Adobe 12040118 - After Effects Standard Tutorial page 415

Reverse Lens Distortion. Selecting Reverse Lens Distortion enables the Resize control.
FOV Orientation The axis on which the Field Of View value is based. This setting is useful when matching computer-generated elements to the
rendered view angle.
View Center Specifies an alternate center point of view. This setting is useful when using custom lenses that aren't centered. However, in most
cases, this control should be left untouched.
Optimal Pixels Maintains as much pixel information as possible through the distortion. When selected, FOV values are no longer reversible.
Resize Resizes the layer when the applied distortion stretches the layer beyond its boundaries. To use this control, first select Reverse Lens
Distortion, and then choose an option. Off doesn't resize the layer. Max 2X resizes the layer to a maximum of twice the original width and height.
Max 4X resizes the layer to a maximum of four times the original width and height. Unlimited resizes the layer as far as it is stretched. This option
may require a large amount of memory.
Add and match lens distortion with Optics Compensation
To match FOV values, layers must be the same size. However, if you select Resize, you can apply Optics Compensation again and reverse the
distortion using the same value (reversed). You can then apply another effect between the two instances of Optics Compensation.
If you resize a layer using Optics Compensation and then precompose it into a larger composition, you cannot reverse the distortion using the
same value until you enlarge the precomposed layer to accommodate the expanded layer.
1. Select the layer with the distortion, and choose Effect > Distort > Optics Compensation.
2. In the Effect Controls panel, adjust the FOV until a distorted edge or line appears straight. Note the FOV value.
3. Select the computer graphic layer you want to distort, and apply Optics Compensation to it using the FOV value from step 2.
4. Select Reverse Lens Distortion.
5. Remove Optics Compensation from the footage layer.
Polar Coordinates effect
The Polar Coordinates effect distorts a layer by transposing each pixel in the (x,y) coordinate system of the layer to the corresponding position in
the polar coordinate system, or the reverse. This effect produces unusual and surprising distortions that can vary greatly depending on the image
and the controls you select. The standard coordinate system specifies points by measuring the horizontal distance (x axis) and the vertical
distance (y axis) from the origin. Each point is specified as (x,y). The polar coordinate system specifies points by measuring the length of a radius
from the origin (r) and its angle from the x axis ( ). Each point is specified as (r, ).
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Original (upper-left), and with variations of Polar Coordinates applied (lower-left and right)
Stu Maschwitz provides an example project on his
Sun and then uses the Polar Coordinates effect to wrap the line of noise around into a circle.
Interpolation Specifies the amount of distortion. At 0%, no distortion occurs.
Type of Conversion The conversion process to use:
Rect To Polar Moves pixels by using (x,y) coordinates from each pixel as (r, ) coordinates. For example, an (x,y) coordinate of (2,3)
becomes a polar coordinate with a radius of 2 and a degree of 3. Horizontal lines distort into circles, and vertical lines into radial lines.
Polar To Rect Moves pixels by using the (r, ) coordinates from each pixel as the (x,y) coordinates. For example, polar coordinates of
radius 10 and 45° become (x,y) coordinates of (10,45).
Reshape effect
The Reshape effect transforms one shape into another shape on the same layer, dragging the underlying image with it. The image is distorted to
fit the shape of the new area. You create or import up to three masks to define the area you want to distort: the source mask, the destination
ProLost blog that uses the Fractal Noise effect and Colorama effect to create the corona of the
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