Skip to main content

Tips for intrusion modelling, and advanced surface editing in Leapfrog Geo.

During this technical workshop, we discuss advanced surface editing tips. Learn how to create accurate domains by developing a deeper understanding of intrusion parameters and the ways surfaces can be edited.



 

Overview

Speakers

Ivan Naumenko
Project Geologist – Seequent

Duration

19 min

See more on demand videos

Videos

Learn more about Leapfrog Geo

Learn more

Video Transcript

[00:00:00.595]
(upbeat music)

[00:00:04.520]
<v Ivan>Welcome to the technical</v>

[00:00:05.590]
Tuesdays webinars series.

[00:00:07.060]
My name is Ivan Naumenko

[00:00:08.350]
and I’m a Project Geologist with Seequent Australia.

[00:00:11.050]
Today’s webinar topic is advanced surface editing,

[00:00:13.940]
and we will focus on the intrusion surface type.

[00:00:19.690]
The Seequent solution encompasses

[00:00:20.870]
a range of software products applicable for use

[00:00:23.040]
across the money and value chain.

[00:00:24.980]
Today I’ll focus on Leapfrog Geo.

[00:00:27.100]
If you would like to find out more about other solutions,

[00:00:29.460]
please contact our support and sales stuff.

[00:00:33.710]
Today, I’ll focus on advanced surface editing techniques,

[00:00:36.450]
tips and tricks when using intrusion surface type.

[00:00:39.200]
We will we dig deeper into the settings menu

[00:00:41.210]
and we’ll review surface settings,

[00:00:43.580]
which you can adjust to achieve better results

[00:00:46.370]
when trying to make an intrusion surface to fit your data.

[00:00:50.090]
Also, we will discuss a couple of scenarios

[00:00:52.030]
that people are commonly facing

[00:00:53.300]
when modeling in Leapfrog Geo.

[00:00:56.408]
I will briefly go over the concept of intrusion surface type

[00:00:59.020]
and its main applications.

[00:01:01.280]
I will review the structure of intrusion surface,

[00:01:03.400]
In other words, how it’s generated and what it is based on.

[00:01:07.170]
We will look at trends editing the intrusion surface

[00:01:09.820]
by applying trends, linear or structural.

[00:01:12.470]
We will look at the intrusion values composite

[00:01:14.390]
in generation settings for intrusion surfaces

[00:01:16.690]
and see how these settings

[00:01:17.690]
can affect the result in surface.

[00:01:20.690]
Advanced surface settings, additional settings

[00:01:23.357]
that are available for intrusion surfaces and what they do.

[00:01:26.690]
Also we’ll have a brief look at the guide points.

[00:01:30.170]
What are those and how you can use guide points

[00:01:32.250]
to adjust your intrusion surface?

[00:01:35.210]
Before I jumped to the live demo

[00:01:36.430]
for the benefit of those who are new to LeapFrog Geo,

[00:01:38.680]
I would like to explain what the intrusion surface is.

[00:01:41.450]
Intrusion contact surfaces are rounder in shape

[00:01:43.560]
with an interior lithology that represents

[00:01:45.530]
the intrusion of lithology.

[00:01:47.200]
The intrusion removes existing lithologies and replaces them

[00:01:49.980]
with the intrusive lithology

[00:01:51.340]
on the youngest side of the contact surface.

[00:01:53.890]
Often the older side of the intrusion contact surface

[00:01:56.610]
is labeled as unknown, as typically intrusions displaced

[00:02:00.120]
multiple older lithologies.

[00:02:01.970]
Intrusion surfaces can be made from a range

[00:02:04.020]
of juicing different data types,

[00:02:05.530]
such as drilling polar lines,

[00:02:08.100]
GIS structural disks and points.

[00:02:11.740]
Now I’m going to switch to Leapfrog Geo

[00:02:13.460]
and continue with a live demo.

[00:02:17.150]
During this session,

[00:02:17.983]
we will focus on using the intrusion surfaces

[00:02:19.950]
in the construction of Geological Models.

