ID 267377 - World space manipulator doesn’t rotate light uniformly around COI in orthographic view

Problem summary

When in an orthographic view, the world space manipulator should give the same rotation as the manipulator whose axis we are looking down. However, while the rotation in the axis manipulator (green in the screenshot below) is uniform, the rotation in the world space manipulator isn’t.

Steps to reproduce

In a new Katana scene, create a PrimitiveCreate node and add a GafferThree node.
Create a light in the GafferThree.
Expand the scene graph and in the Viewer, change to the top view.
Select the light and move it away from the sphere.
Select the Center of Interest manipulator and place the COI in the middle of the grid, on top of the sphere.
Select the Rotate around COI or Rotate around COI (world) manipulator. Compare the rotation given by the green axis manipulator to the rotation by the world space rotation manipulator. The first rotation is uniform in the orthographic view, the latter isn’t.

Reproduced by support

Katana 2.5v1, 2.5v5 Windows 7

Katana 2.1v2, 2.1v3, 2.1v4, 2.1v5, 2.5v1, 2.5v4, 2.5v5 RHEL 6.4

Not reproduced in 2.1v1, 2.0v5, 2.0v1, 1.6v3

Expected behaviour

The position of the light and COI in the y axis hasn’t been manipulated, so the rotation by the world space rotation manipulator should be the same as the one by the axis manipulator.

Actual behaviour

It isn’t.

We're sorry to hear that

Please tell us why