Super Channels provide a generic tool to create and group transitions between various types of assets in Viz Artist. They are an abstraction mechanism to represent, access and apply transitions between the various types of media assets.
Within the Super Channel, you assign two media assets, A and B, to provide event based transitions between them. Internally, the Super Channel then utilizes the channel type required of the corresponding media asset to represent the underlying content.
Some of the benefits of using Super Channels are:
Replaces Transition Logic.
Eliminates the need to use special plugins to adjust image proportions.
Shows assets only when they are fully loaded.
Provides a notification as soon as assets are available.
Allows you to design your own transition to use to switch between elements.
Here, you find information on the following:
Super Channel and Subchannels
A Super Channel utilizes some generic settings and settings for A and B channel. The icon in the side panel shows a preview of the two Subchannels. To switch between the different properties you can use the tabs on the top or you can click the icons to switch:
Super Channel Settings
Sub Channel (A, B): Drag scenes, images, live feeds or clips to the Sub Channel icon. Click Viz One to load a clip from your configured Viz One system, or load a local clip by clicking the Browse for a clip button.
Active Sub Channel
Forces the Super Channel to switch between A and B.
Asset Type: Switches between DVE and Texture mode. DVE requires a videoboard with hardware compositor capabilities. You can override the default output resolution (Use Output Resolution) with a custom resolution if needed (useful in certain scenarios like videowalls setups or if the surface of the texture channel is needed in third party applications).
Directors: Sets the animation of the transition, from sub channel A to B, or from B to A. Disable
Autoto select an existing Director to run the transition with, orNoneto disable the transition.
Start Mode: Selects what triggers the Super Channel transition:
Manually: Sets user manual switching from sub channel A to B, or vice versa, by selecting the sub channel in Viz Artist or through external commands.
Assignment: Triggers transition when you assign a new asset to inactive sub channel.
Assignment / Cleared: Triggers transition asset assignment, or when you clear the sub channel.
Loaded: Triggers transition when an asset is loaded. This is useful for Super Channels that display images when image background loading is active in the Viz Engine configuration.
Loaded / Cleared: Triggers transition when an asset is loaded, or when you clear the sub channel.
Director finished: Triggers transition once a given director has finished execution.
Sync Object: Drag a Super Channel to the Sync objects area. Sync objects provide a way to synchronize execution of Super Channel transitions between multiple Super Channels. Sync objects monitor all linked Super Channels until all their inactive sub channels have been loaded. The sync object then calls
onAllChannelsArmedto trigger the transition for all Super Channels managed by the sync object. You can add as many Super Channels to a sync object as are required.Event: Allows you specify the Scene, the sender (Animation from Stage or from Super Channel) and the Event (on Started, on Stopped, onDirectorStarted, onDirectorStopped).
Mode: Selects the mode for using internal channels. This only affects hardware based channels (for example, Live1 or Clip1). In DVE mode, the internally used channel for a subchannel is used in DVE mode, all properties of the subchannel are copied to the DVE layer. In Texture mode, the internally used channel is used in texture mode and an ImageChannel is used to show the texture.
Sync Object Example: Add two Super Channels to the scene. Then set Start Mode of Super Channel 1 to Sync Object and drag Super Channel 2 into the list of linked channels. Notice how this links Super Channel 1 and Super Channel 2 to each other. The transition from the active to the inactive Sub Channel starts as soon as both inactive Sub Channels have fired onAssigned and onLoaded. Assign an image to sub channel B of both Super Channels to achieve this. You can do this manually in Viz Artist, or via external commands:
MAIN_SCENE*Super Channel*<CHANNEL_ID>*<A|B> SET IMAGE <UUID>
In case a sync object is active, but you do not want to change the assets on allsyncedSuper Channels, you still have to call the assign command on all Sub Channels. Otherwise, the sync object does not fire, and thus the transition does not trigger. However, re-assigning the already assigned Media Asset is completely free in terms of performance, as no internal reloading takes place. As such, this represents a viable option to trigger the requiredonAssignedevent.
Super Channel Transformation
This section is used to animate the whole Super Channel, including both sub channels. Super Channel animations are independent of the sub channel animations. This means that you can have a transition animation between multiple Super Channels, which is often required for content on Videowalls.
You can animate certain Super Channel properties, such as Position, Size, or Alpha, to define custom transitions between one or more Super Channels. A detailed description of the parameters can be found in the Media Asset Panel.
Note: Super Channels deal with rendering content assigned to the two sub channels, A and B, in the current main scene. Thus, they represent an intuitive and easy to use mechanism for transitioning between the sub-channels A and B.
Sub Channels
A Super Channel is composed of two Sub Channels, A and B.
You can animate certain Sub Channel properties, such as Position, Size, or Alpha, to define custom transitions between the two Sub Channels.
Transformation Settings
A detailed description of the parameters can be found in the Media Asset Panel.
Note: To utilize background loading in combination with Super Channels, enable it globally in Viz Engine. The dedicated SETBGL commands used with containers, <ObjectID>*TEXTURE*IMAGE SETBGL <UUID>, do not work with Super Channels.
