Isadora Manual v1.3 - TroikaTronix

indicates a Scene in the Scene List by its position, where 1 is the first scene in
the list, two is the second scene, etc.
When a valid scene has been specified in this property, its name will appear
after the number.
• mode: Determines how the number in the scene property is interpreted. When
this property is set to relative the scene to be activated is relative to the
position of the current scene in the Scene List. When this property is set to
absolute the Scene to be activated is based on its position in the Scene List.
See scene property above for more information.
• fade: (V1.1) Specifies a fade time, over which the video and audio in the
newly activated scene will be faded in. (Note: The visual aspect of the fade in
will only work if Hardware Accelerated Rendering is turned on in the Video
tab of the Preferences.) The visual result of the fade in depends on a number
of factors: what video is being rendered in the current scene, the setting of the
blend and layer inputs in the Projector actors that become active, etc. See the
section “Compositing with the Projector” on Page 137 for more information
on taking advantage of multiple projectors.
Add Alpha Channel (v1.1)
Embeds an alpha channel into a video stream, which can be used by the
Projector actor when rendering the video to a Stage.
By embedding an alpha channel into a video stream, you can control the
transparency of each pixel as it is rendered to the stage.
When the Projector renders to the stage, it uses the embedded alpha mask
information to determine the transparency of the video stream being rendered.
Where the mask is white you will see the original video stream, where the mask is
black you will see the anything that has been rendered to the stage previously (i.e.
in a lower layer). When the brightness of the mask is a shade of gray you will see a
mix of the original video stream and previously rendered images – how much of the
background you will see is based on the mask’s brightness. When the mask is light,
you will see more of the foreground; where it is dark, you will see more of the
background. Below are examples foreground, background, and mask image, and the
result of combining them through the alpha mask
See the section “Compositing with the Projector” on Page 137 for more information
on taking advantage of these features.
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