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Note: After the division, the old entity disappears and the new entities are created. Join
Menu: Geometry->Edit->Join
With this option you try to join connected entities.
Join lines:
To join the lines of a selection that are connected with 'similar tangent' (with an user tolerance).
Note: the lines are not joined if the connection point belongs to other lines, has some condition applied, or the lines have set an structured number of divisions.
Join surfaces:
- Rebuild by boundary:
A group or connected surfaces must be selected in order to try to create a single approximated surface.
- QuickJoin (default option)
- NoQuickJoin. More parameters are available.
- IsProjectable : Yes or Not
- WeightBoundary: Yes or Not
- NumApproxPoints
- Tolerance
- Join only coplanars:
A group of surfaces must be selected, and automatically are detected subgroups of planar parts that are joined in single planar surfaces.
- TolAngle could be set to determine when two surfaces are coplanar
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- Use points: When meshing this polyline, there will be at least one node at every point location that defines the polyline. These will be the endpoints of interior lines.
- Not use points: When meshing this polyline, the mesh generator ignores the points and therefore the nodes will be placed anywhere. This is the default option. Nodes will only be put in the position of a point if there is a 4-sided surface over a part of a polyline (see Automatic 4-sided surface creation).
- Only points: When meshing this polyline, the nodes will only be placed where the geometry points are.
Note: If one condition is assigned to one interior point of a polyline (see Conditions), one node of the mesh will be placed over that point.
Geometry Menu>Edit>SurfMesh
Menu: Geometry->Edit->SurfMesh
Select one or several surface meshes (see Surface mesh). The options are:
- Draw mesh: Surface will be drawn as a mesh.
- No draw mesh: Surface will be drawn as a regular surface with magenta lines close to the boundary lines.
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- Fix boundary Check the fix boundary option if you do not want to move the boundary control points of the line.
- Insert knot: You are asked for a knot value between 0.0 and 1.0 and this is then inserted. The program checks that the knot multiplicity is not greater than the order (order=degree+1). As the number of knots increases, the number of control points also increases, so this option can be used to have more points defining the same curve.
- Knot removal : the inverse of knot insertion. Remove knots if possible without change shape with a given tolerance. (interesting to save memory)
- Elevate degree: With this option the degree of the curve is raised by one. The new curve will have the same shape but with more control points and knots.
- Reduce degree : the inverse of degree elevation. Decrease the polynomial degree if possible without change shape with a given tolerance.
- Change weight: A new positive weight can be introduced for any control point, with the exception of the end points.
- Cancel weights: All weights of the NURBS are converted to 1.0 and the curve is no longer rational.
- Reparameterize: With the same control points a new curve is calculated to get a better curve with a more uniform parameterization.
- Similar cubic: This option converts the curve to a simplified one with degree=3, which is only an approximation of the original one.
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- Insert knot: You are asked for a knot value between 0.0 and 1.0 and it is then inserted. The program checks that the knot multiplicity is not greater than the order. This option can be used to have more points defining the same surface.
- knot removal: the inverse of knot insertion. Remove knots if possible without change shape with a given tolerance. (interesting to save memory)
- Elevate degree: With this option the degree of the surface is raised by one. The new surface will have the same shape but with more control points and knots.
- Reduce degree : the inverse of degree elevation. Decrease the polynomial degree if possible without change shape with a given tolerance.
- Change Weight: A new positive weight can be introduced for any control point, with the exception of the end points that must have weight=1 (to force the surface to pass over the corner control points).
- Cancel weights: This converts the weights of all the control points to 1.0
- Reparametrize: This reparameterizes the surface obtaining an optimized surface. When a Nurbs surface is not well parameterized, the mesh is of a lower quality.
- Similar cubic: This option converts the surface to a simplified one with degree=3 in both parametric directions, which is only an approximation of the original one.
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- With lines:
With this option you can select one existing NURBS or planar surface and a set of closed lines that are inside it and that form one or more holes. The lines may be created by an intersection with another surface. The holes will be added to the existing surface.
- With surfaces:
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- Lines: This option lets you select several lines for which GiD then tries to find as many intersection points as possible. Lines are divided where applicable.
The 'No Divide Lines' option creates an intersection point but does not modify the lines.
- Surface-2 points: You need to select one surface and two points that lie approximately over it. GiD calculates the line intersection between the surface and a plane defined by the two given points and the average normal to the surface of these points.
Note: Planar surfaces cannot be used with this option.
Note: See Point in line, Point in surface which can be used to define the points.
- Surface-lines: You need to select one NURBS surface and several lines. GiD then calculates the intersection between the surface and the lines. Lines will be divided at the intersection point.
The 'No Divide Lines' option creates the intersection point but does not modify the lines.
The Extend/Divide lines option extends the lines until they reach the surface.
- Surfaces: This command creates the intersection lines between several surfaces.
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- Union: Fuses two surfaces wherever they intersect to create a single, more complex surface.
- Intersection: Creates a surface based on the intersecting points of two separate surfaces.
- Subtraction: Negates a specific portion of a surface to create a hole or indentation.
- Subtraction and intersection: Creates the intersected and the substracted surface at the same time.
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- Union: Fuses several volumes wherever they intersect to create a single, more complex volume.
- Intersection: Creates a volume based on the intersecting points of several separate volumes.
- Subtraction: Negates a specific portion of a volume to create a hole or indentation.
- Subtraction and intersection: Creates the intersected and the substracted volume at the same time.
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