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In this video we will introduce the workflow used to build a basic structural trend and how this can be applied to our geological surface.


6 min

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Video Transcript

<v Instructor>Welcome to this quick tutorial</v>

on getting started with structural trends.

This follows on from further guides

and videos available on the Seequent website

and YouTube channel,

including our recent blog post released on June 3rd.

Structural trends are similar to global trends

and that they both allow for changes

in directional continuity over a surface.

Structural trends however,

go one step further by allowing the user more flexibility

on controlling the strength and direction of the trend

at different points in space.

It’s not often that mineralization or geological units

behave in a consistent plaintiff fashion.

In which case, applying a structural trends

can be a great tool in helping to reflect this complexity.

A structural trend can be built using any number of meshes,

representing different trend directions.

They can be planar or curved.

They can be imported into Leapfrog

or created using just about any combination of data types.

For example, polylines, points, GIS lines,

structural observations, et cetera.

Currently in my 3D scene is my original surface

without any preferred orientation defined.

And it’s looking pretty unrealistic

to what I know of the mineralization.

By defining the different trend directions

and ensuring that they are available in my meshes folder,

I can start by right clicking structural trends,

new structural trend.

Under the trend type dropdown lists,

there are three options available to us.

Strongest along inputs, blending and non decaying.

I’ll start with non decaying,

which assumes that the strengths of the trend

doesn’t decay away from the mesh.

Click Add to select the mesh or meshes required.

And for now I’ll leave the default strength as they are.

We can see a visual representation of these parameters

by viewing the structural trend object in the scene.

Applying the default strength five, for instance,

has created an oblate spheroid

that is five times wider than it is thick.

Of course, this can be adjusted as applicable.

Using a non decaying structural trend is useful in defining

a more or less constant trend that has influence

across your entire model.

Let’s go back to the structural trends objects,

double click, and this time around,

I’m going to select my trend type as strongest along inputs.

Strongest along inputs allows you to create multiple trends

that decreases in strength away from the mesh

to a certain range.

After the set range,

there will be no effect from the trend.

In this example, I will change the range to 100

and leave the default strength parameter as five.

Leapfrog all the process, and we can visualize the outcome.

Using a strongest along input trend is useful in defining

a strong, localized geological trend

that essentially fades away from that point in space.

Let’s go back once again,

by double clicking our structural trend object.

And this time selecting blending for my trend type.

Blending will allow you to build a trend

for multiple meshes.

Where you can specify a range and strength for each.

Where trends intersect,

Leapfrog will workout to combine trend.

So this is a useful structural type

where two or more trends merge,

and you want to see a smooth transition.

Once you are happy with your structural trend

and you want to apply it,

then we can do so either to intrusion context surfaces

in the geological model,

as well as great shells in a numerical model.

In this example,

I’m going to apply my blended trend

to my mineralize intrusion surface.

Double click your surface under surface chronology

to bring up the edit dialogue.

Go to the surface in tab and click Additional Options

to enable further options for editing the surface.

From Trend select Structural Trend.

And when you click Ok, Leapfrog Geo will warn us

that it cannot use a linear interpolant

with a structural trend.

By clicking Ok, we are taken to the interpolant tab

where we can select spheroidal instead.

By clicking Ok, Leapfrog will regenerate

and we can look at the outcome.

We can compare our regenerated surface

with what we had originally,

and it’s looking much better than where we started.

Thank you very much for watching this quick video.

If you have any questions on this tutorial,

then please feel free to reach out

to the Seequent Support Team

using email [email protected]