[00:02:22.180]
Please keep in mind that intrusion surfaces

[00:02:23.970]
can be used to model porphyries, pegmatites or shells,

[00:02:27.100]
contamination in internal waste pockets,

[00:02:29.230]
as well as any other type of contact,

[00:02:31.070]
which generally requires a specific category of intervals

[00:02:34.650]
to be in close by contact and surface.

[00:02:37.550]
I have saved a couple of things to speed up the process

[00:02:39.660]
of switching between the views during this demo.

[00:02:42.040]
So let me quickly switch to the next scene.

[00:02:45.240]
First, let me start with an overview of the project.

[00:02:47.920]
This is a train in porphyry copper gold project

[00:02:49.950]
which has a number of drill holes intersecting

[00:02:51.680]
the various lithological units and a topographical surface

[00:02:54.490]
with some jazz data draped on it.

[00:02:57.270]
The units include a quartz vein, dollar ride dikes,

[00:03:00.310]
overburden unit, volcanic sediments,

[00:03:02.400]
granite diorite and quartz porphyry units.

[00:03:04.900]
The main focus of today’s session will be

[00:03:06.610]
on the last two units,

[00:03:07.720]
the granite diorite and the quartz porphyry.

[00:03:10.300]
For the benefit of those who are new

[00:03:11.570]
to Leapfrog Geo software,

[00:03:12.760]
I’ll briefly go through the process

[00:03:14.160]
of creating an intrusion surface.

[00:03:16.440]
I have already created a geological model

[00:03:18.120]
in which I am going to generate an intrusion surface.

[00:03:21.210]
Right click on the surface chronology object

[00:03:23.000]
in geological model.

[00:03:24.610]
Select the intrusion option

[00:03:25.810]
from the list of available objects.

[00:03:28.190]
If you would like to use your drill hole data

[00:03:29.850]
to create an intrusion surface,

[00:03:31.310]
then select new intrusion from basic lithology.

[00:03:35.090]
The first thing we need to do here,

[00:03:36.470]
is select the primary lith unit.

[00:03:38.240]
I will be building quartz porphyry intrusion,

[00:03:40.080]
so I will select quartz porphyry as a primary unit.

[00:03:44.180]
The next step is selecting the exterior and ignored units.

[00:03:47.690]
The contact in older lithologies

[00:03:49.830]
will stay under the exterior lithologies

[00:03:51.570]
and all younger ones will go into the ignored column.

[00:03:55.040]
As you can see, I have generated an intrusion surface

[00:03:57.480]
around quartz porphyry drill hole into walls.

[00:04:00.200]
If I have a closer look,

[00:04:01.460]
I can see that quartz porphyry contacts with the vein

[00:04:03.950]
and dike intervals have been ignored.

[00:04:06.850]
This is because I have set those lith units as younger.

[00:04:10.890]
Let’s have a closer look at the geological model

[00:04:12.850]
I have generated earlier.

[00:04:14.370]
As you can see, we have a sequence

[00:04:16.030]
of volcanic sediments model as a country rock unit.

[00:04:19.020]
We also have two intrusions,

[00:04:20.750]
the granite diorite and the porphyry,

[00:04:23.130]
all of these are caught by younger veins and dikes,

[00:04:25.400]
then clicked by the overburden unit at the top.

[00:04:28.550]
This surfaces have not been modified in any way

[00:04:30.710]
and are based purely on the drill hole data.

[00:04:33.880]
You might have already noticed a couple of issues

[00:04:35.680]
with the surfaces that need to be addressed.

[00:04:38.920]
Upon closer inspection we can see that,

[00:04:40.640]
there are problems with quartz porphyry intrusion surface.

[00:04:43.070]
Right in the center, there is a big gap split

[00:04:44.850]
in the quartz porphyry surface into parts,

[00:04:47.270]
as well as the small part of the surface disconnected

[00:04:49.810]
from the main body in depth.

[00:04:52.860]
These problems are likely to be caused by past drilling data

[00:04:55.900]
prompted to close off the intrusion surface rather

[00:04:58.340]
than generating a container surface.

