This mask is parametered by a 2D segment that ranges from
pixels fully unselected
to
pixels fully selected
.
Note that similar and more evolved masks can be obtained by combining a
Layer mask
Turn any 2D generator into a mask
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with a
Linear Gradient
This generator creates a linear gradient (by default from black to white), from top to bottom
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.
The corresponding mask in 3D space is:
Linear
Using a line in space as mask
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.