Spline placement: New Spline button (S key) enters placement mode where clicks
add control points. Right-click/Enter finishes, Escape cancels. Min 2 points.
Spline visualization as cross-shaped quad strip (vertical + horizontal ribbons).
Point editing: select spline to show handles, click a handle to position gizmo
on it, then use translate gizmo to move individual points. Undo supported via
full-state snapshots (SplinePointAction).
Visual feedback: auto-generated M_PS_Editor_SplineLine material (unlit opaque
with depth test) for normal state. Gizmo material (no depth test) for selected
state. Center cube at centroid for whole-spline selection. Handles highlight
on selection.
Serialization: spline points exported to CustomProperties (PointCount + Point_N).
C++ class fallback via FindObject for LoadScene. Spline appears in scene outliner.
Still WIP: depth material swap on selection, serialization edge cases, and
point editing polish to be refined.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
j.foucher
1f4b3994ff