How to Visualize in OpendTect

Layers and Transparency, Volume Rendering & Iso surfaces

Geert de Bruin

Introduction

OpendTect is a powerful tool for attribute analysis and advanced object detection

Visualizing the results is almost as important as the results themselves, therefore OpendTect has several advanced visualization options

This presentation helps you to get best out of OpendTect: layers, transparency, color-bars, volume rendering and iso surfaces

Overview

Working with attribute layers and transparency

Visualizing data in 3D: Volume rendering

Iso-surfaces (prototype)

Working with attribute layers

In OpendTect one element (inline, crossline, time-slice, horizon, random-line) can have multiple attribute displays or layersThe attribute on layer 2 is

masking the seismic data on layer 1. Therefore we make the second layer (partially) transparent

Layer 1: Seismic data

Layer 2: Attribute

1) Uniform transparency2) Part transparent /

part opaque

Part transparent / part opaque

The concept is to make a certain value-domain completely transparent (low attribute values), while keeping the other values opaque (high attribute values).

Workflow in OpendTect

1) Display seismic data

2) Right click on the element and select “add attribute”

Workflow in OpendTect

Tip: Shift + Arrow Up/Down To changes the order

1) Display seismic data

2) Right click on the element and select “add attribute”

3) Display an attribute on the new layer

4) Select the layer and choose the color-bar “chimney”

Workflow in OpendTect

Right click on the color-bar to flip or edit it

http://www2.opendtect.org/rel/html/index.html

Consult OpendTect user-documentation

Uniform transparency

Uniform transparency is equally simple to perform

Uniform transparency

Layer 1 Seismic Data

Uniform transparency

Layer 1 Seismic Data

Layer 2 Acoustic impedance

Uniform transparency

Uniform transparency

Overview

Working with attribute layers and transparency

Visualizing data in 3D: Volume rendering

Iso-surfaces (prototype)

Visualizing data in 3D: Volume rendering

Display an attribute in a volume viewer. Make a certain value-domain completely transparent (low attribute values), while keeping the other values opaque (high attribute values).

Volume rendering

1) Add a volume and position it

1) Add a volume and position it

2) Load the attribute

3) Deselect “inline crossline and time” & select “volren”

1) Add a volume and position it

2) Load the attribute

3) Deselect “inline crossline and time” & select “volren”

4) Choose a color-bar with transparency (Chimney)

Overview

Working with attribute layers and transparency

Visualizing data in 3D: Volume rendering

Iso-surfaces (prototype)

Iso surface

1) Add a volume and load the attribute data

2) Right click in the volume item in the tree and select Add> Iso surface

The color of the isosurface corresponds to the color in the color bar at the value of the isosurface (ignoring transparency)

Changing the iso value will thus result in a different color and shape

Iso surface: ChimneyCube