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Create TIN by points

Create TIN by points

Creating surfaces

Creating TIN by points

MouseOK   Ribbon: TopoplanCreate TIN >  Create TIN by points

MouseOK   Menu: GroundCreating TIN >  Creating a TIN by points

MouseOK   Toolbar: Creating TIN >  Creating a TIN by points

KeyboardOK Command line: NG_CREATE_TIN

 

The command creates a TIN (Triangular Irregular Network) surface – an irregular triangulation network by Points, Geopoints, Blocks. The following objects can be created: SubMesh, Polyface mesh, Solids and Faces.

 

The command options are set on the Properties bar.

Options:

Result type values

PolyFace mesh – creates an object of Polyface mesh type, the nodes of which can be edited;

SubMesh – creates an object of SubMesh type without the ability to edit nodes;

Solids – will create a triangulation model consisting of separate triangle objects of Solid type;

Faces – will create a triangulation model consisting of separate triangle objects of 3D Face type.

Filtrate source points

You can change the number of points that will be used to build create triangulation. To do this, select Yes for the Filtrate source point option, select the type of filtration for Filter Units parameters and set the desired value in the Filter range field. This will create a mesh with fewer number of larger triangles. This accelerates the process of creating a triangulation model. The created model will be less accurate, but its further processing will take less time.

The following filtration types are possible:

·         Points number – the number of points to be used to create a triangulation model. The total number of points can be determined by selectin all objects of Point (or Geopoint, Block) type by which triangulation will be created.

·         Percent of points number – the percent of points that will be used to create a triangulation model. It is convenient to use when you know the minimum percentage of points that allows you to build a mesh of acceptable quality;

·         Maximum error – the maximum distance in drawing units from the surface formed by the bulk of points, beyond which points will be excluded from triangulation. It is convenient to use for creating a triangulation mesh over the earth's surface, automatically filtering out other objects: noises, trees, constructions, etc.

Build boundary from convex hull

When this option is enabled, after creating the triangulation the mesh will be processed. Triangles with an edge length greater than the specified one will be removed. The length value is specified in the Max edge field. The length is specified as a percentage of the maximum edge units of the face in a triangulation model or in drawing units (based on the value of Max edge units parameters).

Only external boundary

When this option is enabled, only triangles located at the mesh edges will be removed during the mesh processing.

Project points to UCS XY plane

When this option is enabled, the triangulation will be created in the XY plane of the user coordinate system. When the option is disabled, the triangulation will be created in the plane of the current view.

Select region

It is used when you need to build a model not by all points, but only by a certain part. In this case, click the button to the right of the Region is not selected value and draw a polygonal area within which the triangulation will be created on the point cloud.

Generate normals

Shading parameter. Calculates normals at the mesh vertices, resulting in a smoother mesh appearance in the Precise view. The option is available only if a mesh is selected as the resulting triangulation object.

Use point color

Colors the faces and vertices of the mesh according to the points color. The option is available only if a mesh is selected as the resulting triangulation object.

Break for optimization

If the triangulation model turns out to be very detailed (millions of faces), then for the possibility of further convenient work, it will be divided into several meshes. If the parameter is disabled, the model will not be split, a single mesh will be created.

Filter by layer

The possibility to create a surface only by objects of a certain layer. When you select Yes in the drop-down list, it is necessary to specify the layer.

Create layer

When you select Yes, the mesh will be created on a new layer TIN surface.

 

Command prompts:

Apply changes? <Yes> or [Yes/No]:

Yes – TIN will be created with the current settings.

No – if the settings have been changed, they are not saved. TIN will be created with the settings displayed immediately after starting the command.

 

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