graPHIGS Programming Interface: Subroutine Reference

The graPHIGS Programming Interface : Subroutine Reference

GPVPLN - Set View Plane Normal

GPVPLN (normal)

Purpose

Use GPVPLN to set the View Plane Normal in the USL (Utility State List) to the value specified.

When the Compute View Matrix (GPCVMT) subroutine is called, this vector serves as the n-axis of the Viewing Coordinate (VC) system. For more information on the Viewing Coordinate system, see The graPHIGS Programming Interface: Understanding Concepts

Parameters

normal -- specified by user, 3 short floating-point numbers (WC)

Directional components of view plane normal in World Coordinates (WC)

Error Codes

56: SPECIFIED VECTOR HAS LENGTH ZERO

Related Subroutines

None

RCP code

201331202 (X'0C001202')