Fix Gaussian splat Vulkan render target setup

CHANGELOG.md

@@ -4,6 +4,7 @@
 -   Add vcpkg support for easier dependency management (PR #7386)
 -   Exposed advanced parameters (`full_depth`, `samples_per_node`, `point_weight`) for Poisson surface reconstruction in `TriangleMesh.create_from_point_cloud_poisson` (PR #7430) (issue #7248)
 -   Add SYCL tensor backends for HashMap, nearest-neighbor search (KNN, fixed-radius, hybrid), geometry transforms, and registration / odometry / feature pipelines (parity with CUDA paths where applicable).
+-   Fix Gaussian Splat rendering on Vulkan by disabling view MSAA before binding a render target with sampleable depth (issue #7495).
 -   Add compressed SPZ file I/O for tensor-based Gaussian splats, with zstd dependency integration, round-trip tests, and notebook samples.
 -   Add Windows shared-library CUDA and SYCL Python wheels (`open3d-cuda`, `open3d-xpu`) built against the installed devel package; ship NVIDIA CUDA 12.6 runtime pip dependencies (`python/requirements_win_cuda.txt`) since CUDA is linked dynamically on Windows
 -   Fix WebRTC prebuilt packaging and CI workflow across Linux, macOS arm64, and Windows runtime variants (PR #7515)

cpp/open3d/visualization/rendering/gaussian_splat/GaussianSplatVulkanBackend.cpp

@@ -179,12 +179,14 @@ class GaussianSplatVulkanBackend final : public GaussianSplatRenderer::Backend {
             targets.render_target =
                     resource_mgr.CreateRenderTarget(view_color, targets.depth);
         }
-        view.SetRenderTarget(targets.render_target);
-
         auto* native = view.GetNativeView();
         auto msaa = native->getMultiSampleAntiAliasingOptions();
         msaa.enabled = false;
         native->setMultiSampleAntiAliasingOptions(msaa);
+
+        // Filament rejects sampleable depth targets while MSAA is enabled, so
+        // update the view before binding the shared depth render target.
+        view.SetRenderTarget(targets.render_target);
         view.SetPostProcessing(false);
 
         return static_cast<bool>(targets.render_target);