[00:05:01.050]
Take into account a quite simple shape

[00:05:02.830]
of this porphyry intrusion.

[00:05:03.880]
my suggestion would be to avoid manual explicit edits

[00:05:06.660]
until we have tested different intrusion settings

[00:05:08.920]
to make the surface fit the data.

[00:05:11.830]
You will notice how the intrusion appears rounder,

[00:05:14.080]
as algorithm searches equally in all directions

[00:05:16.390]
to find correspondent intercepts.

[00:05:18.550]
My first thought would be to try using a linear trend

[00:05:21.090]
and see if applying direction of greatest continuity

[00:05:23.720]
will help to fix this problem.

[00:05:26.220]
To set the trend,

[00:05:27.053]
I’ll be using the tool called moving plane.

[00:05:29.080]
I will position the model in the scene so I can draw a plane

[00:05:32.030]
along this strike of the porphyry.

[00:05:34.000]
Please note that the moving plane doesn’t have to go

[00:05:36.040]
precisely through the center of the porphyry intrusion.

[00:05:38.690]
I will only use the plane to copy deep inasm values

[00:05:41.610]
to the intrusion surface.

[00:05:43.660]
Now I’m ready to apply the trend value

[00:05:45.720]
to my quartz porphyry intrusion surface.

[00:05:48.170]
Double click on the quartz porphyry intrusion,

[00:05:49.790]
and navigate to the trend tab in dialog window.

[00:05:53.510]
You can see that there is a set from plane button,

[00:05:55.550]
which allows you to copy the deep

[00:05:56.940]
as in with impeach information from the moving plane

[00:05:59.210]
to the intrusion surface.

[00:06:01.430]
The set to button allows you to copy the trend values

[00:06:04.130]
from other objects in your project,

[00:06:06.860]
or reset the trend back to isotropic.

[00:06:09.580]
You can control the strength of the trend

[00:06:11.180]
by adjusting the ellipsoid ratio values.

[00:06:14.700]
The ellipsoid ratio is determined that relative shape

[00:06:17.050]
and strength of the ellipsoids in the scene.

[00:06:21.220]
The maximum value is the relative strength in the direction

[00:06:23.930]
of the green line on the moving plane.

[00:06:25.960]
You can adjust it by left-clicking,

[00:06:27.650]
and activating controls on the moving plane.

[00:06:30.240]
The intermediate value is the relative strength

[00:06:32.300]
in the direction perpendicular to the green line

[00:06:34.300]
on the moving plane.

[00:06:35.970]
The minimum value is a relative strength

[00:06:37.960]
in the direction orthogonal to the plane.

[00:06:40.610]
As drilling is most often perpendicular to the orbital,

[00:06:43.380]
in the majority of cases, your minimum values,

[00:06:45.360]
should be your lowest number.

[00:06:48.040]
With the ellipsoid ratios, what is important,

[00:06:50.010]
is the ratio of the numbers you enter.

[00:06:51.900]
The higher the maximum and the intermediate numbers,

[00:06:54.040]
the stronger the trend is applied in that direction.

[00:06:57.240]
Things to consider when applying trends

[00:06:58.920]
are the geometry of the orbital,

[00:07:00.430]
as well as your drill holes pacing.

[00:07:02.840]
The thinner the intercepts

[00:07:03.950]
or the wider the drill holes are apart,

[00:07:05.810]
the stronger trend you may need to apply.

[00:07:08.100]
When applying a trend,

[00:07:09.180]
you may need to try a few different combinations of numbers

[00:07:11.860]
to create the optimal shape for your deposit.

[00:07:16.120]
I will click Concept From Plane and Okay

[00:07:18.220]
to apply the changes.

[00:07:21.350]
As you can see, the shape of the intrusion surface

[00:07:23.190]
has changed significantly,

[00:07:24.570]
and now it fits the data quite well.

[00:07:27.630]
Linear trends work very well on relatively simple deposits,

[00:07:30.520]
but quite often the structure and shape of the deposit

[00:07:32.990]
are much more complex and follow non-linear trends.

