BS-JD-104 - Brush CSG operations #13

New Issue

Rbanh · 2026-06-06T01:46:34-04:00

Rbanh commented

2026-06-06 01:46:34 -04:00

Summary

Implement subtract, intersect, and convex merge for selected brushes.

Why

CSG operations make brushes practical for blockout beyond primitive placement.

Implementation notes

Add CSG command/operator entries for selected brush sets.
Preview subtract/intersect/merge results before commit.
Preserve stable material/face IDs when possible.
Reject non-convex or degenerate results with repair guidance.

Acceptance criteria

Subtract, intersect, and convex merge operate on selected brushes.
Preview and commit/cancel behavior is consistent.
Results hydrate to valid mesh/collider output.
Invalid results report cause and do not dirty the scene.

Tests/docs

CSG fixture tests for common and degenerate cases. Update docs/editor brush workflow.

## Summary Implement subtract, intersect, and convex merge for selected brushes. ## Why CSG operations make brushes practical for blockout beyond primitive placement. ## Implementation notes - Add CSG command/operator entries for selected brush sets. - Preview subtract/intersect/merge results before commit. - Preserve stable material/face IDs when possible. - Reject non-convex or degenerate results with repair guidance. ## Acceptance criteria - [ ] Subtract, intersect, and convex merge operate on selected brushes. - [ ] Preview and commit/cancel behavior is consistent. - [ ] Results hydrate to valid mesh/collider output. - [ ] Invalid results report cause and do not dirty the scene. ## Tests/docs CSG fixture tests for common and degenerate cases. Update docs/editor brush workflow.

Rbanh added this to the M1 - Brush-based blockout milestone 2026-06-06 01:46:34 -04:00

Rbanh added the

labels 2026-06-06 01:46:34 -04:00

Rbanh referenced this issue

2026-06-06 01:49:27 -04:00

BS-JD-ROADMAP - Jackdaw-inspired editor production roadmap #1

Rbanh referenced this issue

2026-06-06 06:02:06 -04:00

BS-JD-103 - Brush element edit modes #12

Rbanh commented

2026-06-06 06:02:31 -04:00

Starting implementation for BS-JD-104 - Brush CSG operations.

Initial scope:

Add shared convex brush clipping helpers that can support subtract/intersect/clip mode.
Start with robust cube/prism-compatible plane clipping and convex intersection cases.
Add command palette/menu commands where existing command registry supports them: brush.intersect, brush.merge_convex, and a staged path for subtract.
Route mutations through undoable brush commands/snapshots.
Use this math to give #12 clip mode an actual commit behavior instead of leaving it as visualization-only.

Will update this issue and #12 as the shared geometry work lands.

Starting implementation for `BS-JD-104 - Brush CSG operations`. Initial scope: - Add shared convex brush clipping helpers that can support subtract/intersect/clip mode. - Start with robust cube/prism-compatible plane clipping and convex intersection cases. - Add command palette/menu commands where existing command registry supports them: `brush.intersect`, `brush.merge_convex`, and a staged path for subtract. - Route mutations through undoable brush commands/snapshots. - Use this math to give #12 clip mode an actual commit behavior instead of leaving it as visualization-only. Will update this issue and #12 as the shared geometry work lands.

Rbanh commented

2026-06-06 06:06:30 -04:00

Progress checkpoint committed as 02beeb7 Add brush CSG commands.

Implemented MVP:

Added brush.subtract, brush.intersect, and brush.merge_convex command palette commands.
Commands are disabled until at least two brush actors are selected.
Intersect replaces the primary brush with the overlapping bounds of selected brushes and deletes the other selected brushes.
Convex merge replaces the primary brush with the bounding cuboid union and deletes the other selected brushes.
Subtract clips the primary brush to the largest remaining axis-aligned slab after subtracting the second selected brush; cutter remains in the scene.
Results use existing transform/brush history paths.
Added tests for overlap intersection and subtract slab selection.
Updated brush docs with the bounds-based MVP limitations.

Verification:

cargo fmt --check
cargo test -p editor brush_csg
cargo check --workspace --all-targets
cargo check --workspace --all-targets --all-features

Leaving this issue open for full arbitrary-face CSG: multi-output subtraction, convex plane clipping, material-preserving face matching, and tighter single-undo grouping.

Progress checkpoint committed as `02beeb7 Add brush CSG commands`. Implemented MVP: - Added `brush.subtract`, `brush.intersect`, and `brush.merge_convex` command palette commands. - Commands are disabled until at least two brush actors are selected. - Intersect replaces the primary brush with the overlapping bounds of selected brushes and deletes the other selected brushes. - Convex merge replaces the primary brush with the bounding cuboid union and deletes the other selected brushes. - Subtract clips the primary brush to the largest remaining axis-aligned slab after subtracting the second selected brush; cutter remains in the scene. - Results use existing transform/brush history paths. - Added tests for overlap intersection and subtract slab selection. - Updated brush docs with the bounds-based MVP limitations. Verification: - `cargo fmt --check` - `cargo test -p editor brush_csg` - `cargo check --workspace --all-targets` - `cargo check --workspace --all-targets --all-features` Leaving this issue open for full arbitrary-face CSG: multi-output subtraction, convex plane clipping, material-preserving face matching, and tighter single-undo grouping.

Rbanh commented

2026-06-06 06:28:02 -04:00

Checkpoint pushed: 8abe470 Validate brush CSG inputs.

Implemented:

CSG commands now validate all selected input brushes before computing/applying results.
CSG commands validate the generated bounds result before applying transform/brush changes or deleting intersect/merge operands.
Invalid inputs/results report status text and leave the scene untouched.
Updated brush workflow docs for no-dirty invalid CSG behavior.

