cylinder]
RT SQ	[Rotate and Shift - image, Quadratic interpolation ||]

USAGE

.OPERATION: PJ 3Q

.3-D INPUT FILE: vol001
[Enter the name of the volume whose projections are to be computed. This should be a cube!]

.RADIUS OF THE OBJECT: 26.0
[The projections are computed only for the object inside the sphere of the given radius.]

.ENTER ANGLE NUMBERS OR SELECTION DOC. FILE NAME: 1-700 or SEL001
[Enter selected angle numbers or name of a document file containing the selected angle numbers. Projections will only be calculated for the selected sets of angles from the following angles doc. file. (If you use a selection doc. file here then the selected numbers are taken from the first register in the doc. file.)]

.ANGLES DOC. FILE: ANGLES
[Enter the name of the document file containing the Eulerian angles for the projections. The angles have to be given in the order: psi, theta, phi. The meaning of the angles is the same as in operation 'RT SQ'. Projections will be calculated for every entry specified in the previous question.]

.ENTER TEMPLATE FOR 2-D PROJECTIONS: PRJ****
[Enter the template for the output files which will contain the 2-D projections.]

NOTES

1. Memory requirements: NSAM*NROW+12*R**3+15*R**2, where R is the radius, but no more than: 6*NSAM*NROW+NSAM*NROW*NSLICE

2. The projection file has always dimensions NSAM x NROW.

3. For a projection of the whole volume (not the internal sphere only) give a radius larger than any linear dimension of the volume. Please note that usually such a projection is incorrect and the program takes much longer!

4. Implemented by: P.Penczek.

5. Improved anti-aliasing Sept 2003. For old version use 'PJ 3Q 0'

6. Psi, theta, & phi angles are placed in file header starting at location: 100

SUBROUTINES

PJ3Q_N, PREPCUB_Q_N, WRITPRO_N, WPRO_N

CALLER

VTIL2