Chapter 11, 2D Compositing
| Multi-stream Compositing | |
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Chapter 11, 2D Compositing |
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Supported Stereo Output Graphics Hardware
Viewing stereo image pairs in Toxik is supported through an anaglyph display mode in the player, and by quad-buffered, 3D DLP, and left/right segmented frame plug-in video preview devices.
If you do not have stereo footage available, you can use the Reaction tool to create new footage by rendering a scene using a stereo camera rig--see Setting up a Stereo Camera Rig.
An anaglyph is a stereoscopic motion or still picture in which the right component of a composite image usually red in color is superposed on the left component in a contrasting color to produce a three-dimensional effect when viewed through correspondingly colored filters in the form of glasses. Anaglyph mode is applied after the display modifier. For example, if the display modifier performs gamma encoding, or tone mapping, the result is encoded for stereo display using an anaglyph after the gamma encoding or tone mapping.
Swipe south in a Player view and select the Streams tab.
Select Anaglyph from the Stereo Mode menu.
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From the Tools tab, select Stereo Streams from the Streams folder and drag it to the Schematic view.
Connect the stereo image pair left image to the left input of the Stereo Streams node and the right image to the right input of the Stereo Streams node.
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The stereo image pair is displayed in anaglyph mode in the player. You can view the image with inexpensive tinted glasses.
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Toxik 2009 supports special-purpose stereo viewing hardware, such as quad-buffered stereo monitors, or 3D DLP (TM) monitors. These stereo viewing devices are supported through Toxik video preview devices. You must select a video preview device that matches your stereo viewing hardware from the Video Preview device list in the User Preferences window. The default video preview device is None.
| Select: | To: |
| None | keep the default setting. Use None when you do not want a video preview device to be active. |
| Mono | view a video preview device that is just a window that shows one stream. You can put the window on another monitor if you have one. You can then view the contents of a player in a window on a second monitor. If you only have a single monitor, use Alt + Tab to view it. |
| DLP-3D Preview | view stereo pairs using DLP -3D monitors that support active shutter glasses--seeActive Shutter Glasses. |
| Segmented Frame Preview | view stereo pairs using circular polarization monitors with passive polarizing glasses--see Polarizing Glasses. |
| Quad-buffer | view stereo pairs with polarizing glasses using monitors based on linear polarization such--see Polarizing Glasses. |
Note: Quad-buffer will only appear in the Device list if you have a second graphics card to output the left and right streams.
Select the Video Preview device from the Device list from the User Preferences tab. If your video preview device is None, a Stereo video preview device will show nothing.If you switch to a stereo video preview device and you don't have a stereo pair, the stereo video preview device will show the same image in the left and right eyes.
 "Show full-size image")
Change the stereo mode to Segmented Frame Preview
Click in a Player view to make it current. The stereo pair is displayed.
Select a node in the dependency graph and change its parameters. Changes are made in the 3D scene both in the Player and in the video previewing device.
The following section describes some of the multiple display configurations possible on a Toxik workstation.
Toxik supports systems with standard graphics cards with DVI outputs.
Single graphics card, single DVI output--This configuration implies that stereo will be shown in the Toxik UI. Therefore, stereo display is restricted to anaglyph in the Player view.
Single graphics card, dual DVI output--A typical configuration would be one DVI output to drive the Toxik UI, and another to drive a single-input stereo display as a Toxik stereo video preview device.
Dual DVI output plus single DVI output graphics cards--The single DVI output card drives the Toxik UI, and the dual output card drives a dual DVI input stereo display as a stereo video preview device.
Dual dual DVI output graphics cards--As per the Dual DVI output plus single DVI output graphics cards descriptions above.
The following section describes both the viewing glasses and type of stereoscopic display monitors used with the glasses that are supported by Toxik.
Note: If your stereo video preview device only support 8 bits per color component, consider using a player view display modifier that can provide 8 bit output. Examples include the 1D LUT, 3D LUT, and Convert Depth tools.
Passive polarizing glasses are worn by the viewer. The display device shows left and right images simultaneously. Devices that use this technology include projectors and monitors. Examples of these devices are:
Circular polarization--Segmented Frame Preview mode monitors that use circular polarization. Its disadvantage is half vertical resolution in 3D (1920x600).
Linear polarization--Quad-buffered stereo mode displays use two monitors and linear polarization to create a full-resolution stereo image. In such systems, the observer head orientation is important to avoid ghosting artifacts.
The viewer wears LCD glasses that open the left or the right eye in synchronization with left and right images shown by the display device. The synchronization signal is broadcast by an emitter to the LCD glasses. Devices that use this technology include projectors and monitors. Examples of these devices are:
DLP monitors-- DLP monitors that support active shutter glasses. The left and right images are shown at double update rate (120 Hz), using a checkerboard pattern. Their disadvantage is half horizontal resolution.
Anaglyph--Left and right images are tinted red and cyan, and viewed using inexpensive tinted glasses. An important disadvantage is poor color reproduction.
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