PW42_2025_GranCanaria: Add project LightingProblemsWithLatestSlicervr

PW42_2025_GranCanaria/Projects/LightingProblemsWithLatestSlicervr/README.md

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+---
+layout: pw42-project
+
+permalink: /:path/
+
+project_title: Lighting problems with latest SlicerVR
+category: VR/AR and Rendering
+
+key_investigators:
+
+- name: Csaba Pinter
+  affiliation: EBATINCA
+  country: Spain
+
+- name: Andras Lasso
+  affiliation: PerkLab
+  country: Queen's, Canada
+
+- name: Matt Jolley
+  affiliation: CHOP
+  country: USA
+
+- name: Kitware?
+  affiliation: Jc / Thibault
+
+---
+
+# Project Description
+
+<!-- Add a short paragraph describing the project. -->
+
+
+There is a regression with how latest SlicerVR lights the scene, both with the old VR and the new XR backend.
+- OpenVR: Default lighting looks as expected, but now SSAO and Lights module options are not applied on the VR view (even if the view node IDs are explicitly selected)
+- OpenXR: Default lighting looks washed out
+
+
+
+## Objective
+
+<!-- Describe here WHAT you would like to achieve (what you will have as end result). -->
+
+
+1. Make both backends of SlicerVR work like before the regression
+    * "Normal" lighting by default
+    * Lights module changes have effect on VR view as well
+
+
+
+## Approach and Plan
+
+<!-- Describe here HOW you would like to achieve the objectives stated above. -->
+
+
+1. Investigate the problem with the help of people directly involved in the OpenXR integration
+2. If we find the root cause of either issues, try to address them
+
+
+
+## Progress and Next Steps
+
+<!-- Update this section as you make progress, describing of what you have ACTUALLY DONE.
+     If there are specific steps that you could not complete then you can describe them here, too. -->
+
+
+1. Describe specific steps you **have actually done**.
+
+
+
+
+# Illustrations
+
+<!-- Add pictures and links to videos that demonstrate what has been accomplished. -->
+
+
+The following screenshots demonstrate shadows vs no shadows in OpenVR: 
+
+![Image](https://github.com/user-attachments/assets/ac45a49c-078f-4661-a645-81994a1fcfc5)
+Left: Slicer view using OpenVR without shadows 
+Right: VR view (with back lights / without two sided lighting)
+
+![Image](https://github.com/user-attachments/assets/f39ce58a-36a3-4f22-87e0-9a389a87eb2d)
+Left: Slicer view using OpenVR with shadows
+Right: VR view  (with back lights / without two sided lighting)
+
+
+__________________________________________________________________________________________________________
+
+The following screenshots demonstrate different lighting options in OpenXR: 
+
+![Image](https://github.com/user-attachments/assets/a12e9d9a-6ce9-427e-b274-044118f1c1a3)
+Left: Slicer view using OpenXR without shadows 
+Right: VR view (with back lights / without two sided lighting) 
+
+![Image](https://github.com/user-attachments/assets/750f488b-e02b-45ce-9772-762ae1924691)
+Left: Slicer view using OpenXR without shadows 
+Right: VR view (without back lights / without two sided lighting) 
+
+
+
+
+# Background and References
+
+<!-- If you developed any software, include link to the source code repository.
+     If possible, also add links to sample data, and to any relevant publications. -->
+
+
+For those who have access to SlicerHeart internals, this is the link to the issue: https://github.com/JolleyLab/Internal/issues/205#event-14879920416
+