User`s guide

Working with Lights and Shadows
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5. Select the Square Style option if you want the corner of the cropped image to be square.
Otherwise, the corners are rounded.
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In OpenGL mode, you cannot see non-accelerated objects when you use the on-screen
interactors. For details, see “The OpenGL Interactors” on page 52.
For detailed information on the Crop tab parameters, see “Crop Parameters (for 3D
Primitives)” on page 361.
Masking the Shape
The Mask tab functions similarly to the Crop tab except that it masks the Shape track after
shape transformations are applied. Cropping takes place before transformations are applied.
The size and location of the mask remain the same regardless of the position of the object.
The mask does not tumble, spin, or rotate along with the shape.
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In OpenGL mode, you cannot see non-accelerated objects when you use the on-screen
interactors. For details, see “The OpenGL Interactors” on page 52.
The Mask tab controls create a downstream mask, which is applied to the Shape track and is
processed after the shape transformations.
You can also use the Mask tracks in the timeline to create upstream or downstream masks of
different shapes. You can also animate the mask shape which is useful for rotoscoping. For
more information on masks, see “Applying a Mask to a Track” on page 180.
The Spline Primitive media type allows you to create spline objects in basic shapes,
including rectangles, circles, stars, arrows, hearts, and medallions. You can drag these
shapes into Mask tracks to create masks or transitions. For more information, see “Working
with the Spline Primitive Media Type” on page 546.
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When you work with filters, you can use the PixelChooser to quickly create masks based on
a region or a channel. For more information on PixelChooser, see “Using the
PixelChooser” on page 189.
Cropped Cropped & masked