Command: perspective

Syntax

persp { <window> }

Description

Display a perspective view of the model corresponding to the current perspective viewing parameters.

Parameters

• <window>
  A window identifier. The window must be a graphic window. If omitted, the current graphic window is used.

Switches

• -dbt=<num>
  A transition style to be invoked at the end of the contents repaint. This feature is used only when double buffering is active for the window and facilitates presentation-type effects. See here for a description of all available transition styles. If this switch is omitted, the transition style of the window is used (see window.double_buffering).

• -draw
  Draw the model. This is the default. Using -no_draw will suppress the draw.

• -el=<angle>
  The angle of elevation (negative angles look down on the model). <angle> should be in the range -89.5 to +89.5 degrees.

• -eye=<point>
  The eye position. This is computed relative to the current eye position.

• -fit
  Use the dimensions of the orthogonal box to fit the model into the window, using the current viewing view. This redefines the eye position.

• -foc=<point>
  The focus position. This is computed relative to the current focus position.

• -lens=<angle>
  The lens angle. <angle> should be in the range 4 to 120 degrees. For new views the default value is 60 degrees.

• -pl=<angle>
  The plan angle of view.

• -siz=<point>
  The screen size. This indicates the dimensions of the frame when plotted. For screen viewing, this parameter is not relevant.

• -yon=<num>
  The depth of view. This indicates the far cutoff distance measured from the eye. A value of 0 (the default) will set it to infinity.

• -z=<num>
  Zoom in or out of the model by a distance. A plus value zooms in, a negative value zooms out. This redefines the eye position.

• -zf=<num>
  Zoom in or out of the model by a percentage of the distance between the eye and focus. A plus value zooms in, a negative value zooms out. This redefines the eye position.

Notes

If the window is not currently in use, or is not a graphic window, no action is taken.

Using this command without parameters will just redraw the model using the current perspective parameters.

Examples

Draw a perspective view in the current graphic window.

persp -fit

Change the eye and focus positions.

persp win2, -eye=(-5000,-5000,5000), -foc=p0

Zoom in by 200 modeling units.

persp -z=200

See Also