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Box selection for entities #33

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opened 2026-03-19 06:08:50 +00:00 by kit · 0 comments
kit commented 2026-03-19 06:08:50 +00:00
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Summary

Add drag-to-select (box/marquee selection) for selecting multiple entities on screen at once.

Requirements

  • Click and drag draws a selection rectangle overlay on screen
  • On release, all entities whose screen-space bounding boxes intersect the rectangle are selected
  • Integrates with existing selection model: replaces selection by default, shift+drag adds to selection
  • Works when pointer is unlocked (cursor visible)
  • Visual: semi-transparent rectangle with border during drag

Implementation notes

  • Project entity positions (or bounding box corners) to screen space using camera.matrixWorldInverse + camera.projectionMatrix
  • Skip skybox entities and hidden entities (same filtering as single-click picking)
  • Need to handle the interaction between box select (unlocked) and the existing click-to-pick behavior — box select activates on drag, click-to-pick on click without drag
  • Consider performance for large entity counts — screen-space projection is cheap but doing it for hundreds of entities per frame during drag needs to stay smooth
## Summary Add drag-to-select (box/marquee selection) for selecting multiple entities on screen at once. ## Requirements - Click and drag draws a selection rectangle overlay on screen - On release, all entities whose screen-space bounding boxes intersect the rectangle are selected - Integrates with existing selection model: replaces selection by default, shift+drag adds to selection - Works when pointer is unlocked (cursor visible) - Visual: semi-transparent rectangle with border during drag ## Implementation notes - Project entity positions (or bounding box corners) to screen space using `camera.matrixWorldInverse` + `camera.projectionMatrix` - Skip skybox entities and hidden entities (same filtering as single-click picking) - Need to handle the interaction between box select (unlocked) and the existing click-to-pick behavior — box select activates on drag, click-to-pick on click without drag - Consider performance for large entity counts — screen-space projection is cheap but doing it for hundreds of entities per frame during drag needs to stay smooth
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kit/gmod-web-stream#33
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