Planar Region
Like the 3D region, this determines a region that could be used as a source or as a bounce plane, but instead of a 3D region it's a 2D plane. Connect a peg to the right inport to adjust the position of the plane.
Layer Properties
Use the Planar Region's Layer Properties panel to adjust the effect's parameters.
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Shape Type: This is where you can define the shape of the plane. The parameters that you can adjust below will be greyed out depending on which shape type you choose. Each shape can be adjusted from the Camera view using the Transform Tool by selecting the Planar Region and then selecting View > Show > Control. 
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Rectangle: Adjust the width and height on a rectangle. 
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Disc: Adjust the point (the centre) of the disk. You may also adjust values for minimum and maximum radius. A minimum radius of 0 will simply be a circle. 
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Triangle: Adjust the three points of the triangle independently. 
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Line: Adjust two points on a line. 
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Point: Adjust the position of one single point. 
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Image: If you choose to use the Image option, then you should make use of the left inport of the PlanarRegion to connect a drawing layer that can be used as a mask. 
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Width: Adjust the width of a rectangular region. 
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Height: Adjust the height of a rectangular region. 
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Minimum: Adjust the minimum radius on a disc region. 
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Maximum: Adjust the maximum radius on a disc region. 
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X: Adjust the X position of Point 1. Point 1 could refer to the point on a triangle, a line, or a point. 
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Y: Adjust the Y position of Point 1. 
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X: Adjust the X position of Point 2. Point 2 could refer to the point on a triangle or a line. 
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Y: Adjust the Y position of Point 2. 
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X: Adjust the X position of Point 3. Point 3 refers to a point on a triangle. 
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Y: Adjust the Y position of Point 3. 
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