# Synopsis

PDX_MSGT gdx_GetExtSurfContinuity(long option, MDA_PTR db_ptr, double *cont_toler, int *u_continuity, int *v_continuity)

# Purpose

Get the GDX extruded surface continuity.

# Description

Determines the minimum continuity between all the segments in the GDX extruded surface entity to within the cont_toler tolerance. The u_continuity and v_continuity values can vary from -1 for discontinuous to a maximium directrix curve in U and 1 in V. The GDX extruded surface entity must be a valid GDX definition.

# Input

## option

Options &d GDX_GTEST Test for G continuity for derivatives to 2

## db_ptr

The GDX extruded surface entity database pointer.

## cont_toler

The continuity tolerance. The distance between the derivatives must be less then or equal this value to have derivative continuity .nf [0] = Model Space Distance (G0) [1] = Radian angular difference (G1) [2] = Curvature difference (G2) [3] = Normalized derivative difference .fi

# Output

## u_continuity

The U level of continuity (-1 to directrix curve degree).

## v_continuity

The V level of continuity (1)

# Tolerances

          NORMAL_MAG_TOL
          .fi

# Return

          GDX_NOERR
          Low level error return
          .fi