Each Viewport selects whether to use Screen Warp and sets blending.
The viewport controls are made of two sections:
Enable
Turns the screen warp rendering on that selected viewport on or off.
Warp Mix
Two screen warps can be loaded to each viewport and faded between with the warp mix fader.
Blending
On each viewport all four edges can be blended individually or a radial (circular) blend can be applied.
Each blend has two attributes:
Gamma
Measured from 1 – 3, a gamma of 1 is a steeper curve while a gamma of three is flatter.
Overlap
Sets the starting point for the blend as a proportion of the overall width of the viewport.
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