Page 2: Curves

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• Figure 1 – Blank Curves

Purpose:

CAD curves are used in various interfaces of LS-PrePost for purposes such as mesh generation and mesh trimming. The curves interface provides a way of managing curve data with functions such as importing, saving, blanking from display, creation, modification, and deletion.

• Blank – Blank curves displayed on the screen. Curves can be selected by picking them individually or by selecting by area. (see Figure 1)

Blank all curves

Unblank all curves

Reverse operation

• Show Pts – Show connection points of curves (points can be used to define additional curves or to perform additional operations on curves)
• Label – Show curve labels

Pop up curves ID list

Project selected curves onto a clean 2D sketchboard

Exit curves data interface

• Figure 2 – Create Curves
• Create – Create a curve by picking points or nodes. Curves can be piecewise or smooth where a fitting function is used to create a smooth curve between all points chosen. (see Figure 2)
• Type: Select curve type (Piecewise curve, Smooth curve, Arc, Circle, Shell intersect)
• ID: Enter unique curve ID
• Name: Assign name to curve

• Arc Options:
• 3Ps – Pick 3 points
• C/2Ps – Pick center and 2 points in plane

• Circle Options:
• 3Ps – Pick 3 points
• C/2Ps – Pick center and 2 points in plane
• C/P/R – Define center, plane, and radius

• C: Enter center X/Y/Z
• PN: Enter plane normal vector
• Shell intersect Options:
• Use the General Selction interface (bottom panel) to select shell parts. Curves will be generated at their intersection.

Apply creation/deletion of curves to database

• Figure 3 – Modify Curves
• Modify – Edit existing curves data (see Figure 3)
• Operation: Select curve operation type
• (Break, Join, Rename, Delete Points, Insert Points, Translate, Rotate, Smooth, Respace)

• Break Curve Options:
• New Curve Name: Enter new curve name

• At point – break curve at existing point
• At pick – break curve at picked location
• Auto-break – automatically break curve at specified angle
• By curve – break curve with another curve
• By plane – break curve with a plane
• Join Curve Options:

Clear pick points from curve

• Join Multiple – join multiple curves automatically
• Max.Dist: enter distance between curves to be joined

Apply auto join

Update auto join tolerance based on selection

• Rename Curve Options:
• New Curve Name: Enter new curve name
• Insert Points Options:
• Pick line segment – Pick line segment on curve for new data to be inserted

• New point position: Enter new data point x,y,z (press Enter to accept)
• Translate Curve Options:

Call Direction Dialog

• X: Enter X component of direction vector
• Y: Enter Y component of direction vector
• Z: Enter Z component of direction vector

• Distance: Enter distance for translation

• Copy – Translate a copy of the curve

Apply negative translation to curve

Apply positive translation to curve

• Name: Enter name for new curve when Copy is activate
• Rotate Curve Options:

Call Direction Dialog

• X: Enter X component of rotation axis vector
• Y: Enter Y component of rotation axis vector
• Z: Enter Z component of rotation axis vector

• Angle: Enter angle for rotation

• Pick a Origin – Pick origin for rotation
• XYZ: Enter xyz for origin of rotation

• Copy – Rotate a copy of the curve

Apply negative rotation to curve

Apply positive rotation to curve

• Name: Enter name for new curve when Copy is activate
• Smooth Curve Options:
• Copy – Smooth a copy of the curve

Apply smoothing operation

• Respace Curve Options:
• Bias – Define biasing for respaced curve

• By Number – Respace by number of segments
• By Size – Respace by segment size

Accept curve modifications

Reject curve modifications

• Figure 4 – Delete Curves
• Delete – Delete Curves (see Figure 4)

Apply creation/deletion of curves to database

Reject deletion of curve(s)

• Figure 5 – RD/WT Curves
• RD/WT – Read/Write curves data in various formats (see Figure 5)
• Type: Select curve data type (IGES, VDA, XYZ, DXF, Define Trim 3D)

• Filename: Enter filename to read/write