Boris FX Boris Calligraphy Vresion 2.0 Guia do Utilizador Página 179

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Working with Masks
179
Upstream and Downstream Masks
You can apply a mask as an upstream or downstream mask. These terms refer to when the
mask is processed in relation to the shape’s transformations.
About Upstream Masks
When you apply an upstream mask to a shape’s Face track, it becomes part of that face’s
media and is processed before shape transformations occur. In the following example, the
mask is applied first, then the masked face is curved into a cylinder.
When the mask is in the upstream position, it is treated as part of the track’s media.
Therefore, when you move the 3D Plane track, the mask moves with it.
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You cannot create upstream masks for any composition that uses the 3D Line Art shape as it
does not have a Mask track nested in the Face track.
About Downstream Masks
When you apply a downstream mask to the shape track itself and process after the shape
transformations occurs. In the following example, the face is curved into a cylinder first,
then the output is masked by the mask track.
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