Create and Display Isoshells from GEMS Block Models

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It’s Tip Tuesday! Today’s post comes from Hayley Manning, one of our Technical Customer Support Consultants.

GEOVIA GEMS™ users can interpolate your block-model data to create a boundary-like triangulation around blocks that have a specific value. In addition, GEMS can draw smoothed colour gradients to show the interior, in 3D or 2D slices through the isoshell. The isoshell’s colours reflect different ranges of numeric block-model data.

Multiple isoshells with transparent display created from the block model grade attributes.

To draw and display an isoshell, follow these steps:

1.  On the Block menu, point to Isoshell, and then click Create.

2.  Under Get data from, accept or modify the block-model attribute to use.

3.  Under Isoshell, enter a value at which to draw the isoshell triangulation. GEMS triangulates an isoshell around all block data that exceeds this value.

4.  Under Sections, set up how to draw any cross sections or long sections through the isoshell triangulation. Select a colour profile that has different colours for the range of values in the block model. To draw only a portion of the ranges in the colour profile (without modifying the colour profile), select ‘Cap all profile ranges at’, and then enter the value.

5.  Select a resolution at which to draw the colour gradients in isoshell slices. Higher settings may take longer to calculate and draw. 

6.  Select a plane that passes through the isoshell. In 3D View GEMS displays both faces of the slice (Figure 2). In 2D View GEMS will display the ‘toward’ face of the slice (not at the current plane itself) if that face is within the isoshell, or otherwise the away face, in 2D (Figure 3).

Two 3D views of the same a vertical section looking south, showing the colour gradient visible inside the isohels. 

2D view of isoshell looking south showing the ‘towards’ face of the active vertical section.

To save an isoshell as a solid, follow these steps:

1.  If you have no isoshell, draw the isoshell.

2.  On the Block menu, point to Isoshell, and then click Create Solid.

3.  Enter the solid properties and click OK to save.

  • After you save the solid, you can clear the isoshell. On the Block menu, point to Isoshell, and then click Clear.
  • GEMS automatically saves the current slice as an image (named Section2D) in the workspace.

Looking for more GEMS Tips & Tricks? Check out Hayley’s earlier post on Displaying Bock-Triangular Intersections with Greater Precision.  

Be sure to check back next week for more Product Tips & Tricks.

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