The goal of this topic is to track the feasibility and interest for implementing SSAO for volume rendering in VTK / 3DSlicer. As highlighted by @lassoan in this post , SSAO for volumes could be a game-changer especially for the recent (and outstanding) colorized volume visualization presented here . …

Yesterday I could find the fix to bring back volume depth occlusion. The required change will be done in the coming days. I have a project to handle the integration of the depth mask change in VTK so I will start with that. For this we will use the vtkOpenActor::DepthMaskOverride information key. @…

You can set those information keys in Slicer in Python like this: threeDViewWidget = slicer.app.layoutManager().threeDWidget(0) vrDisplayableManager = threeDViewWidget.threeDView().displayableManagerByClassName("vtkMRMLVolumeRenderingDisplayableManager") volumeNode = slicer.mrmlScene.GetFirstNodeB…

Perfect, thanks. Eventually it will be enabled by default by the ssao pass so it won’t be required anymore. Same for the shaders replacement and modification of the ssao pass detp texture format. But for now, all the VTK hack from my volume-ssao branch can be replaced with: VTK!10642 makes it poss…

Thank you for working on this and for clarifying the roadmap. When I reviewed the VTK merge requests I was not sure if we’ll need all the low-level API calls to activate this feature, but it’s great to hear that it’ll be all seamlessly integrated into the existing SSAO feature! I’ll test this and le…

I’ve tried to apply all the VTK changes, enabled GLDepthMaskOverride, changed depth format, and added the shader replacement. Unfortunately, the volume disappears and this message is displayed: [VTK] 0(350) : error C1503: undefined variable "g_dataNormal" [VTK] Shader failed to compile Where g_dat…

Thanks a lot for following up on this. To answer your question, this is defined in the shader replacement that you must add on the application side for now. See the following code from previous comments: vtkShaderProgram::Substitute(fragmentShader, "//VTK::ComputeLighting::Dec", "vec3 g_dataN…

All the low level pending MRs have been merged into VTK and VTK!10725 handles shader replacements in the SSAO pass and is ready for reviews :tada: I plan to write a post on the Kitware blog to present the approach. If anyone wants to provide data or screenshots, that would be much appreciated. Mayb…

Great, thank you very much for all your work on this. I’ll test this and provide data and screenshots. I would also be happy to help with a blog post and probably write a short paper that can be cited, because I think this (along with colorizing volume using segmentation) may be a breakthrough in ut…

This is fascinating. Is there a way to test this feature ?

We’ll need a week or so to integrate and test all the VTK updates and then add GUI to Slicer to configure it.

Screen-space ambient occlusion for volume rendering

Development

Topic		Replies	Views
Improve ambient occlusion in volume rendering Development volume-rendering	10	1064	January 22, 2024
VTK multivolume/cinematic volume rendering Support	59	4587	September 3, 2024
Volume rendering colorized with segmentation Development segmentation , volume-rendering	26	2403	October 16, 2023
Highlighted VTK changes associated with Slicer 4.10: Virtual Reality, Rendering, Volume Rendering, Python Wraping, OpenGL performance and threading management Development	0	1866	October 29, 2018
Viewing a volume with two different volume rendering properties at same time Support volume-rendering	9	1567	March 8, 2021

Screen-space ambient occlusion for volume rendering

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