User feedback: the self-drawn scale handles clash visually with the
ImGuizmo translate/rotate rods (different size/style, clearly not one
widget). Keep the library widget for all three ops for visual
consistency and prevent mis-drags by masking degenerate axes via
SetAxisMask:
- translate: axis ~ parallel to camera-to-object line (sin < 0.25)
- scale: axis ~ perpendicular to camera-to-object line (|dot| < 0.1,
intersection numerator identically zero -> grab fails/values jump)
OR axis ~ parallel to view direction (|dot| > 0.98, zero screen
displacement -> value never changes)
- rotate: screen-space math, no degeneracy, no mask
Masked axes are neither drawn nor activatable; a slight view change
restores them. Center uniform-scale square (MT_SCALE_XYZ, pure screen
space) stays available in any view.
atdunbg
9ff08651f0