[00:07:36.690]
Leapfrog Geo has a tool called structural trend.

[00:07:39.100]
It allows you to apply a nonlinear trend

[00:07:41.240]
to an intrusion surface.

[00:07:43.080]
Structural trends create a flat ellipsoid anisotropy

[00:07:45.690]
that varies in direction with its inputs.

[00:07:48.600]
To create a new structural trend,

[00:07:50.010]
right click on the Structural Trends folder,

[00:07:51.990]
in the structural modelling folder

[00:07:53.930]
and select New Structural Trend.

[00:07:56.910]
The structural trend window will appear.

[00:08:00.110]
Structural trends can be created from surfaces

[00:08:02.210]
and from structural data.

[00:08:04.460]
Click add to select from the suitable inputs

[00:08:06.420]
available in the project.

[00:08:07.920]
I have generated a mash by creating a series of polar lines

[00:08:10.860]
representing the trend orientation and given locations.

[00:08:13.990]
And now I will use this mesh

[00:08:15.550]
as an input for my structural trend.

[00:08:18.630]
I won’t spend too much time explaining all settings

[00:08:20.890]
available for structural trends.

[00:08:22.810]
You can find more information about structural trends

[00:08:24.930]
in the help files or by contacting Leapfrog support team

[00:08:27.510]
in your region.

[00:08:29.890]
Now that I have my structural trend object ready,

[00:08:32.150]
I have to change some settings

[00:08:33.270]
in my quartz porphyry intrusion before I can apply

[00:08:35.755]
this structural trend to it.

[00:08:37.849]
I will double-click on the quartz porphyry intrusion object

[00:08:39.880]
to open the settings window,

[00:08:41.590]
then navigate to the surface in tab

[00:08:43.385]
and click on the additional options.

[00:08:44.790]
Then navigate to the interpolate tab,

[00:08:47.418]
I have to switch to the interpolate tab

[00:08:48.620]
from linear to spheroidal

[00:08:49.660]
before I can apply my structural trend.

[00:08:51.840]
You can read more about the interpolate settings

[00:08:53.850]
for intrusion surfaces in help files.

[00:08:57.120]
Now I can move back to the trend tab

[00:08:58.800]
and select the structural trend

[00:08:59.940]
that I would like to apply to this intrusion.

[00:09:02.710]
The outside value is a long range main value of the data,

[00:09:06.170]
such a new value of negative one for intrusions,

[00:09:08.500]
where the positive valleys are on the inside

[00:09:11.500]
and positive one for other surfaces

[00:09:13.860]
will result in a smoother surface in most cases.

[00:09:17.110]
Now we can see how the quartz porphyry intrusion

[00:09:19.250]
is following the structural trend.

[00:09:21.180]
We can compare it to the core support for intrusion surface,

[00:09:23.950]
with a linear trend applied to it.

[00:09:45.250]
Let’s dig a little bit deeper

[00:09:46.500]
and see how Leapfrog generates intrusion surfaces.

[00:09:49.580]
Leapfrog starts by extracting the intrusion intervals

[00:09:51.610]
from the drill hole database

[00:09:52.840]
and converting them into intrusion points.

[00:09:55.620]
Leapfrog converts the categoric interval data

[00:09:57.750]
into numeric point data.

[00:10:00.430]
We’ll now look closer at the point generation parameters.

[00:10:03.463]
I will double-click on the intrusion points,

[00:10:06.410]
the edit intrusion window will appear

[00:10:08.520]
displaying the point generation tap.

[00:10:10.530]
Here the surface and volume points are displayed

[00:10:12.550]
to show the effects of the surface offset distance

[00:10:15.180]
and background field space and parameters.

[00:10:18.040]
The surface offset distance parameters,

[00:10:19.690]
sets the top and bottom ends of the interval

[00:10:22.160]
and affects how surface behaves

[00:10:23.860]
when it approaches a contact point.

[00:10:26.110]
The smaller distance restricts the angles that an approach

[00:10:28.910]
and surface can take.

