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Add UMeshVertexPaintTool, subclass of UMeshSculptToolBase. Paints Mesh Vertex Colors (ie Asset colors, not instance colors). Provides many interactions similar to GroupPaintTool (ie brush paint, click-to-fill, poly-lasso, volumetric vs connected brush ROI, UV/Normal seams, visibility filter, etc. Supports painting split-vertex colors, or smooth per-vertex colors (bHardEdges setting). Supports various brush types (paint, smooth, "blend" = average split values). Painting supports custom color-blend modes (ie "over" mode, does stroke compositing like pixel painting tools). Can show vertex color under cursor. Supports showing vertex color or original materials. Ability to filter channels for visibility/painting. Actions buttons to fill current-color/black/white. "Utility" panel for common operations (blend all seams, fill channels, invert channels, copy channel to channel, swap channels, copy from weight map, copy to all/single LOD). Internally supports seam painting by splitting all colors on startup (ie to create per-triangle-vertex color) and then welding on shutdown. Current auto-RGBA conversions are inverted, internally the tool works in Linear colors, preview DynamicMeshComponent is configured to convert to SRGB in color buffers (similar to static mesh). Vertex color brush ops added in MeshVertexPaintBrushOps.h, deriving from new FMeshVertexColorBrushOp. Various color-blending functions implemented there, should be moved to centralized place eventually. Expose MeshVertexPaintTool in ModelingMode Add FModelingToolsColorChannelFilter, for toggling R/G/B/A filtering state, and a details customization that shows these four checkboxes in a horizontal row. Use in MeshVertexPaintTool, Register in Modeling Mode. #rb none #preflight 646cfc50205f5d23d53f80f1 [CL 25592458 by ryan schmidt in ue5-main branch]