Constructing a Surface

Construct Surface dialog box

There are two types of constructed surfaces (Independent Surface and Dependent Surface) available in PC-DMIS. The following table shows the two surfaces, along with their necessary inputs. The only input that the surface will take is a patch scan. The scan must contain at least two rows of four points per row.

A future release allows for pointclouds when constructing a surface.

CONSTRUCT FEATURE TYPE

SYMBOL IN EDIT WINDOW

#  OF INPUT SETS

INPUT #1:

COMMENTS

Dependent Surface

DEPENDENT

1

Patch scan containing at least 2 rows with 4 points per row

The surface will update as the input feature changes.

Independent Surface

INDEPENDENT

1

Patch scan containing at least 2 rows with 4 points per row.

This uses the input feature for construction only.

If you select inappropriate feature types, PC-DMIS displays "Cannot construct [feature]. Combination of input features not accepted." on the status bar.

To construct a Surface:

  1. Access the Construct Surface dialog box (Insert | Feature | Constructed | Surface).

  2. Input the desired patch scan.

  3. Select the various construction options.

  4. Click the Create button.

The Edit window command line for a sample Surface Construction would read:
feature_name=FEAT/SURFACE,TOG1,CONTROL POINTS U,
CONTROL POINTS V, NUM POINTS FIT,TOG2
THINNING PARAMETER U, THINNING PARAMETER V
CONSTR/SURFACE, INPUT TYPE, INPUT ID

The actual Edit report displays in all capital letters.

DEPENDENT is the default method of construction.

TOG1 = Dependent or Independent.

TOG2 = Tolerance or Proportion

The following paragraphs describe the available options for constructing a surface:

More:

Constructing a Dependent/Independent Surface

Thinning Parameters