NX8 - create a body using Through Points or From Poles

[MATHI KRISHNAN]

 

 

To create a body using Through Points or From Poles, you must:

1. Choose a Patch Type.

2. For multiple patch, choose a Closed Along method for closing the sheet body.

3. For multiple patch, enter the degrees for rows and columns. You do not have to specify degrees for single patch.

4. Specify rows of points or poles to be used to create the body, using either the Point Specification Method dialog or by using specifying a file containing the point definitions.

Patch Type

 

Single creates a body consisting of only one patch.

Multiple creates a body consisting of a rectangular array of single patches.

Closing the Patch

 

Closed Along lets you choose a method for closing a multiple patch sheet body using the following options:

Neither	The sheet body begins and ends with the specified points.
Rows	The first column of points/poles becomes the last.
Columns	The first row of points/poles becomes the last.
Both	Closes the body in both directions (rows and columns).

If you choose to close the body in both directions or you close the body in one direction and the other direction the ends are planar, a solid body is created.

Degrees for Single Patch Bodies

 

For a single patch body, the system determines both the row and column degrees for you, depending on the points/poles and rows that you specify.

The Row Degree (U direction) comes from the row with the highest number of points.

The Column Degree (V direction) is equal to one less than the number of rows you specify.

Note	The minimum number of rows or points per row is two (minimum degree of one) and the maximum number of rows or points per row is 25 (maximum degree of 24 + 1).

The sheet shown in the figure below has 4 rows of points, so its column degree (V degree) is equal to 3 (=4-1). The largest number of points in any row is 6, so the rows degree (U degree) is equal to 5 (=6-1).

Degrees for Multiple Patch Bodies

 

For a multiple patch body, you must specify degrees for the rows and columns.

The Row Degree can be any number from 1 to 24. The default is 3.

The Column Degree can be set to any number from one to one less than the number of rows you specified. The default is 3.

Note	The minimum number of rows or points per row is two (minimum degree of one) and the maximum number of rows or points per row is 25 (maximum degree of 24).

For example in the figure below, the row degree can be set to any number from 1 to 4. The column degree is equal to 3.

Points/Poles

 

Once you have specified the degree and set the Patch Type and Closed Along parameter values, you must specify the points in one of the following ways:

• Choose OK, then specify the rows of points using the Ordered Point Constructor, or the rows of poles using the Point Constructor.

• Choose Points From File and specify the name of the file containing the point definitions. It must be a Rows of Points type file.

If you use the first method, when you have specified two or more rows of points (enough to satisfy the degree), you are prompted with two options:

All Points Specified	Creates the body and returns you to the dialog.
Specify Another Row	Lets you specify another row of points for the body you are creating.