1.1 Objectives.......................................................................................................................7
1.2 Prerequisites....................................................................................................................7
1.3 Course Structure.............................................................................................................7
1.4 Using this guide................................................................................................................8
1.4.1 Exercise format.............................................................................................................8
1.5 Process Overview............................................................................................................9
1.6 The Graphical User Interface..........................................................................................10
1.7 Tool Bars.......................................................................................................................10
1.7 Tool Bars........................................................................................................................11
2 The Basics....................................................................................................................13
2.1 Axes Conventions.....................................................................................................13
2.2 Units.........................................................................................................................14
2.2.1 Working units.........................................................................................................14
2.2.2 Input/Output units...................................................................................................14
2.3 Curve Identification...................................................................................................14
2.4 The GUI...................................................................................................................15
2.4.1 Basic viewing.......................................................................................................15
2.4.2 Additional viewing facilities.....................................................................................18
2.4.2.1 The View dialogue..............................................................................................18
2.4.3 Display lock..........................................................................................................20
2.5 Zoom, Window, etc.................................................................................................20
2.5.1 Window into an area.............................................................................................20
2.5.2 Zoom and Pan functions.........................................................................................21
2.6 The Curve bar..........................................................................................................21
2.7 Listing the contents of a design.................................................................................22
2.8 Opening another design...........................................................................................23
2.9 Ending a Lines session............................................................................................23
Exercise 1...................................................................................................................24
3 Creating a new project..............................................................................................27
3.1 Project Creation....................................................................................................27
3.1.1 File formats........................................................................................................27
3.1.1.1 Stem and Stern Profiles ..................................................................................27
3.1.1.2 FOS, FOB, Knuckles, Tangents and Plines ....................................................27
3.1.1.3 Sections.........................................................................................................27
3.2 Creating a new design...............................................................................................28
3.3 Creating curves.........................................................................................................29
3.3.1 Setting the X value format .....................................................................................29
3.3.2 Create curve dialogue............................................................................................29
3.3.2.1 Importing data from a file....................................................................................30
3.3.2.2 Entering data manually.......................................................................................30
3.3.2.3 Fitting a curve to the data...................................................................................31
3.4 Editing a curve..........................................................................................................31
3.4.1 Fitting...................................................................................................................31
3.4.2 Fairing..................................................................................................................33
3.4.2.1 Curvature display ..............................................................................................33
3.4.2.2 Auto Fairing.......................................................................................................34
3.4.3 Saving, quitting and undoing changes.....................................................................35
3.5 Saving the design....................................................................................................35
Exercise 2....................................................................................................................36
4 3D Control Curves....................................................................................................45
4.1 Creating 3D control curves......................................................................................45
4.1.1 Creating 3D curves in an orthogonal plane.............................................................45
4.1.2 Creating a complex 3D curve ...............................................................................45
4.1.2.1 Creating the Clines.............................................................................................46
4.1.2.2 Merging the Clines .............................................................................................46
4.1.3 Interrogating a curve..........................................................................................48
Exercise 3..................................................................................................................49
5 Controlling the Parallel Mid Body............................................................................53
5.1 Creating the PMB Boundary Curves.....................................................................53
5.2 Angle curves........................................................................................................54
5.2.1 Creating an angle curve by interpolation.............................................................56
5.2.2 Creating an angle curve from a data file................................................................56
5.2.3 Creating an angle curve manually..........................................................................56
Exercise 4.....................................................................................................................57
6 Fitting & fairing the initial sections...............................................................................59
6.1 Fitting the sections....................................................................................................59
6.1.1 Importing the data file ...........................................................................................59
6.1.2 Fitting the data......................................................................................................59
6.1.2.1 Fit ................................................................................................................60
6.1.2.2 Get................................................................................................................60
6.2 Fairing the sections...............................................................................................61
6.2.1 Point manipulation ............................................................................................61
6.2.2 Curve manipulation............................................................................................62
6.2.3 Comparing the fairness of multiple curves............................................................62
6.2.4 Automating the fairing........................................................................................63
Exercise 5..................................................................................................................64
7 Fairing the hullform..................................................................................................67
7.1 Overview of 3D curve fairing................................................................................67
7.1.1 Graphical summary of the 3D fairing process ....................................................69
7.2 Creating separate designs......................................................................................70
7.3 Creating the 3D curves.........................................................................................71
7.3.1 Placing the Clines...............................................................................................71
7.3.2 2D Construction dialogue ................................................................................72
7.3.2.1 Displaying a grid............................................................................................72
7.3.3 3D Construction dialogue ................................................................................73
7.3.3.1 Further processing for 3D fairing curves .......................................................74
7.3.3.2 Sorting 3D curves....................................................................................75
7.3.4 Comparing the sections....................................................................................75
