Create Unfold Trend

On the Block Model tab, in the Block Model group: Click Create Unfold Trend to create a locally varying anisotropic model for use in resource estimation, which is based on a single surface.

To create a model which is optimised for Implicit Modelling, see: Create Structural Trend

Trend Surface Wireframe

Select the Type and Name of the wireframe that will be used to model the trend.

Range

The Range value equates to the real distance equivalent to 1 standard deviation of the gaussian (or Normal) distribution trend. The range value is in “grid units” (i.e. metres or feet) and is a real distance of influence of the surface.

In practice this means that most of the influence of the trend surface is applied within the range distance from the surface.

Strength

This parameter represents a stretching factor along the Z direction in the unfolded coordinate space, which corresponds to the normals of the trend surface in the folded space.

The default Strength value is 1, in which case the unfolded trend surface is uniform in all directions:

The ellipses on the trend surface are isotropic:

Set the Strength parameter to 3, and the process will unfold and stretch the model in a direction normal to the trend surface:

Here the ellipses on the trend surface are flattened:

Trend Parameters

Trend grid cell size

A cell size (in meters) is specified in order to generate a model that is small enough to assess the sensitivity but does not create such a large model that there is no solution. Typically, the grid size will be a 100th of the length along the trend axis.

Extents

East, North and Z fields

Specify the Minimum and Maximum extents of the surface in the East, North and Z directions.

Use the buttons on the local toolbar to Manage the rows in the list.

Click the Autofill Extents button to select the source of the extents you want to autofill.

Edit Extents

Click the Edit Extents button to collapse the form and visually adjust the extents, automatically aligning the extents to a restriction rectangle in Vizex. Interactively adjusting the extents rectangle in the Vizex display, or in the Vizex Property Window, will update the values in the form.

See: Edit Extents

Select Implicit | Structural Trend | Display Trend to load the model in Vizex.

Output