[00:10:30.690]
Another factor that affects the angles a surface will take,

[00:10:33.310]
is whether or not trend has been applied to the surface.

[00:10:37.480]
The background field space in parameter,

[00:10:38.970]
determines the approximate length of the segments

[00:10:41.230]
in the remaining intervals.

[00:10:43.660]
If the remaining interval is not a multiple

[00:10:45.350]
of the background field space and value,

[00:10:47.210]
Leapfrog will automatically adjust the spacing

[00:10:49.700]
to an appropriate value.

[00:10:51.800]
A smaller value for background field space

[00:10:53.910]
means high resolution

[00:10:55.240]
and therefore slightly smoother surfaces.

[00:10:57.440]
However, the computation can take longer.

[00:11:01.200]
Now let’s have a look at the intrusion points

[00:11:02.790]
composite in settings.

[00:11:04.170]
This can be accessed by double clicking

[00:11:05.760]
on the intrusion points and navigating to the composite tab

[00:11:08.670]
in the dialogue window.

[00:11:11.140]
Sometimes unit boundaries are poorly defined with fragments

[00:11:13.800]
of other lithologist within the lithology of the interest.

[00:11:17.160]
This can result in very small segments

[00:11:18.750]
near the edges of the lithology of interest.

[00:11:21.200]
Modelling defined detail is not always necessary,

[00:11:23.870]
And so compositing can be used to smooth these boundaries.

[00:11:28.150]
As you can see it Leapfrog applies automatic composition

[00:11:30.350]
into the input data.

[00:11:31.910]
This setting can be manually adjusted.

[00:11:34.040]
The automatic setting values depends

[00:11:35.820]
on the resolution settings applied to the surface

[00:11:38.813]
and set to half of the resolution value.

[00:11:41.030]
In this example the surface resolution is set to 30,

[00:11:44.170]
therefore the automatic compositing values are set to 15.

[00:11:49.040]
Might have already noticed that a short segment

[00:11:50.810]
in the center of the screen has been filtered out,

[00:11:53.010]
due to the compositing settings.

[00:11:55.330]
There are a couple of ways in which you can bring it back.

[00:11:59.520]
First, adjust the surface resolution value

[00:12:01.550]
to allow for shorter segments to be included.

[00:12:03.900]
Second, untick the simplify geology

[00:12:06.140]
by filtering short segments box.

[00:12:08.350]
And the third way is to adjust the filtering values,

[00:12:10.540]
so the short intervals of specific length

[00:12:12.800]
are included in the modeling.

[00:12:15.160]
Now I’ll try to untick the box,

[00:12:16.650]
simplify geology by filtering short segments,

[00:12:19.030]
then click Okay.

[00:12:21.020]
As you can see,

[00:12:21.853]
the short segments has now been included

[00:12:23.380]
in the construction of the intrusion surface.

[00:12:26.830]
There will be situations when dealing with photo models,

[00:12:29.290]
in which you might have limited data

[00:12:30.940]
in one or more of your fault blocks.

[00:12:34.090]
In such cases,

[00:12:34.923]
you may want to switch off the boundary filter

[00:12:36.950]
to allow Leapfrog, to use data outside of the domain

[00:12:39.400]
to inform the surface.

[00:12:41.970]
You can turn the screen

[00:12:42.830]
that the quartz porphyry intrusion surface

[00:12:44.740]
in one of the fault blocks

[00:12:45.980]
is based only on a single interval

[00:12:48.570]
and very much unconstrained at depth.

[00:12:51.260]
To rectify this issue, I will try

[00:12:52.960]
and adjust the boundary filter settings.

[00:12:56.530]
You can access the boundary filter settings,

[00:12:58.260]
by double clicking on the surface

[00:12:59.750]
and navigating to the surface and tap.

[00:13:02.150]
From the dropdown menu, under the boundary filter field,

[00:13:05.020]
select one of the settings you would like

[00:13:06.510]
to apply to this particular surface.

[00:13:08.940]
The boundary often intrusion

[00:13:10.170]
can be the geologic model boundary or fault block boundary.

