Stereoscopic Viewing
Using Stereo
Using Sharp Auto-stereoscopic Screens

The stereoscopic plug-in enables stereo viewing using anaglyph glasses or auto-stereoscopic screens.

Note that when using the stereo mode two images, one for each eye, need to be rendered resulting in a slower display. This will be most noticeable in larger projects. Occasionally left and right views of point cloud data can render out-of-sync. To correct this simply update the view using the R keyboard shortcut.

Medical considerations
Some individuals may find it difficult or impossible to experience stereoscopic effects using these techniques for medical reasons.

Stereo viewing can cause eye strain if practiced for extended periods of time. Some viewing technologies cause more eye strain than others. If you are experiencing eye strain give your eyes a break.

Using Stereo
To switch into stereo mode use the F7 keyboard shortcut or click on the 3D icon in the View toolbar. If the view is not displayed as expected check the Stereo Mode and Depth settings.

The stereoscopic options are accessed in the General | Stereo tab of the Settings Dialog. The following options are available:
Enabled
Enables / Disables the Stereo mode.
Mode
Ses the stereo display mode. The following modes are currently available:
Interlaced Display
Use this mode for Sharp Auto-stereoscopic displays. Other displays may function correctly but have not been tested. If you use a Sharp screen please see the note about auto-switching in the next section.
Anaglyph
This mode supports Anaglyph glasses. These are typically low-cost glasses with Red-Blue or Red-Cyan lenses. If you are having trouble locating a supplier for these glasses contact support@pointools.com for a list of suppliers.

Note that areas of colour in the scene that are close to the colour of either lens may cause a loss of the stereo effect when using this mode.
Quad Buffered Stereo
This mode requires support for quad-buffering in your graphics card. You may also need to enable this in your graphics driver. Using this mode any Quad-Buffered OpenGL based device can be used to view in stereo. This includes most shutter glasses and some stereoscopic displays.
Depth Control
Controls placement of the Zero Disparity Plane (ZDP). This is the plane at which objects appear to neither in front nor behind the screen plane. Setting the ZDP determines how out-of-screen or into-screen the stereo effect appears. Typically excessive out-of-screen effects place more strain on the eyes and are harder to experience clearly than intoscreen effects with a balance of the two providing the best effect. The following depth control settings are available:
Depth Target
Uses a user placed target to place the ZDP. Set this in the viewport as you would set the view target but with the Shift key held ie. Use Shift+X whilst hovering over the point you what to place the plane or use the Set Target tool.
View Target
Places the ZDP at the view target. This is the default mode.
Behind Screen Plane
Places the ZDP in-front of all the objects in view causing everything to appear behind the screen.
50% behind 50% in front
Places the ZDP in the middle of the objects within the view frustum. This may not give the expected results if there are objects in the far distance.
70% behind 30% in front
Places the ZDP in-front of all the objects in view causing everything to appear behind the screen.
Depth Amount
Controls the amount of the depth effect. Adjust this value if the ZDP is set correctly (see above) but the stereo effect is too weak or too strong.
Swap left / right
Swaps the left and right cameras. Give this a try if the stereo effect does not seem correct. Some viewing systems may require this swap.


Using Sharp Auto-stereoscopic Screens
Auto-switching
The 3d auto-switching mechanism within Pointools has been temporarily disabled in release 1.52 due to some users experiencing a crash as the Sharp library initialises. We will try to resolve this in future releases.

For this reason you need to select 3D viewing mode in Pointools and switch on the 3D interlaced mode on your screen or laptop to view in stereo.