./_Man_SunOS_4.1.3_html/html6/vwcvph.6.html

Manual page for VWCVPH(6)

vwcvph - view convex polyhedron

SYNOPSIS

/usr/demo/vwcvph filename

DESCRIPTION

vwcvph allows the user to view a convex polyhedron from various positions with hidden surfaces removed. The viewing position is selected using the mouse. Using the SunCore Graphics Package, a 3-D projection is drawn on the Sun Monochrome Bitmap Display. The mandatory file argument contains a polygonal object definition as described in the manual page for /usr/demo/rotcvph.

The program operates in two modes: DisplayObject mode and SelectView mode. The program starts in DisplayObject mode:

DisplayObject:: The object is displayed in 3-D perspective with hidden surfaces removed. Type q while in this mode to exit the program. Press RIGHT mouse button to switch to SelectView mode.
SelectView:: Schematic projections of the outline of the object are shown and the mouse is used to select a viewing position. Press LEFT mouse button to set x and MIDDLE mouse button to set y in the Front View. Use MIDDLE mouse button to set z in the Top View. Press RIGHT mouse button to switch to DisplayObject mode.

The view shown in DisplayObject mode is drawn using the conventions that the viewer is always looking from the viewing position toward the center of the object and that the positive y axis on the screen is the projection of the positive y axis in object coordinates.

The input file may define non-convex objects. The program will display these objects but hidden surface computations will not be done correctly.

FILES

/usr/demo/data/*.dat: sample object definition files

BUGS

Lines which are common to two visible polygons in a view are drawn twice, once for each polygon.