Scan Positioning

Scan-derived overlays and voxels must follow a strict coordinate policy.

Core rule

Island scan inputs already use transformed world-space geometry (rotation, scale, and lift applied during scan preparation).

Therefore, render-time code must avoid double-applying transform components.

Helper policy

Use centralized scan-positioning helpers for:

• Layer index → world Z conversion
• Outer visualization group positioning behavior

Practical guidance

• Reapply only the intended post-scan visual attachment behavior.
• Do not reapply baked rotation/lift when scan outputs already encode them.
• Keep all scan-based features aligned to the same helper policy.

Common regression patterns

• Double-lift in Z after rescan
• Rotation being applied twice in overlay rendering
• Feature-specific ad hoc positioning diverging from shared helper behavior