Applying a Polygon Filter to a Solid Model - RockPlot2D Polygons

RockWorks | Utilities | Solid | Filters | RockPlot2D Polygon Clip

This program reads (1) an existing RockPlot2D map (.Rw2D file) which contains one or more polygons and (2) an existing solid model (.RwMod file), and sets the model's nodes which lie either inside or outside a vertical projection of the polygon(s) to "0" or to null. This is a handy way to filter a solid model with multiple polygons.

Use: Filter a lithology model based on one or more property boundaries saved in a RockPlot2D map.

See also: Applying a Polygon Filter to a Solid Model for polygon-clipping using a single polygon stored in a Polygon Table in the database.

Menu Options
Step-by-Step Summary
 

Menu Options

• Input Model: Click to the right to browse for the name of the existing RockWorks solid model (.RwMod file) that the program is to read and filter. 
• Output Model: Click to the right to type in the name to assign to the new solid model that the program will create, which results from the polygon filtering operation. 
• Polygon File: Click to the right to browse for the name of the existing RockPlot2D map (.Rw2D file) which contains the polygon(s) to be used to clip the solid model.
  ! If the RockPlot2D map contains polygons which you don't want to use for clipping - such as closed contour lines or other shapes - you can disable those layers in RockPlot2D and they will be ignored here. 
  
  
• Operation: Expand this heading, if necessary, to select the operation:
  • Replace Nodes Inside Polygon: Choose this option to re-assign node values that lie inside a vertical projection of the polygon outline(s), using the replacement value defined below.  
  • Replace Nodes Outside Polygon: Choose this option to re-assign node values that lie outside a vertical projection of the polygon outline(s), using the replacement value defined below. 
• Replacement Value: Expand this heading if necessary to select the value to be assigned to the replaced nodes.
  • Null: Click in this radio button to assign a RockWare null value to the replaced nodes.  A "null" setting will set the nodes inside or outside of the polygon to a value that RockWorks interprets as "undefined" thereby rendering these regions invisible when displaying the models. Null values are also excluded from volumetric calculations.
  • Other (User-Specified): Click in this radio button to assign a specific numeric value to the replaced nodes.  Expand this heading to type in the specific value.
    
    
• Create 3-Dimensional Diagram: Insert a check here if you want to create a plottable 3D diagram of the resulting solid model. Click the Options button to access the diagram settings. 
  • Diagram Type: Choose Isosurface to display the solid model as if enclosed in a "skin". Choose All Voxels to display color-coded voxels. (More.)
  • Color Scheme: Click here to access a variety of pre-set color schemes, or to create your own.  (More.)
  • Isomesh: Insert a check here to plot a series of polylines that represent three-dimensional contours at a user-defined cutoff. Click on the Isomesh tab to establish the settings.  (More.)
  • Cage: Insert a check here to include vertical elevation axes and X and Y coordinate axes in the 3D diagram. Click on the Cage tab to set up the cage items.  (More.)
  • Legend: Insert a check here to include an index to the colors and G values in the diagram. Click on the Legend tab to access the settings.  (More.)
  
  

Step-by-Step Summary

1. Double-check that you have the following:  A real number RockWorks solid model, and a RockPlot2D map that contains one or more polygons to be used to filter the solid model. These will be the input files for this program.
2. Access the RockWorks Utilities program tab. It is not necessary to enter data into the main datasheet because RockWorks will be manipulating an existing solid model. 
3. Select the Solid | Filters | RockPlot2D Polygon Clip menu option. 
4. Enter the requested menu settings, described above.
5. Click the Process button to proceed.
   
   The program will load the input solid model, determine whether each node lies inside or outside of the polygon(s) stored in the RockPlot2D map, and set the node to the replacement value you requested. Nodes that are not reset are left unchanged. The resulting node values will be stored in a new solid model on disk under the output file name you selected. If you have requested a diagram, it will be displayed in a RockPlot3D tab. 
    
6. You can adjust any of the input options along the left side of the window and click the Process button again to regenerate the model and display.

   ! Each time you click the Process button, the existing 3D display will be replaced.

7. View / save / manipulate / print the image in the RockPlot3D window.

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