Dear community: I am starting to use the colorize volume extension, got my colorized volume, but can´t export it to .gltf through the OpenAnatomy export extension. My objective is to show the colorized volume online. Any hints would be welcomed. Best regards,

No, you won’t be able to do that since Colorized Volumes are RGBA image data but gltf only support polygonal surface data.

Thanks, Steve. This means that this module is only standalone for Slicer? I mean, its rendering is not displayable by the Online3DViewer, for instance? Best, Rafael

3dviewer can only display surface.models. try the Glance viewer from Kitware if you want to see the colorized voxels. I believe it supports rgb images Kitware Glance Data Viewer in a browser

Hello, An alternative to Kitware Glance is Kitware Volview, that is specialized in rendering of medical volumes. It is also a little bit more maintained. They are both based on vtk.js, and there are a lot of useful new features that are not used yet in Glance/Volview, so you could try using an exa…

@Rafael_V_Monteiro let us know what you find if you try VolView and/or Glance. In addition to vtk.js in native javascript, there is also a path to use traditional C ++ VTK with WebAssembly to render in browsers. Both of these rely on WebGL which can in theory render the RGBA volumes generated by th…

Absolutely Steve. I´ll look into it and report back. Thank you! Rafael

Dear @pieper , @muratmaga , @Thibault_Bruyere : I tried to play with the colorized model and displayed the model with the suggested viewers, Glance and Volview. My colorized model was as below: [coati colorized slicer] The only way I found out to export it to rgb capable formats was through the …

Thanks for testing this @Rafael_V_Monteiro . As noted above, in order to implement this feature we needed to fix the shader in VTK C++ to support using the alpha channel as opacity and configure the rendering pipeline to use that mode. I’m not sure any of the web based rendering systems support tha…

@Rafael_V_Monteiro in all your tests, the volume rendering was done with “independent components” flag enabled. Independent component means that the scalar components of the volume are rendered independently (not as a colored voxel). You need to set volumeProperty.SetIndependentComponents(false) if …

Export colorized volume to .gltf

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cpinter (Csaba Pinter) September 17, 2024, 10:30am 9

You cannot save a volume rendering, colorized or not. It is just a visual representation of volumetric data. I suggest reading this thread where this was discussed in detail:

Topic		Replies	Views
Retain Image Color in Volume Rendering Support	26	5488	April 18, 2021
How to export the Volume Rendering into models? Support	14	9447	March 26, 2020
VTK multivolume/cinematic volume rendering Support	59	4450	September 3, 2024
Save volume rendering as STL file Support segmentation , faq	40	30321	October 21, 2021
Texturize 3D model (ray tracing) Development visualization	7	1080	August 10, 2019

Export colorized volume to .gltf

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