Exercise 6..................................................................................................................77
Exercise 7................................................................................................................77
Exercise 7...............................................................................................................78
8 Fairing the hullform.................................................................................................81
8.1 Fairing the 3D curves...........................................................................................81
8.2 Automatic fairing of a 3D curve............................................................................82
8.3 Fairing a 3D curve by projection...........................................................................82
8.3.1 Selection of Projection Views ..........................................................................82
8.3.2 Fairing the Plines...............................................................................................84
8.3.3 Checking the effect of changes while fairing.......................................................85
Exercise 8.................................................................................................................86
8.4 Refitting and Interpolation of Additional Sections..................................................89
Exercise 9.............................................................................................................91
8.5 Interpolating Waterlines and Buttocks................................................................94
8.5.1 Correcting unfairness in the waterlines and buttocks........................................94
8.6 Cycle...............................................................................................................95
Exercise 10.............................................................................................................96
9 The End Surface..................................................................................................99
9.1 Defining the end surface.................................................................................102
9.1.1 The half siding/radius tab............................................................................102
9.1.1.1 Stemhs and Sternhs macros.................................................................103
9.1.2 End Surface tab.......................................................................................103
9.1.3 Update tab .............................................................................................104
9.1.4 End type tab............................................................................................104
Exercise 12........................................................................................................105
10 Surface patches.............................................................................................109
10.1 Patch generation rules and restrictions........................................................109
10.2 Patch arrangement considerations.............................................................111
10.3 Starting PACE........................................................................................115
10.4.1 Standard tool bar ................................................................................116
10.4.2 View tool bar........................................................................................116
10.4.3 Patching tool bar...................................................................................116
10.4.4 Curve tool bar ........................................................................................116
10.5 Displaying curves and view manipulation....................................................116
10.5.1 Interactive zooming, Panning and Rotating............................................117
10.5.2 Window box zoom and view reset........................................................117
10.5.3 Creating a new window........................................................................117
10.5.4 Picking Cursor Feedback......................................................................118
10.6 Creating and Editing Curves......................................................................118
10.6.1 Creating Curves by Interpolation...........................................................118
10.6.1.1 New Curve - Planar.........................................................................119
10.6.1.2 New Curve – Non-Planar (Points).....................................................119
10.6.1.3 New Curve – Non-Planar (Projected)................................................120
10.6.2 Graphical selection of data points............................................................120
10.6.3 Removing points from a curve................................................................122
10.6.4 Inserting data points..............................................................................123
10.7 Joining Designs........................................................................................123
Exercise 13......................................................................................................125
10.8 Automatic generation of the Patches.........................................................134
10.8.1 Tangency tab........................................................................................135
10.8.2 Smoothing tab.......................................................................................135
10.8.3 Data Points tab .....................................................................................136
10.8.4 General tab...........................................................................................136
10.9 Displaying the surface patches..................................................................137
10.9.1 Smooth shading.....................................................................................137
10.9.2 Isophotes .............................................................................................138
10.9.3 Isoparametric........................................................................................139
10.9.4 Tangency.............................................................................................139
10.9.5 Control points.....................................................................................140
10.10 Modifying surface patches...................................................................140
10.10.1 Changing the patch options...............................................................140
10.10.2 Changing patch tangency conditions................................................141
10.10.3 Modification of the patch control points .........................................141
10.11 Saving the surface...............................................................................142
10.11.1 Saving a new surface.......................................................................142
10.12.1 Checking the patch to curve accuracy..............................................143
10.12.2 Checking the patch continuity...........................................................143
10.12.3 Releasing the Surface.......................................................................144
Exercise 14...................................................................................................146
Appendix 1...................................................................................................151
Appendix 2...................................................................................................152
Appendix 3 - Automation..............................................................................154
Symbolic Substitution....................................................................................154
Parametric macros ......................................................................................154
A simple macro............................................................................................155
Macro interface commands...........................................................................156
Automating basic processes...........................................................................160
Macro Organisation.......................................................................................161
Appendix 3 - Exercise...................................................................................164
Appendix 4 – Complex hullforms..................................................................168
Twin skeg hullforms.....................................................................................168
Stern Profile..............................................................................................168
Flat of bottom..........................................................................................168
Knuckle and other 3D curves.....................................................................169
Double sections in way of skeg..................................................................170
Twin Hull Model....................................................................................173
Creating the main control curves............................................................174
Fitting the sections................................................................................180
Adding Angle curves to control the Sections...........................................182
Creating the Pline WL9...........................................................................184
Fitting waterlines......................................................................................184
1 Introduction
This guide is provided as an accompaniment to the Lines training course. The basic course lasts five days and is designed to provide the user with sufficient knowledge to be able to take a new project from initial generation through to transfer to Hull. This course assumes that the users have previous experience of fairing whether manual or computer based and that they have some basic experience of computers.
1 Introduction
This guide is provided as an accompaniment to the Lines training course. The basic course lasts five days and is designed to provide the user with sufficient knowledge to be able to take a new project from initial generation through to transfer to Hull. This course assumes that the users have previous experience of fairing whether manual or computer based and that they have some basic experience of computers.