1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
-- File: BRepOffsetAPI_MakeFilling.cdl
-- Created: Wed Aug 26 09:31:31 1998
-- Author: Julia GERASIMOVA
-- <jgv@clubox.nnov.matra-dtv.fr>
---Copyright: Matra Datavision 1998
class MakeFilling from BRepOffsetAPI inherits MakeShape from BRepBuilderAPI
---Purpose: N-Side Filling
-- This algorithm avoids to build a face from:
-- * a set of edges defining the bounds of the face and some
-- constraints the surface of the face has to satisfy
-- * a set of edges and points defining some constraints
-- the support surface has to satisfy
-- * an initial surface to deform for satisfying the constraints
-- * a set of parameters to control the constraints.
--
-- The support surface of the face is computed by deformation
-- of the initial surface in order to satisfy the given constraints.
-- The set of bounding edges defines the wire of the face.
--
-- If no initial surface is given, the algorithm computes it
-- automatically.
-- If the set of edges is not connected (Free constraint)
-- missing edges are automatically computed.
--
-- Limitations:
-- * If some constraints are not compatible
-- The algorithm does not take them into account.
-- So the constraints will not be satisfyed in an area containing
-- the incompatibilitries.
-- * The constraints defining the bound of the face have to be
-- entered in order to have a continuous wire.
--
-- Other Applications:
-- * Deformation of a face to satisfy internal constraints
-- * Deformation of a face to improve Gi continuity with
-- connected faces
---Level: Advanced
uses
Shape from TopoDS,
Edge from TopoDS,
Face from TopoDS,
Pnt from gp,
Shape from GeomAbs,
Filling from BRepFill
raises
NotDone,
OutOfRange,
ConstructionError
is
Create( Degree : Integer from Standard = 3;
NbPtsOnCur : Integer from Standard = 15;
NbIter : Integer from Standard = 2;
Anisotropie : Boolean from Standard = Standard_False;
Tol2d : Real from Standard = 0.00001;
Tol3d : Real from Standard = 0.0001;
TolAng : Real from Standard = 0.01;
TolCurv : Real from Standard = 0.1;
MaxDeg : Integer from Standard = 8;
MaxSegments : Integer from Standard = 9 )
---Purpose: Constructs a wire filling object defined by
-- - the energy minimizing criterion Degree
-- - the number of points on the curve NbPntsOnCur
-- - the number of iterations NbIter
-- - the Boolean Anisotropie
-- - the 2D tolerance Tol2d
-- - the 3D tolerance Tol3d
-- - the angular tolerance TolAng
-- - the tolerance for curvature TolCur
-- - the highest polynomial degree MaxDeg
-- - the greatest number of segments MaxSeg.
-- If the Boolean Anistropie is true, the algorithm's
-- performance is better in cases where the ratio of the
-- length U and the length V indicate a great difference
-- between the two. In other words, when the surface is, for
-- example, extremely long.
returns MakeFilling from BRepOffsetAPI;
SetConstrParam( me : in out; Tol2d : Real from Standard = 0.00001;
Tol3d : Real from Standard = 0.0001;
TolAng : Real from Standard = 0.01;
TolCurv : Real from Standard = 0.1 );
---Purpose: Sets the values of Tolerances used to control the constraint.
-- Tol2d:
-- Tol3d: it is the maximum distance allowed between the support surface
-- and the constraints
-- TolAng: it is the maximum angle allowed between the normal of the surface
-- and the constraints
-- TolCurv: it is the maximum difference of curvature allowed between
-- the surface and the constraint
SetResolParam( me : in out; Degree : Integer from Standard = 3;
NbPtsOnCur : Integer from Standard = 15;
NbIter : Integer from Standard = 2;
Anisotropie : Boolean from Standard = Standard_False );
---Purpose: Sets the parameters used for resolution.
-- The default values of these parameters have been chosen for a good
-- ratio quality/performance.
-- Degree: it is the order of energy criterion to minimize for computing
-- the deformation of the surface.
-- The default value is 3
-- The recommanded value is i+2 where i is the maximum order of the
-- constraints.
-- NbPtsOnCur: it is the average number of points for discretisation
-- of the edges.
-- NbIter: it is the maximum number of iterations of the process.
-- For each iteration the number of discretisation points is
-- increased.
