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Added Gaussian Splat Renderer Support - #29729 Adds 3D Gaussian Splatting support to `ptcloud`: a loader for trained scenes and a `viz3d` renderer that draws them alpha-blended and depth-sorted alongside existing opaque geometry. ### Result <img width="1842" height="811" alt="splat" src="https://github.com/user-attachments/assets/abfa5c01-6dbb-4367-b426-a618e3748649" /> [.splat source](https://huggingface.co/cakewalk/splat-data/resolve/main/train.splat) ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [ ] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake