工具：DimensionArrows
DimensionArrows(A, B, rhs, padding, width, head, shaft)
- A, B: anchors (3D points)
- rhs: right-hand side direction (3D vector)
- padding: padding between anchors and arrows
- width: arrow head width
- head: arrow head height ratio (proportional to width)
- shaft: shaft ratio (proportional to total length)