If different projections are visible simultaneously in separate canvas windows, then synchro cursors show the same cursor position in all projections. Syncro cursors are activated by clicking on the SC tab of the interaction control in the Control Window.
Now simply click in a canvas pad with the left mouse key and, while keeping the key pressed, move around in the canvas pad to see the synchro cursor follow the cursor position. The synchro cursors in the other canvas pads follow the leading synchro cursor. The synchro cursor in any canvas pad may be used as leading cursor.
The concept is simple: a 3D point defined by (φ,η,ρ) in one projection is shown in all other projections by conversion to the appropriate coordinates. This is rigorously applied if the pointer is moved in the φ/η projection. Otherwise only those coordinates are shown, which are modified in the projection according to the table below:
Table 4.6. Coordinates affected by synchro cursors
Pointer | Displayed | |||||
---|---|---|---|---|---|---|
moved in | ρ/Z (5.4 ρ/Z Projection) | Y/X (5.1 Y/X Projection) | φ/ρ (5.5 φ/ρ Projection) | φ/Z (5.6 φ/Z Projection) | φ/η (5.2 φ/η Projection) | X'/Z (5.7 X'/Z Projection) |
ρ/Z (5.4 ρ/Z Projection) | ρ,Z,η | ρ | ρ | Z | η | Z |
Y/X (5.1 Y/X Projection) | ρ | φ,ρ | φ,ρ | φ | φ | |
φ/ρ (5.5 φ/ρ Projection) | ρ | φ,ρ | φ,ρ | φ | φ | |
φ/Z (5.6 φ/Z Projection) | Z | φ | φ | φ,Z | φ | Z |
φ/η (5.2 φ/η Projection) | Z,ρ * | φ,ρ* | φ,ρ* | φ,Z** | φ,η | ? |
X'/Z (5.7 X'/Z Projection) | Z | Z | Z |
* Current ρ is used.
** Current ρ is used to calculate Z.
Setting the splitting angle in ρ/Z
A special feature of the synchro cursors interaction is to set the angle φρZ of the ρ/Z (5.4 ρ/Z Projection) projection from any other projection which defines φ. This transfer of φ information is performed by keeping modifier key P pressed while the cursor is being moved in a φ defining projection. This is particularly useful when the φ defining projection is taken to be Y/X (5.1 Y/X Projection) as in this case all data in one Y/X hemisphere are shown on the upper half of the ρ/Z projection while all data in the other Y/X hemisphere are shown on the lower half of the ρ/Z projection.