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Topologye : Choose the topology type of your selected mesh model. Currently, there are two types of topology for choice: 1. plane-homoeomorphous; 2 cylinder-homeomorphous. LSPP use the primitives of the topology type as a template for surface creation. When you choose cylinder-homeomorphous , Boundary curves for surface and Untrimmed boundary will be disable.
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Mesh : Use General Selection Interface to select a mesh.
This checkbox allows user to select the mesh model for surface creation.
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Boundary curves for surface :
in case that user has selected a mesh model and wants to create surface from any sub-mesh region, this checkbox lets user select a boundary loop to define the inner region as a sub-mesh .
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Gap Tol :
Tolerance threshold for the end point connection for selected boundary curves
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Set control point number :
This checkbox helps you specify surface UV control point number or not. By default, users do not need to care the surface uv control point number, program will compute a reasonable number for surface creation. However, for thoes advanced users who understand the feature of uv control point number very well, this checkbox is helpful for them to specify their desired number for better surface generation. When this checkbox is checked, the two textfield U Ctl Points and V Ctl Points will be enabled. The following picture shows U-direction and V-direction for a NURBS surface.

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U Ctl Points :
surface control point number in U-direction. This number will be used as an initial number to create the surface. When you create S urface by Mesh , the final surface control point number is often greater than this initial number; However, when you create S urface by Nodes , the final surface control point number in U-direction is same as your input number. The default number is 21 if it is activated. The maximum number is 300 .
- V Ctl Points :
surface control point number in V-direction. When you create S urface by Mesh , the final surface control point number is often greater than this initial number; However, when you create S urface by Nodes , the final surface control point number in V-direction is same as your input number. The default number is 21 if it is activated. The maximum number is 300 .
- U Degree :
surface degree number in U-direction. The default surface degree is 3. The maximum degree number is 8
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- V Degree :
surface degree number in V-direction. The default surface degree is 3. The maximum degree number is 8
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- Max Tol :
threshold for the maximum tolerance between the selected nodes/mesh and the final surface. The default number is 0.5. User can adjust this number for higher or lower precision
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- Ave Tol :
average tolerance between the selected nodes/mesh and surface reported by the program
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- Smoothness :
smoothness factor for surface generation. This factor helps user control surface smoothness, also this parameter effects surface precision. Little smoothness factor number results in little weight on surface smoothness and more weight on high presion; High smoothness factor effects oppositely. Usually, the default number is ok for general surface generation
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- Untrimmed boundary :
this checkbox only works for the case that the Boundary curves for surface is checked for sub-mesh surface creation. In this case, if this checkbox is checked, the program will detect automatically 4 sharp corners for a surface and the surface will be created as a untrimmed surface. Therefore, the boundary curves are kept as iso-line in U-direction and V-direction .
If this button is not checked, a trimmed surface will generate as shown as the following picture, and the boundary line may not be iso-line.
- Preview :
This button helps user preview surface. User can preview surface by the default parameters setting or preview a new surface by modification of the parameters such as Ref Plane Diretion £¨ dx, dy, dz £© (for Surface by Nodes ), surface uv control point number, surface degree number, maximum tolerance threshold or smoothness factor .
- Fit :
This button helps user get a high precision under the threshold of maximum tolerance. After user click Preview button, this button will be enabled in case that the initial surface was created successfully, and a message about the surface data will be printed in the message dialog. Usually, the maximum tolerance of this initial surface may not reach the specified threshold value. Then user can click this Fit button to get higher precision. Sometimes, user needs to click this button by several time for their desired precision .
Apply :
After user has gotten a satisfactory surface by clicking Preview button and Fit button continuously, clicking this button will let user accept the surface and add it into database. Atfer the surface was added into database, Undo button will show .
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Undo :
click this button to remove the accepted surface from database
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Close : Close this dialog.
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