Add interactive hierarchy visualization for clustered 3D reconstruction#1089
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nilakarthikesan wants to merge 2 commits into
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Add interactive hierarchy visualization for clustered 3D reconstruction#1089nilakarthikesan wants to merge 2 commits into
nilakarthikesan wants to merge 2 commits into
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Web-based Three.js visualization that shows how the GTSfM hierarchical clustering pipeline progressively merges VGGT cluster reconstructions into a complete building model. Key features: - Camera-based orientation: automatically computes scene orientation from COLMAP camera poses (images.txt) instead of hardcoded rotations - Squareness-optimized layout: exhaustive partition search at each tree level to maximize tile squareness and fill the screen efficiently - Per-point alpha blending: smooth merge transitions where matched points interpolate positions and unmatched points fly to nearest counterparts - Built-in recording: capture the visualization as a .webm video See visualization/hierarchy-web/README.md for setup and usage instructions. Made-with: Cursor
Add detailed explanations of: - Camera-based orientation (parsing COLMAP poses, averaging up-vectors, building orthonormal rotation matrix) - Squareness-optimized layout (exhaustive partition search, proportional weighting, recursive subdivision) - Per-point alpha blending (nearest-neighbor matching, three-category point interpolation, cubic easing) - Full timeline sequence description - Recording instructions Made-with: Cursor
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Summary
Adds a web-based Three.js visualization (
visualization/hierarchy-web/) that interactively shows how the GTSfM hierarchical clustering pipeline progressively merges VGGT cluster reconstructions into a complete building model.Camera-based orientation: Automatically computes scene orientation from COLMAP camera poses (
images.txt) by averaging camera up-vectors and computing camera-to-building direction. Produces a mathematically derived rotation matrix -- no hardcoded angles. Works for any dataset.Squareness-optimized layout: At each tree level, exhaustively searches all possible row/column groupings (2^(n-1) partitions) to maximize worst-case tile squareness. Clusters fill the screen efficiently in a grid-like arrangement.
Per-point alpha blending: During merge transitions, matched points smoothly interpolate from child to merged positions using cubic easing. Unmatched child points fly to nearest merged counterparts; unmatched merged points fly from nearest child points.
Built-in recording: One-click Record button captures the visualization as a
.webmvideo using the MediaRecorder API.How to Run
See
visualization/hierarchy-web/README.mdfor full setup details.Files Added
visualization/hierarchy-web/hierarchy-vggt.html-- Main page with UI and stylingvisualization/hierarchy-web/js/data-loader-vggt.js-- Point cloud and camera extrinsic loadingvisualization/hierarchy-web/js/layout-engine-squareness.js-- Recursive layout algorithmvisualization/hierarchy-web/js/animation-engine-squareness.js-- Timeline and merge animationsvisualization/hierarchy-web/js/main-hierarchy-vggt.js-- App entry point, scene setup, recordingvisualization/hierarchy-web/js/camera-engine.js-- Camera flythrough supportvisualization/hierarchy-web/js/interaction-engine.js-- Mouse interactionvisualization/hierarchy-web/README.md-- Setup and usage instructionsTest Plan
data/gerrard-hall-vggt/results/, start server, open visualization