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TIN Surface Direct Modeling

  • Updated

Command: TinExtract, TinMerge, TinModify

About: In BricsCAD, topographical surfaces created as a TIN Surface, can be adjusted using different tools.

Lesson objectives: After completing this lesson, you will be able to:

  • Creating meshes, solids, borders, faces and points from TIN Surfaces.
  • Merge TIN Surface
  • Deforming TIN Surfaces
  • Smoothen TIN Surfaces

About TIN Extract

The TINExtract command is used to generate a solid, mesh, border, faces and points from a TIN surface. You can exchange these entities in other applications, to further analyze the surfaces. The solids or meshes can be created in different ways: as a vertical offset of the TIN Surface, as a model between two TIN Surfaces or as a model between a fixed elevation plane and the TIN Surface.

For more information about this command, visit the Command Reference article TinExtract.

Procedure: Creating a solid from a TIN surface using option Elevation

  1. Select a TIN Surface and type TINExtract in the commandline.

    You are prompted: Extract [Mesh/Solid/Points/Faces/Contours/Border] <Mesh>:

  2. Choose the desired extraction. Type in S of Solid and press Enter.

    You are prompted: Enter vertical offset or select [between Surfaces/Elevation] <1>:

  3. Choose the elevation height and press Enter.
    You are prompted: 1 entities extracted.

Procedure: Creating Points from a TIN surface

  1. Select a TIN Surface and type TINExtract in the commandline.

    You are prompted: Extract [Mesh/Solid/Points/Faces/Contours/Border] <Mesh>:

  2. Choose the desired extraction. Type in P for Points and press Enter.
    You are prompted: 10000 entities extracted.

Procedure: Creating Faces from a TIN surface

  1. Select a TIN Surface and type TINExtract in the commandline.

    You are prompted: Extract [Mesh/Solid/Points/Faces/Contours/Border] <Mesh>:

  2. Choose the desired extraction. Type in F for Faces and press Enter.
    You are prompted: 19602 entities extracted.

Procedure: Creating a Contours from a TIN surface

  1. Select a TIN Surface and type TINExtract in the commandline.

    You are prompted: Extract [Mesh/Solid/Points/Faces/Contours/Border] <Mesh>:

  2. Choose the desired extraction. Type in C for Contours and press Enter.
    You are prompted: Enter contour elevation or [Minor/maJor/All] <0>:

  3. Type in A for All and press Enter.
    You are prompted: 107 entities extracted.

Procedure: Creating a Border from a TIN surface

  1. Select a TIN Surface and type TINExtract in the commandline.

    You are prompted: Extract [Mesh/Solid/Points/Faces/Contours/Border] <Mesh>:

  2. Choose the desired extraction. Type in B for Border and press Enter.
    You are prompted: 1 entities extracted.

About TIN Merge

Different TIN Surfaces can be merged into one by using the TINMerge command. A merge is executed between a base surface and one or more surfaces to merge with.

For more information about this command, visit the Command Reference article TinMerge.

Merging TIN Surfaces

  1. Type TINMerge in the command bar.

    You are prompted: Select base TIN surface

  2. Choose a base surface. In this example, we choose the green surface as the base surface.

    You are prompted: Select TIN surfaces to merge:

  3. Choose one or more TIN Surfaces to merge with the base surface. Press enter when done. In this example, we choose the red and the blue TIN Surface.

    You are prompted: Remove merged TIN surfaces [Yes/No] <No>:

  4. Choose to keep or delete the original surfaces.

    Note: Selecting a different baseline, results in a different merge. It is important to remember that the surface to merge replaces the part of the base surface that it covers.

    The first example shows the merge of the green surface as the base surface and the blue and red surface.
    The second surface shows the merge of the blue surface as the base surface and the green surface.
    The third surface shows the merge of the red surface as the base surface and the green surface.

About TIN Modify

A TIN Surface can be modified by deforming or smoothening the surface. By deforming the surface, the TIN Surface is adjusted following the contours of an area defined by the user. By smoothening the surface, a selected area is leveled which is done by interpolation of this predefined area.

For more information about this command, visit the Command Reference article TinModify.