-- Anisotropie:
SetApproxParam( me : in out; MaxDeg : Integer from Standard = 8;
MaxSegments : Integer from Standard = 9 );
---Purpose: Sets the parameters used to approximate the filling
-- surface. These include:
-- - MaxDeg - the highest degree which the polynomial
-- defining the filling surface can have
-- - MaxSegments - the greatest number of segments
-- which the filling surface can have.
LoadInitSurface( me : in out; Surf : Face from TopoDS );
---Purpose: Loads the initial surface Surf to
-- begin the construction of the surface.
-- This optional function is useful if the surface resulting from
-- construction for the algorithm is likely to be complex.
-- The support surface of the face under construction is computed by a
-- deformation of Surf which satisfies the given constraints.
-- The set of bounding edges defines the wire of the face.
-- If no initial surface is given, the algorithm computes it
-- automatically. If the set of edges is not connected (Free constraint),
-- missing edges are automatically computed.
Add( me : in out; Constr : Edge from TopoDS;
Order : Shape from GeomAbs;
IsBound : Boolean from Standard = Standard_True )
returns Integer from Standard
---Purpose: Adds a new constraint which also defines an edge of the wire
-- of the face
-- Order: Order of the constraint:
-- GeomAbs_C0 : the surface has to pass by 3D representation
-- of the edge
-- GeomAbs_G1 : the surface has to pass by 3D representation
-- of the edge and to respect tangency with the first
-- face of the edge
-- GeomAbs_G2 : the surface has to pass by 3D representation
-- of the edge and to respect tangency and curvature
-- with the first face of the edge.
-- Raises ConstructionError if the edge has no representation on a face and Order is
-- GeomAbs_G1 or GeomAbs_G2.
raises ConstructionError from Standard;
Add( me : in out; Constr : Edge from TopoDS;
Support : Face from TopoDS;
Order : Shape from GeomAbs;
IsBound : Boolean from Standard = Standard_True )
returns Integer from Standard
---Purpose: Adds a new constraint which also defines an edge of the wire
-- of the face
-- Order: Order of the constraint:
-- GeomAbs_C0 : the surface has to pass by 3D representation
-- of the edge
-- GeomAbs_G1 : the surface has to pass by 3D representation
-- of the edge and to respect tangency with the
-- given face
-- GeomAbs_G2 : the surface has to pass by 3D representation
-- of the edge and to respect tangency and curvature
-- with the given face.
-- Raises ConstructionError if the edge has no 2d representation on the given face
raises ConstructionError from Standard;
Add( me : in out; Support : Face from TopoDS;
Order : Shape from GeomAbs )
returns Integer from Standard;
---Purpose: Adds a free constraint on a face. The corresponding edge has to
-- be automatically recomputed. It is always a bound.
Add( me : in out; Point : Pnt from gp )
returns Integer from Standard;
---Purpose: Adds a punctual constraint.
Add( me : in out; U, V : Real from Standard;
Support : Face from TopoDS;
Order : Shape from GeomAbs )
returns Integer from Standard;
---Purpose: Adds a punctual constraint.
Build( me : in out )
---Purpose: Builds the resulting faces
is redefined;
IsDone(me) returns Boolean from Standard
is redefined;
--- Purpose: Tests whether computation of the filling plate has been completed.
G0Error(me) returns Real from Standard;
--- Purpose: Returns the maximum distance between the result and
-- the constraints. This is set at construction time.
G1Error(me) returns Real from Standard;
---Purpose: Returns the maximum angle between the result and the
-- constraints. This is set at construction time.
G2Error(me) returns Real from Standard;
---Purpose: Returns the maximum angle between the result and the
-- constraints. This is set at construction time.
G0Error( me : in out; Index : Integer from Standard ) returns Real from Standard;
---Purpose: Returns the maximum distance attained between the
-- result and the constraint Index. This is set at construction time.
G1Error( me : in out; Index : Integer from Standard ) returns Real from Standard;
---Purpose: Returns the maximum angle between the result and the
-- constraints. This is set at construction time.
G2Error( me : in out; Index : Integer from Standard ) returns Real from Standard;
---Purpose: Returns the greatest difference in curvature found
-- between the result and the constraint Index.
fields
myFilling : Filling from BRepFill;
end MakeFilling;
|