Start Mode Settings
Here you can select how to trigger the Sub Channel animation. The Start Mode options are:
Manually: Sets user manual switching from subchannel A to B or vice versa by clicking the corresponding subchannel in Artist or through external commands.
Transition Start: Triggers on transition start.
Transition End: Triggers on transition end.
Loaded: Triggers transition once a newly assigned asset has been loaded. This is of special interest for Super Channels displaying images, with image background loading activated in the Viz Engine configuration.
Event: Allows you specify the Scene, the sender (Animation from Stage or from Super Channel) and the Event (on Started, on Stopped, onDirectorStarted, onDirectorStopped). An event is fully defined by its event name, the identifier/name of the sender, and its arguments. A new internal event system was introduced in Viz Engine 3.9. This allows certain objects to fire and listen to internal events. Amongst those objects are:
Super Channels or their sub channels
Stage
Scripts
For details, please see Super Channel Events.
Scene Settings
Scene Force Key: Allows you to force a full-screen key of your loaded scene, even there is no key function applied to it.
Keep Aspect: When using orthogonal camera projection, this flag ensures that the output is not going to be distorted if the main scene has a different aspect.
Image Settings
Image: Allows you to control the Zoom mode, Alpha value and the border color of a loaded Image.
Clip Settings
Provides control of a loaded clip.
Clip Channels Used
Subchannels use image/clip/live/gfx channels internally to display their contents. When a clip is selected for a subchannel, the first un-used clip channel is chosen by default to display the clip. However, if the subchannel property ASSIGNED_CLIPCHANNEL is set (using command SET), the subchannel is enforced to use this specifically assigned clip channel.
Also, the property RESERVED_CLIPCHANNELS of the scene saves a list of clip channels, which the subchannels of the scene should avoid. Clip channels can be added to (command ADD) or removed from (command REMOVE) the list. The whole list can also be set (command SET).
Assigning/Restricting Clip Channels (Command Line):
MAIN_SCENE*SUPERCHANNEL*1*A*ASSIGNED_CLIPCHANNEL SET Clip1MAIN_SCENE*SUPERCHANNEL*1*A*ASSIGNED_CLIPCHANNEL GET
MAIN_SCENE*RESERVED_CLIPCHANNELS ADD Clip1MAIN_SCENE*RESERVED_CLIPCHANNELS REMOVE Clip1MAIN_SCENE*RESERVED_CLIPCHANNELS SET Clip1 Clip1 Clip3MAIN_SCENE*RESERVED_CLIPCHANNELS GET
Viz script also has commands for the same functionality, as in the following examples:
Assigning/Restricting Clip Channels (Viz Script):
scene.getSuperchannel(0).Pending.AssignedClipChannel = "CLIP1"println(scene.getSuperchannel(0).Pending.AssignedClipChannel)
scene.AddReservedClipChannel("CLIP1")scene.RemoveReservedClipChannel("CLIP1")scene.SetReservedClipChannels("CLIP1 CLIP2 CLIP3")println(scene.GetReservedClipChannels())
Transition Shaders
How to create and work with Super Channel Transition Shaders is explained in chapter Viz Engine Shaders.
Super Channel Events
Event Example:
An event is fully defined by its Eventname, the identifier/name of the Sender and its Arguments.
Eventname: onDirectorFinished
Sender: #1004*STAGE
Arguments: director1
Query available/registered events using the following commands:EVENT_POOL*REGISTERED_OBJECTS GET EVENT_POOL*REGISTERED_EVENTS GET <$objectname>
ExampleEVENT_POOL*REGISTERED_EVENTS GET #427*STAGE
With Viz Engine 4.2, the behavior once a subchannel gets cleared has been changed:
Viz Engine versions before 4.2:
If B is the active subchannel and A gets cleared, it switches to A.
If B is the active subchannel and B gets cleared, nothing happens.
Viz Engine versions 4.2 and later:
If B is the active subchannel and A gets cleared, it switches to A.
If B is the active subchannel and B gets cleared, it switches to A.
Note: To obtain detailed information about status changes on the various Super Channels and subchannels enter command: EVENT_POOL*DEBUGGING SET 1. Additional status information related to the Super Channels and their Sub Channels can be found in the Viz Engine’s console output.
Enforced Background Loading
Similar to generic images in the scene tree, images for Super Channels can be loaded using background loading even if background loading is disabled in the config. To enforce background loading, use the following command when loading an image:
Viz Engine Commands
$(scene)*SUPERCHANNEL*$(id)*$(SUBCHANNEL) SETBGL IMAGE $(image_path_or_uuid_or_url)example:MAIN_SCENE*SUPERCHANNEL*2*A SETBGL IMAGE <31E74EAF-E4B1-254C-B50987E7DF19182F>Adaptive Scene Design Formats Support for Super Channels
Super Channels can be set to render a certain format using the command or Viz Artist:
#<sceneID>*SUPERCHANNEL*1*REQUESTED_FORMAT SET <name of format>Note: If the requested format is not supported by the Super Channel scene, then it falls back to the default format to render content.
Note: Formats support is possible if we are using a scene in SubChannel A or B.
See Also