Establish the Minimum Iso-Level in RockPlot3D Isosurfaces

Follow these steps to filter out low G-values from display in the 3D isosurface.

In the Data pane of the RockPlot3D window, right-click on the name of the isosurface to be modified and choose Options. This is also available for morphed models.
Iso-level: Locate this section in the Isosurface Options window. You will see several settings.
- Iso Level Value slider bar: This will be labeled on the left with the minimum G value in the solid model, and on the right with the maximum G value in the model.
  By dragging the slider bar to the right, you will increase the minimum G value to be represented in the isosurface and you will see the screen display updated on the fly (you may need to move the Options window). The minimum G value represented at any time will be shown in the prompt box. If you prefer not to use the slider bar, you can type the desired minimum value directly into the prompt box.
  
  Compare the following two examples:
The image on the left represents a solid model that has been constrained within a single formation.
It is not necessary to click the Apply button to see changes in the isolevel – the display is updated continuously.
As you adjust the minimum iso-level, the computed volume will also be updated and displayed right above the slider bar.

You can click the Info button at the very bottom of the window to see the solid model’s G-value range and coordinate range.
Isosurfaces offer only a low-value filter; all-voxel models allow both a high- and low-value filter.