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SUBROUTINE MATPX (T,CX,CY,CZ,CH) C$ (X-Axis Perspective Matrix) C$ Return in T(*,*) a four-dimensional perspective projection C$ matrix corresponding to the X = 0 view plane with the C$ center of projection at the point (CX,CY,CZ,CH). If the C$ center of projection is on the view plane, an error message C$ will be generated and a unit matrix returned. C$ (30-JAN-82)