Procedure: Adding deformations on a TIN Surface using Radius

  1. Select a TIN Surface and type TINModify in the command bar.

    You are prompted: Select modification method [Deform/Smoothen] <Deform>:

  2. Choose the desired modification. Type D to choose deformation.

    You are prompted: Enter radius or [specify Contour/select Entity/draw Polygon] <10>:

  3. Choose a deformation radius.

    You are prompted: Specify location to deform or enter radius:

  4. Click on the area to apply the deformation.

    You are prompted: Set elevation or select deformation method [Cosine/Sine] <Sine>:

  5. Choose the elevation height.

    You are prompted: Modify existing or [create New/Existing] <Existing>:

  6. Choose whether you want to add the adjustment as a new element or as a modification of the existing TIN Surface.

    Note: By adding the modification as a new element, the structure of the original TIN Surface isn't modified but added as a new TIN surface.

  7. Click on other areas to add new deformation or press Enter to end the command.

Procedure: Adding deformations on a TIN Surface using specify Contour

  1. Select a TIN Surface and type TINModify in the command bar.

    You are prompted: Select modification method [Deform/Smoothen] <Deform>:

  2. Choose the desired modification. Type D to choose deformation.

    You are prompted: Enter radius or [specify Contour/select Entity/draw Polygon] <10>:

  3. Type C and hit Enter to choose to specify Contour.

    You are prompted: Specify contour location:

  4. Pick a contour on the TIN Surface.

    You are prompted: Modify existing or [create New/Existing] <Existing>:

  5. Choose whether you want to add the adjustment as a new element or as a modification of the existing TIN Surface. Type N to create a new element for the adjustment.

  6. Click on other contours to add new deformation or press Enter to end the command.

  7. You have now created a new element on your TIN Surface. You can change its properties as you like. For example: change the color of the element.

Procedure: Adding deformations on a TIN Surface using select Entity

  1. Select a TIN Surface and type TINModify in the command bar.

    You are prompted: Select modification method [Deform/Smoothen] <Deform>:

  2. Choose the desired modification. Type D to choose deformation.

    You are prompted: Enter radius or [specify Contour/select Entity/draw Polygon] <10>:

  3. Type E and hit enter to choose Select Entity.

    You are prompted: Select closed entity:

  4. Select a closed entity (e.g. Polyline).

    You are prompted: Enter offset distance:

  5. Choose an offset distance.

    You are prompted: Specify location to deform:

  6. Click on the area to apply the deformation.

    You are prompted: Set elevation:

  7. Choose the elevation height.

    You are prompted: Modify existing or [create New/Existing] <Existing>:

  8. Choose whether you want to add the adjustment as a new element or as a modification of the existing TIN Surface. Type N to create a New element for your adjustment.

    You are prompted: Specify location to deform:

  9. Click on other areas to add new deformation or press Enter to end the command. You have now added a deformation using select entity.

Procedure: Adding deformations on a TIN Surface using draw Polygon

  1. Select a TIN Surface and type TINModify in the command bar.

    You are prompted: Select modification method [Deform/Smoothen] <Deform>:

  2. Choose the desired modification. Type D to choose deformation.

    You are prompted: Enter radius or [specify Contour/select Entity/draw Polygon] <10>:

  3. Type P and hit enter to choose to draw Polygon.

    You are prompted: Pick point [close] <close>:

  4. Draw a polygon, hit enter to close the polygon.
    You are prompted: Enter offset distance:

  5. Choose an offset distance.

    You are prompted: Specify location to deform:

  6. Click on the area to apply the deformation.

    You are prompted: Set elevation:

  7. Choose the elevation height.

    You are prompted: Modify existing or [create New/Existing] <Existing>:

  8. Choose whether you want to add the adjustment as a new element or as a modification of the existing TIN Surface. Type N to create a new element for your adjustment.

    You are prompted: Specify location to deform:

  9. Click on other areas to add new deformation or press Enter to end the command. You have now added a deformation using draw polygon.

Procedure: Smoothening a TIN Surface

  1. Select a TIN Surface and type TINModify in the command bar.

    You are prompted: Select modification method [Deform/Smoothen] <Deform>:

  2. Choose the desired modification. Press S to choose Smoothen.

    You are prompted: Enter radius or [select Entity/draw Polygon] <10>:

  3. Choose a radius.

    You are prompted: Specify location to deform or enter radius:

    Note: The procedure for select Entity or draw Polygon is analog to Adding deformations using select Entity and Adding deformations using draw Polygon starting from step 3.

  4. A preview of the intervention is shown.

  5. Click to execute the command.

  6. Click on other areas to smoothen or press Enter to end the command.

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