[00:13:14.250]
The boundary filter setting determines how data used

[00:13:16.720]
to define the surface is filtered.

[00:13:18.850]
When it’s switched off, data is not filtered.

[00:13:21.970]
When it’s set to all data, all data is filtered.

[00:13:25.560]
When it’s set to drilling only, only drill hole data

[00:13:27.900]
and data objects derived from drill hole data are filtered.

[00:13:31.490]
When it’s set to custom, only the data objects

[00:13:33.490]
specified in the inputs tab are filtered.

[00:13:37.160]
I will switch the boundary filter off now

[00:13:38.840]
and see how this affects the shape

[00:13:40.260]
of the quart porphyry intrusion surface.

[00:13:43.150]
Now that Leapfrog uses the data outside the current boundary

[00:13:46.280]
set to the surface.

[00:13:47.390]
You can see that the shape

[00:13:48.580]
of the intrusion surface has changed significantly.

[00:13:51.460]
Turning off the boundary filter can also be beneficial

[00:13:53.860]
in situations where your intrusion

[00:13:55.300]
has post-dated your faulting.

[00:13:58.510]
The next parameter that I would like to talk about

[00:14:00.550]
is called value clipping.

[00:14:02.340]
To change settings for the intrusion surface,

[00:14:04.370]
double-click on the contact surface in the Project Tree.

[00:14:07.130]
The value clipping tab is only available

[00:14:08.870]
for intrusion contact surfaces,

[00:14:11.530]
clipping caps values that are outside of the wrench,

[00:14:13.810]
that by the lower bound and the upper bound values.

[00:14:17.250]
For example, if you change the upper bound from 16 to 10,

[00:14:20.110]
distance values above 10 will be regarded as 10.

[00:14:24.128]
The automatic clipping setting has different effects based

[00:14:26.810]
on whether a global trend or structure trend

[00:14:28.900]
is set in trend tab.

[00:14:30.990]
When the global trend is applied Leapfrog Geo

[00:14:33.180]
automatically clips values.

[00:14:35.500]
That is the automatic clipping setting is do clipping

[00:14:38.270]
and Leapfrog Geo sets a lower bound

[00:14:40.120]
and upper bound from the data.

[00:14:42.800]
To disable clipping untick Automatic Clipping,

[00:14:45.300]
then untick Do Clipping.

[00:14:47.840]
To change the lower bound and upper bound,

[00:14:50.040]
untick automatic clipping, then change the values.

[00:14:53.616]
When the structural trend is applied,

[00:14:54.930]
Leapfrog Geo automatically doesn’t clip the values.

[00:14:57.750]
To clip values untick Automatic Clipping,

[00:14:59.970]
then tick Do Clipping again, Leapfrog Geo sets

[00:15:02.950]
their law bound and the upper bound values from the data.

[00:15:05.720]
And you can change them if required.

[00:15:08.640]
In this case, I will apply a manual clipping

[00:15:10.570]
to demonstrate how you can control the shape

[00:15:12.500]
of your intrusion surface,

[00:15:13.990]
but just in the value clipping parameters,

[00:15:17.770]
I will clip the upper bound to 6, then click okay.

[00:15:22.160]
The top part of the mesh has changed quite significantly

[00:15:25.340]
because we have limited data to control

[00:15:26.860]
the shape of the intrusion near the surface,

[00:15:28.790]
Leapfrog pushes the intrusion out

[00:15:31.030]
creating so-called blowout.

[00:15:33.600]
Value clipping can be used

[00:15:34.740]
effectively to control some of the areas with blowouts.

[00:15:39.110]
In some situations you won’t be able to get away by simply

[00:15:41.740]
adjusting surface parameters,

[00:15:43.570]
and you’ll have to use some other input data

[00:15:45.800]
whether it’s a polyline, point, structure

[00:15:47.830]
or other type of data.

[00:15:50.560]
I will demonstrate briefly how you can edit

[00:15:52.490]
an intrusion surface with a polyline.

