EVALUATE VIEW MAPPING MATRIX

PEVMM

CALL SEQUENCE

CALL PEVMM (VWWNLM, PJVPLM, ERRIND, VWMPMT)

INPUT PARAMETERS

REAL VWWNLM(4)

View window limits in VRC: UMIN, UMAX, VMIN, VMAX.

REAL PJVPLM(6)

Values (XMIN, XMAX, YMIN, YMAX) in NPC define the Viewport in the NPC space in which the window defined by VWWNLM will be projected.

OUTPUT PARAMETERS

INTEGER ERRIND

Error indicator

REAL VWMPMT(3,3)

Resulting matrix.

PHIGS STATE

EFFECT

Returns a homogeneous 3 x 3 matrix allowing a 2D view reference coordinate (VRC) space window to be projected into a 2D viewport in normalized projection coordinate (NPC) space.

The window defined in VRC is a rectangle parallel to the U and V axes with coordinate N = 0.

The viewport into which the window is projected is defined by PJVPLM in NPC. The viewport is a rectangle defined in NPC where Z = 0 and the sides are parallel to the X and Y axes.

ERRORS

2

Ignoring function, function requires state (PHOP, *,*,*)

151

Ignoring function, invalid window: XMIN>=XMAX, YMIN>=YMAX, ZMIN>ZMAX, UMIN>=UMAX or VMIN>=VMAX

152

Ignoring function, invalid viewport: XMIN>=XMAX, YMIN>=YMAX or ZMIN>ZMAX

155

Ignoring function, the projection viewport limits are not within NPC range

SEE ALSO

set view representation, evaluate view orientation matrix