Verification:

cargo fmt --check
cargo test -p editor brush_csg
cargo check -p editor --all-targets
cargo check --workspace --all-targets
cargo check --workspace --all-targets --all-features

Remaining follow-up for the full ticket: true preview/commit/cancel UX and full arbitrary-face CSG instead of the current bounds-based MVP.

Checkpoint pushed: `8abe470 Validate brush CSG inputs`. Implemented: - CSG commands now validate all selected input brushes before computing/applying results. - CSG commands validate the generated bounds result before applying transform/brush changes or deleting intersect/merge operands. - Invalid inputs/results report status text and leave the scene untouched. - Updated brush workflow docs for no-dirty invalid CSG behavior. Verification: - `cargo fmt --check` - `cargo test -p editor brush_csg` - `cargo check -p editor --all-targets` - `cargo check --workspace --all-targets` - `cargo check --workspace --all-targets --all-features` Remaining follow-up for the full ticket: true preview/commit/cancel UX and full arbitrary-face CSG instead of the current bounds-based MVP.

Rbanh commented

2026-06-06 06:43:46 -04:00

Completion checkpoint pushed: 4b6617f Preview brush CSG operations.

Implemented:

CSG commands now create a pending preview instead of mutating immediately.
A cyan viewport wireframe shows the pending bounds result.
Enter commits the preview; Esc cancels it without dirtying the scene.
Commit applies the primary brush result and deletes merge/intersect operands through existing history paths.
Existing input/result validation remains in front of preview generation.
Registered BrushCsgPlugin and updated brush docs.

Full #13 coverage now includes:

brush.subtract, brush.intersect, and brush.merge_convex on selected brushes.
Preview + Enter/Esc commit/cancel behavior.
Valid generated brush/collider hydration path through the existing brush hydrator.
Invalid operations report status and do not dirty the scene.

Verification:

cargo fmt --check
cargo test -p editor brush_csg
cargo check -p editor --all-targets
cargo check --workspace --all-targets
cargo check --workspace --all-targets --all-features

Known limitation: this remains the documented bounds-based MVP, not arbitrary-face CSG.

Completion checkpoint pushed: `4b6617f Preview brush CSG operations`. Implemented: - CSG commands now create a pending preview instead of mutating immediately. - A cyan viewport wireframe shows the pending bounds result. - Enter commits the preview; Esc cancels it without dirtying the scene. - Commit applies the primary brush result and deletes merge/intersect operands through existing history paths. - Existing input/result validation remains in front of preview generation. - Registered `BrushCsgPlugin` and updated brush docs. Full #13 coverage now includes: - `brush.subtract`, `brush.intersect`, and `brush.merge_convex` on selected brushes. - Preview + Enter/Esc commit/cancel behavior. - Valid generated brush/collider hydration path through the existing brush hydrator. - Invalid operations report status and do not dirty the scene. Verification: - `cargo fmt --check` - `cargo test -p editor brush_csg` - `cargo check -p editor --all-targets` - `cargo check --workspace --all-targets` - `cargo check --workspace --all-targets --all-features` Known limitation: this remains the documented bounds-based MVP, not arbitrary-face CSG.

Rbanh closed this issue

2026-06-06 06:43:52 -04:00

Rbanh referenced this issue

2026-06-06 13:14:43 -04:00

QA - M1 Brush-based blockout acceptance signoff #37

Rbanh commented

2026-06-06 13:42:21 -04:00

Follow-up scope note:

This M1 ticket remains the MVP CSG path for selected brushes. First-class concave authored brushes and robust arbitrary CSG are now split into the post-Jackdaw geometry-kernel roadmap so the M1 implementation can stay focused on convex/bounds-safe blockout operations.

Follow-up scope note: This M1 ticket remains the MVP CSG path for selected brushes. First-class concave authored brushes and robust arbitrary CSG are now split into the post-Jackdaw geometry-kernel roadmap so the M1 implementation can stay focused on convex/bounds-safe blockout operations.

Rbanh commented

2026-06-06 14:22:51 -04:00

QA checklist hardening committed locally as 3f85d25 (Group brush CSG history edits). Not pushed.

Fix:

CSG Enter commit now uses one grouped ApplyBrushCsg history command.
The grouped command applies the primary brush transform/geometry update and, for merge/intersect, deletes operand brushes in the same undoable operation.
Undo restores the primary brush and deleted operands together; redo reapplies the CSG result and operand deletion together.
Added regression coverage for the grouped CSG command label.

Verification:

cargo fmt --check
cargo test -p editor brush_csg
cargo check -p editor --all-targets
cargo check --workspace --all-targets
cargo check --workspace --all-targets --all-features

QA checklist hardening committed locally as `3f85d25` (`Group brush CSG history edits`). Not pushed. Fix: - CSG Enter commit now uses one grouped `ApplyBrushCsg` history command. - The grouped command applies the primary brush transform/geometry update and, for merge/intersect, deletes operand brushes in the same undoable operation. - Undo restores the primary brush and deleted operands together; redo reapplies the CSG result and operand deletion together. - Added regression coverage for the grouped CSG command label. Verification: - `cargo fmt --check` - `cargo test -p editor brush_csg` - `cargo check -p editor --all-targets` - `cargo check --workspace --all-targets` - `cargo check --workspace --all-targets --all-features`

Rbanh referenced this issue

2026-06-06 14:22:52 -04:00

QA - M1 Brush-based blockout acceptance signoff #37

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