Click on the Smoothing tab to establish the options:
- Box: Choose this for a simple "moving box filter" in which the voxels are re-assigned new values based on a distance-weighted average of all the original nodes that reside within the box. This is the faster of the two options, but can possibly create more edge effects.
- Box Filter Dimensions (Voxels): These settings establish the horizontal and vertical filter size, which define how many adjacent nodes should be used when computing the average (smoothed) G-value for each model node.
- X-Offset (voxels): Click here to enter the "depth" of the horizontal filter. If you enter "1", then each node will be assigned the average of itself and the 8 nodes immediately surrounding it, 1 layer deep horizontally. If you enter "2", the node will be assigned the average of itself and the 24 nodes immediately surrounding it, 2 layers deep. When in doubt, enter "1".
-
- Y-Offset (voxels): Click here to enter the depth of the vertical filter. Entering "1" will set each node to the average of itself and the 9 nodes immediately above it and the 9 nodes immediately below. When in doubt, enter "1".
-
- Box Filter Dimensions (Voxels): These settings establish the horizontal and vertical filter size, which define how many adjacent nodes should be used when computing the average (smoothed) G-value for each model node.
- Cylinder: Choose this for a cylindrical filter, with dimensions defined in project units. This is the slower of the two options but can create smoother output.
- Filter Dimensions (Project Output Units)
- Automatic: Choose this for the filter dimensions to be set automatically by the program. It will set the radius of the search cylinder to 150% of the model X-spacing and 150% of the model Z-spacing.
- Manual: Choose this to set the radius and height manually.
- Radius: Enter the radius of the smoothing cylinder in your project units.
- Height: Enter the height of the smoothing cylinder in your project units.
- Filter Dimensions (Project Output Units)
- Surface Grid: Click here to browse for the name of the RockWorks grid model (.RwGrd file) that represents the ground surface. This is important to counteract a deep and highly contoured smoothing grid as you get near the surface of the model.
- Warping Grid: Click here to browse for the name of the grid model to serve as the warping grid.
Here are some examples of a lithology model, shown in cross section, created with no warping, with warping, with regular smoothing, and with warped smoothing. -
- Averaging: (Default) This method reassigns the node value based at the surrounding voxels (within the filter). This should not be used with lithology or stratigraphy solids.
- Classification: This method reassigns the node value based on the most frequently occuring value within the surrounding voxels. The classification filter is designed to be used when smoothing the contents of a lithology model or stratigraphy solid where you don't want the node values to be averaged but grouped.
- Tie-Breaking Methodology: Use this setting to define how RockWorks resolves instances in which a smoothing region contains an equal number of different voxels. For example, if the smoothing box encounters 1 clay voxel (G="0"), 18 gravel voxels (G="1"), and 18 sand voxels (G="2"), the tie-break option you choose will decide whether the smoothed voxel is assigned a value of "2" (Highest G) or "1" (Lowest G).
- Highest G: Choose this option if the classification filter should use the highest G value in the case of a tie.
- Lowest G: Choose this option if the classification filter should use the lowest G value in the case of a tie.
- Tie-Breaking Methodology: Use this setting to define how RockWorks resolves instances in which a smoothing region contains an equal number of different voxels. For example, if the smoothing box encounters 1 clay voxel (G="0"), 18 gravel voxels (G="1"), and 18 sand voxels (G="2"), the tie-break option you choose will decide whether the smoothed voxel is assigned a value of "2" (Highest G) or "1" (Lowest G).
- Do Not Smooth Selected G Values: Check this box if you want to enter a minimum and maximum G value range which are to be exempt from the smoothing process. This can be very helpful if you have "sacrosanct" voxels (e.g. faults and marker beds) that you do not wish to smooth.
- G-Min: Type in the minimum G value which will exempt a node from smoothing.
- G-Max: Type in the maximum G value which will exempt a node from smoothing.
In the example below, an unsmoothed lithology model is shown in 3D panels (left side). On the right, the lithology model was smoothed very slightly, using the classification method, to get rid of some of the small material crenulations. In addition, a Selective filter was applied for the pink intrusive material so that it would not be smoothed at all.
