Centroid Calculator

Summary

This feature provides a means of generating centroids (a single 3D representative point) from your
solids. Centroids are used primarily in generating haul profiles but are also used in some constraints
and dependencies.

Location

Accessed by right clicking a table in the Data section of Spry. The Centroid Calculator Menu only appears if you have at least one Point3D Field on your Table.

User Interface

A. Centroid Options
B. Solid Selection Options
C. Centroid Field Options

Centroid Options

Calculation Mode

Choose between two modes for calculating the Z value of your centroids. The faster method uses the
min/max Z values of the solid. The slower method uses the min/max Z values of your solid, at the XY
coordinates of the centroid.

Centre Centroid Location

If you are calculating Centre Centroids of your solids, this slider gives you control over where you
want the centroid to sit between your floor and ceiling centroids

Range

Choose a pre-made range, or write Inline to determine which nodes on the table are included when
the tool is run.

Clear Existing Centroids

Ticking this option will clear centroids in nodes within the range set in the previous step before writing
the new centroids. Note it will only clear centroids in fields that you are currently writing to.

Overwrite Existing Centroids

Ticking this option will overwrite existing centroids when the calculator is run.

Solids Selection Options

For each solid that needs a centroid, select the solid from the Solid Selection Options menu on the
left hand of the screen. Then select a field to store each centroid generated from the calculator. You
do not need to create multiple centroids per solid.

Once you have set the fields for the centroids of each solid, click Next.

The Two-Pass Centroid Process

The recommended workflow for generating centroids is to complete two passes. The first pass is as
detailed above. Once completed, open the Centroid Calculator again and uncheck the Clear Existing
Centroids and Overwrite Existing Centroids.

Next, map the centroids calculated from the Waste solid to the fields set up for the Coal centroids.
Then map the centroids calculated from the Coal solid to the fields set up for the Waste centroids.

This method is effective in cases where a coal solid is missing, but a suitable waste solid is available,
and vice versa.

It is not effective where both the waste and coal solid for a node are missing.

Processes

In your scenario, go to the Processes tab and in the column titled Centroid Field, select a centroid field
from your Source Table. This is the final step linking your centroids from your Table to those parts of
your scenario that requires them: Haulage, Proximity Constraints, and some Dependencies.

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