- Add center dot hit test (axis 3) for the scale gizmo so hovering/
clicking the center circle performs uniform scale on all three axes.
Center is checked before HitTestAxes to prevent the pivot (which is
an endpoint of all three axis segments) from always resolving to X.
- Uniform scale uses screen-space pixel delta (right = grow, left =
shrink, 200 px ≈ ×2) instead of the world-space axis-line ratio.
The axis-line approach broke because the mouse starts at the pivot
(oT ≈ 0), making cT/oT explode on any small movement.
- Center dot highlights in orange and grows when hovered or active.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Rotate manipulator — correct axis bug:
- Object-space delta axis was set to initRot.GetRow3(axis) (a parent-space
vector) then applied in the prim's local frame via deltaM * initRot.
These frames are mismatched: the axis must be the canonical e_a so that
Rot(e_a) fixes e_a and the prim rotates purely about its own axis.
Fixed to use the canonical axis for both spaces; only composition order
differs (deltaM * initRot for object, initRot * deltaM for world).
Gizmo pivot placement:
- ComputeGizmoPivot() used the bounding-box centre (geometry centroid),
placing the gizmo at the wrong location for any non-centred prim.
Replaced with parentToWorld.Transform(translate + pivot) from
XformCommonAPI::GetXformVectors — the authored pivot point in world space.
Fallback for incompatible op stacks uses worldMatrix.ExtractTranslation().
Property panel:
- Show pivot (X/Y/Z) as read-only row below Scale, populated from
XformCommonAPI::GetXformVectors each frame.
- Removed active-rotate-axis display (was added and then removed per request).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
indigo