[00:15:54.250]
In this example,

[00:15:55.190]
I have a small quartz porphyry intrusion surface

[00:15:57.190]
in one of the fault blocks

[00:15:58.820]
and I’ll edit it using a polyline line.

[00:16:02.770]
Right click on the intrusion surface

[00:16:04.150]
and select edit with polyline.

[00:16:05.960]
Now I can start editing my surface.

[00:16:07.780]
In this instance, I will use points

[00:16:09.440]
rather than for other than polylines

[00:16:10.360]
to control the intrusion surface.

[00:16:13.520]
Once I have clicked Save Button,

[00:16:15.760]
the surface is being reprocessed and the points

[00:16:18.210]
are added to the intrusion.

[00:16:20.840]
The last topic that I’d like to cover in this webinar

[00:16:23.040]
is guide points.

[00:16:24.610]
Guide points can be created from any category of point data

[00:16:27.220]
in the project and edit to surfaces.

[00:16:29.860]
Category data that can be used to create guide points,

[00:16:32.330]
include downhole category point data, LAS points,

[00:16:35.780]
category data in on imported points, interval points.

[00:16:40.790]
Before I continue onto the guide points,

[00:16:42.770]
I’ll look great into our mid points from my blast hole data.

[00:16:47.040]
Guide points are good way of using blast hole data

[00:16:49.170]
to control surfaces.

[00:16:50.450]
Create the guide points

[00:16:51.300]
from the downhole interval midpoints,

[00:16:53.390]
then add the guide points to the surface.

[00:16:56.630]
Guide points are classified into interior and exterior,

[00:16:59.210]
and each guide point is assigned a distance value

[00:17:01.720]
that is a distance to the nearest point.

[00:17:06.420]
Guide points are classified to the interior and exterior

[00:17:08.920]
and each guide point is assigned the distance value

[00:17:11.180]
that is the distance to the nearest point

[00:17:12.870]
on the opposite side.

[00:17:15.380]
Interior valleys are positive

[00:17:16.770]
and exterior valleys are negative.

[00:17:20.370]
To create guide points, right click on the Points folder

[00:17:22.850]
and select New Guide Points.

[00:17:24.120]
A window will appear listing the category columns

[00:17:27.120]
available in the project.

[00:17:29.790]
Slide the categories to assign to interior,

[00:17:32.450]
the positive side and exterior the negative side.

[00:17:35.630]
You can also filter out distant values

[00:17:37.410]
by clicking the ignore distant values box

[00:17:39.540]
and entering a value.

[00:17:41.130]
Often distinct values have little effect on the surface

[00:17:43.830]
and filtering out these can improve processing time.

[00:17:48.090]
Click okay the guide points will appear

[00:17:49.870]
in the Project Tree under the points folder.

[00:17:52.430]
Now I’m going to add these guide points

[00:17:54.080]
to my quartz porphyry intrusion surface.

[00:17:56.160]
Right-click on the Intrusion Surface and select Add Points.

[00:18:00.810]
From the list of points I will select the Guide Points

[00:18:02.950]
and click Okay.

[00:18:04.950]
As you can see, the surface has now been updated

[00:18:07.250]
to include guide points data.

[00:18:10.820]
On this, I will conclude

[00:18:11.850]
the demonstration part of this webinar.

[00:18:13.940]
I hope you found it to be useful

[00:18:15.370]
and learn something new today.

[00:18:18.200]
The information from today’s webinar may allow you to review

[00:18:20.740]
your approach to editing of intrusion surfaces

[00:18:23.050]
in your modeling process.

[00:18:25.760]
If you have any inquiries regarding today’s presentation

[00:18:28.070]
or other topics,

[00:18:29.070]
please do not hesitate to contact your local support team.

[00:18:34.010]
You can see the contact details

[00:18:35.220]
for your local regional support teams on your screens now.

[00:18:40.480]
Please feel free to reach out to your local support team,

[00:18:42.620]
if you have further questions required for modeling support

[00:18:45.350]
or would like to discuss a remote training session.

[00:18:49.140]
Thank you very much for joining this webinar

[00:18:50.910]
and we hope to talk to you soon.