2010 NAMIC Project week: Programmatic use of Volume Rendering module

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  Projects List

Key Investigators

• BWH: Andriy Fedorov
• NCI: Yanling Liu
• Isomics: Alex Yarmarkovich

Objective

A number of modules in Slicer use volume rendering. However, none of them is using this functionality from Volume Rendering module in Slicer.

The objective of this project is to:

• provide example code (Tcl and/or C++) that allows to use volume rendering programmatically
• confirm that all the needed functionality available from volume rendering GUI is available from Tcl/C++ interfaces
• convert the existing modules that use VTK volume rendering to use the volume rendering module functionality

Questions to study:

• difference in performance and appearance between rendering label maps and greyscale images
• GPU/CPU switch while using pure VTK volume rendering

Approach, Plan

We will go through the basic functionality needed to add volume rendering to the code:

• create volume rendering scene
• visibility on/off
• initialization of the opacity and color transfer maps
• switching between the volume rendering techniques and automatic identification of the techniques available on a given machine

Our hope is that by the end of the week this page will be self-contained for adding volume rendering to any GUI Slicer module.

Progress

Delivery Mechanism

The following Tcl code provides the guidelines for implementation:

# Initialization

set scene $::slicer3::MRMLScene

set scenario [vtkMRMLVolumeRenderingScenarioNode New]
set property [vtkMRMLVolumePropertyNode New]
set parameters [vtkMRMLVolumeRenderingParametersNode New]

$scene AddNode $property
$scene AddNode $parameters

$parameters SetAndObserveVolumeNodeID "vtkMRMLScalarVolumeNode1"
$parameters SetAndObserveVolumePropertyNodeID [$property GetID]
$scenario SetParametersNodeID [$parameters GetID]

$scene AddNode $scenario

# on/off
set vtGUI $::slicer3::VolumeRenderingGUI
set vrLogic [$vrGUI GetLogic]

$vrLogic SetVolumeVisibility 0

# initialize opacity mapping

# initialize color mapping

# switch between rendering technique

# detect the available rendering techniques

References