**PURPOSE**- Computes a single projection (variable size) of a volume according to three Eulerian angles. Uses trilinear or FBS interpolation. Example.

**SEE ALSO****PJ 3Q**[Project - 3D volume using Eulerian angles, trilinear interpolation ||] **PJ 3F**[Project - 3D volume using Eulerian angles, FBS interpolation ||] **PJ AT**[Project - 3D volume using exponential Attenuation] **PJ CYL**[Project - 3D volume onto Cylinder]

**USAGE**- .OPERATION: PJ 3

- .INPUT VOLUME: PIC001

[Enter the name of the volume whose projection is to be computed.].PROJECTION DIMENSIONS.: 110, 78

[Enter the X dimension and (optional) Y dimension for the output projection. If the Y dimension = 0 then the Y dimension is chosen such that the X/Y ratio in the projection is the same as in the volume. Arbitrary dimensions can be used.].OUTPUT FILE: PRJ001

[Enter the name of the file where the projection is to be stored.].PHI, THETA, PSI: 45.5, 27.2, -30.0

[Enter the phi, theta & psi angles, in degrees.**]**

**NOTES**

- Warning. Projection through a volume containing both
negative and positive numbers may not give the
results you are expecting?
- Since values are interpolated, projection through a
volume containing a single point may give an image
in which the max exceeds the original value.
This is not a bug.
- Use: 'MD' with option 'FBS ON' to get higher resolution projection using FBS interpolation.

**SUBROUTINES**- PJ3_N, PJ3_FBS

**CALLER**- VTIL2

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