Hello, I have a doubt in holding a displaynode using python. I have two buttons and two displaynodes… Each button set visibility of each displaynode.I press first button. It will set visibility of corresponding display node and hold it.Then I press second button it will display both nodes.
Your code is obviously not correct. However, without providing the code itself, nobody has a chance to help you.
Hello, this is code contain three functions for three buttons and I have to hold the visibility of node after pressing each button . Here I used displaynode.hold(True). But it is not giving proper result.
def showTransparentRendering(self, volumeNode, maxOpacity, gradientThreshold):
"""Make constant regions transparent and the entire volume somewhat transparent
:param maxOpacity: lower value makes the volume more transparent overall
(value is between 0.0 and 1.0)
:param gradientThreshold: regions that has gradient value below this threshold will be made transparent
(minimum value is 0.0, higher values make more tissues transparent, starting with soft tissues)
"""
# Get/create volume rendering display node
volRenLogic = slicer.modules.volumerendering.logic()
displayNode = volRenLogic.GetFirstVolumeRenderingDisplayNode(volumeNode)
if not displayNode:
displayNode = volRenLogic.CreateDefaultVolumeRenderingNodes(volumeNode)
# Set up gradient vs opacity transfer function
gradientOpacityTransferFunction = displayNode.GetVolumePropertyNode().GetVolumeProperty().GetGradientOpacity()
gradientOpacityTransferFunction.RemoveAllPoints()
gradientOpacityTransferFunction.AddPoint(300.0, 0.0)
gradientOpacityTransferFunction.AddPoint(3070.0, maxOpacity)
gradientOpacityTransferFunction.AddPoint(gradientThreshold+1, maxOpacity)
TransferFunction=displayNode.GetVolumePropertyNode().GetVolumeProperty().GetScalarOpacity()
TransferFunction.RemoveAllPoints()
TransferFunction.AddPoint(300.0, 0.0)
TransferFunction.AddPoint(3070.0, maxOpacity)
TransferFunction.AddPoint(gradientThreshold+1, maxOpacity)
displayNode.SetVisibility(True)
def onpushButton(self) -> None:
"""
Run processing when user clicks "First Rendering" button.
Calling update_parameters fuction for updating display of r1,r2,r3 parameters.
Parameters:
r1:float
r2:float
r3:float
"""
self.logic.process_1(self.ui.inputSelector)
""" Storing corresponding nodes in r1,r2,r3 parameters."""
r1 = slicer.mrmlScene.GetFirstNodeByName('220074_pelvis')
r2 = slicer.mrmlScene.GetFirstNodeByName('220074_knee')
r3 = slicer.mrmlScene.GetFirstNodeByName("220074_ankle")
""" Setting current node to r1."""
self.ui.inputSelector.setCurrentNode(r1)
volRenLogic1 = slicer.modules.volumerendering.logic()
displayNode1 = volRenLogic1.CreateDefaultVolumeRenderingNodes(r1)
displayNode1.hold(True)
volumePropertyNode = displayNode1.GetVolumePropertyNode()
preset = volRenLogic1.GetPresetByName('CT-AAA')
volumePropertyNode.Copy(preset)
self.showTransparentRendering(r1, 1,300.0)
""" Accessing the volume rendering module.
Creating a display node.
Setting visibility of corresponding node.
"""
volRenLogic2 = slicer.modules.volumerendering.logic()
displayNode2 = volRenLogic2.CreateDefaultVolumeRenderingNodes(r2)
displayNode2.SetVisibility(False)
""" Accessing the volume rendering module.
Creating a display node.
Setting visibility of corresponding node.
"""
volRenLogic3 = slicer.modules.volumerendering.logic()
displayNode3 = volRenLogic3.CreateDefaultVolumeRenderingNodes(r3)
displayNode3.SetVisibility(False)
""" Center and fit displayed content in 3D view in the direction of anterior position."""
view = slicer.app.layoutManager().threeDWidget(0).threeDController()
view.resetFocalPoint()
view.lookFromAxis(ctk.ctkAxesWidget.Anterior)
view.setOrthographicModeEnabled(True)
def onpushButton_2(self) -> None:
"""
Run processing when user clicks "second Rendering" button.
Calling update_parameters fuction for updating display of r1,r2,r3 parameters.
