Bloom

Bloom is a camera/display response to bright HDR signal. Establish scene exposure and emissive luminance before tuning blur.

Workflow

1. Inspect pre-tone-map luminance.
2. Choose which scene values should bloom.
3. Choose a single-node or dual selective-render ownership model.
4. Calibrate threshold, radius, smooth width, and strength in HDR.
5. Restore all substituted materials transactionally for selective passes.
6. Composite before exposure/tone mapping.
7. Validate base, contribution, and final views.

Read references/hdr-bloom-system.md for the HDR ordering, dual selective-bloom transaction, compact emissive hierarchy, and the costs and limits of each ownership model.