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Seeding\Grouping Triangles

Seeding is the process of adding groups to a triangulation model i.e. Road, Buildings, Grass etc. This process allows for the creation of rendered images and videos once the triangulation has been associated with the relevant style and feature set.  By working on a copy of the Triangles the grouping will not be lost if plan prep regnerates them. 

The Define Triangulation Seeding panel is displayed, which contains a tool palette used for dynamic seeding. Click Show Details , a mapping table is displayed which allows you to set up triangle group codes between different feature types.  Most Feature seeding has been done by using the copied mxseeding file.  

The assignments are saved in a seeding file (mxdata\*.mxseeding) with a name derived from the model and triangulation you have been seeding. This file is automatically loaded if you reuse the option.

Feature Select

This tool assigns all triangles between the feature types which lie either side of the triangle you select to the current group code. It is particularly useful for seeding parallel features such as carriageway edges and shoulders. Note that all triangles lying between strings of the same feature type are seeded, no matter where they are in the model.

It is recommended that you use this tool first and then make any corrections using the other tools.

If you have assigned triangles using any of the other methods, they are not overwritten using Feature Select.

To define triangle groups using the mapping table 

The general procedure for defining a triangle group using the mapping table is as follows:

The triangles are automatically assigned to the group on the display. You can then adjust the group as required using the tool palette.

Use the Reset icon to clear all seeding to the defaults


Other tools

Use the Highlight, Crossing, Paint Brush and Fill to String Links tools to finish and correct the groupings.  Ensure you are in a TOP view rotation.

The general procedure for defining a triangle group using the simple method is as follows:

Eyedropper Tool

This tool changes the current group code to that of a triangle you select.

At any time when using a different tool, you can press the CTRL key and select a triangle to change the current group code.

Use Highlight to highlight the triangles before they are seeded.

Crossing Select

This tool draws a line across several triangles and assigns all triangles that the line crosses to the current group code.


This tool assigns individual triangles you click to the current group code. You can also drag the cursor to select multiple triangles.


This tool assigns triangles to the current group code using traditional seeding. It is less selective than the other tools, but is useful for seeding large areas at a time which you can then tidy up using the other tools. If the triangles have already been assigned, only triangles with the same group code as the triangle you select are seeded, so the tool is also useful for changing the group code of adjacent triangles.

Fill to String

This tool also assigns triangles to the current group code using traditional seeding, but stops at a string link. It is particularly useful for seeding closed shapes such as buildings.

Use the slider  underneath the palette to adjust the size of the link tolerance; a low value means that the seed can easily escape into the surrounding area whereas a high value means that the seed is easily blocked.  L strings are recognized as breaks.

Undo and Redo

Use these tools at any time to undo and redo the seeding. There is no limit to the number of undos you can perform and you can undo assignments made in a previous session. You can also use CTRL Z (Undo) and CTRL Y (Redo).

Use Back, Cancel, or Finish to conclude Grouping.

When Finished the Triangles will be displayed on your screen.





Grouped Triangles (1)_EPVT 

Existing Pavement

 streets.pal:pavement smooth light

Grouped Triangles (1)_GRAS

 Grass Areas

 landscape.pal:grass light green

Grouped Triangles (1)_RSTN

 River Stone

 streets.pal:gravel lt river rock

Grouped Triangles (1)_WODS


 landscape.pal:grass wild rough displaced

Grouped Triangles (1)_CONC


 streets.pal:Curbing rough

Grouped Triangles (1)_RIVR


 non-photo realistic.pal:Semi-Reflective Element Color

Grouped Triangles (1)_PPVT

 Prop. Pavement (dark)


Grouped Triangles (1)_ROOF

 Red Roof/Building

 floors.pal:Tile Flat Speckle

Grouped Triangles (1)_EGRV

 Existing Gravel Areas


Grouped Triangles (1)_WALL

 Stone for Walls

 brick.pal:Stone Wall (Flat)

Grouped Triangles (1)_WATR

 Water/Ponds and Lakes

 non-photo realistic.pal:Semi-Reflective Element Color

Trees for woods can be placed in microstation from cell file for3dlinestyles.cel using the key-ins - vba load cellsonsurface.mvba and  vba run ForestMixPlanter.main see Adding Trees for Woods for additional documentation.  Recommended settings (50 scale) include using cells Decid Tree, Decid Tree2, Decid Tree3, Coni Tree, Shrub and Bush2; Average Distance of 10-20', scales of 1 min, 4 max and check boxes for Rotate Cells and Place cells on Terrain.

Related Pages

Return to Drive Thru Visualization Summary

Roadway Designer

FlyThrough Producer

MX Wizard Index


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