Parameters:
r1:float
r2:float
r3:float
"""
self.logic.process_2(self.ui.inputSelector_1)
""" Storing corresponding nodes in r1,r2,r3 parameters."""
r1 = slicer.mrmlScene.GetFirstNodeByName('220074_pelvis')
r2 = slicer.mrmlScene.GetFirstNodeByName('220074_knee')
r3 = slicer.mrmlScene.GetFirstNodeByName("220074_ankle")
""" Setting current node to r2."""
self.ui.inputSelector_1.setCurrentNode(r2)
volRenLogic2 = slicer.modules.volumerendering.logic()
displayNode2 = volRenLogic2.CreateDefaultVolumeRenderingNodes(r2)
displayNode2.hold(True)
volumePropertyNode = displayNode2.GetVolumePropertyNode()
preset = volRenLogic2.GetPresetByName('CT-AAA')
volumePropertyNode.Copy(preset)
self.showTransparentRendering(r2, 1, 300.0)
""" Accessing the volume rendering module.
Creating a display node.
Setting visibility of corresponding node.
"""
volRenLogic1 = slicer.modules.volumerendering.logic()
displayNode1 = volRenLogic1.CreateDefaultVolumeRenderingNodes(r1)
displayNode1.SetVisibility(False)
""" Accessing the volume rendering module.
Creating a display node.
Setting visibility of corresponding node.
"""
volRenLogic3 = slicer.modules.volumerendering.logic()
displayNode3 = volRenLogic3.CreateDefaultVolumeRenderingNodes(r3)
displayNode3.SetVisibility(False)
""" Center and fit displayed content in 3D view in the direction of anterior position."""
view1 = slicer.app.layoutManager().threeDWidget(0).threeDController()
view1.resetFocalPoint()
view1.lookFromAxis(ctk.ctkAxesWidget.Anterior)
view1.setOrthographicModeEnabled(True)
def onpushButton_3(self) -> None:
"""
Run processing when user clicks "Third Rendering" button.
Calling update_parameters fuction for updating display of r1,r2,r3 parameters.
Parameters:
r1:float
r2:float
r3:float
"""
self.logic.process_3(self.ui.inputSelector_2)
""" Storing corresponding nodes in r1,r2,r3 parameters."""
r1 = slicer.mrmlScene.GetFirstNodeByName('220074_pelvis')
r2 = slicer.mrmlScene.GetFirstNodeByName('220074_knee')
r3 = slicer.mrmlScene.GetFirstNodeByName("220074_ankle")
""" Setting current node to r3."""
self.ui.inputSelector_2.setCurrentNode(r3)
volRenLogic3 = slicer.modules.volumerendering.logic()
displayNode3 = volRenLogic3.CreateDefaultVolumeRenderingNodes(r3)
volumePropertyNode = displayNode3.GetVolumePropertyNode()
preset = volRenLogic3.GetPresetByName('CT-AAA')
volumePropertyNode.Copy(preset)
self.showTransparentRendering(r3, 1, 300.0)
""" Accessing the volume rendering module.
Creating a display node.
Setting visibility of corresponding node.
"""
volRenLogic1 = slicer.modules.volumerendering.logic()
displayNode1 = volRenLogic1.CreateDefaultVolumeRenderingNodes(r1)
displayNode1.SetVisibility(False)
""" Accessing the volume rendering module.
Creating a display node.
Setting visibility of corresponding node.
"""
volRenLogic3 = slicer.modules.volumerendering.logic()
displayNode3 = volRenLogic3.CreateDefaultVolumeRenderingNodes(r2)
displayNode3.SetVisibility(False)
""" Center and fit displayed content in 3D view in the direction of anterior position."""
view2 = slicer.app.layoutManager().threeDWidget(0).threeDController()
view2.resetFocalPoint()
view2.lookFromAxis(ctk.ctkAxesWidget.Anterior)
view2.setOrthographicModeEnabled(True)
Your code seems to be more complicated than it could be.
First of all, I suggest revising it carefully, because mixing up volume node numbers and display node numbers surely cause issues. For example
displayNode3 = volRenLogic3.CreateDefaultVolumeRenderingNodes(r2)
Here you’ll think that displayNode3 corresponds to volume r3, but it really corresponds to r2.