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Horizon is setup by default to utilize a Gradient for its spherical reference, but can be switched to an Image Map referenced elsewhere within your composition.
If you're going to use an image map instead of a gradient, skip this section and proceed to the Image Map section below. If you're looking to use a gradient, this section contains controls on up to eight colors, and works in two different modes:
The Gradient settings above are only activate as long as Image Map is not selected below.
When a layer is selected using the Layer popup menu under the Image Map controls, the referenced layer is used instead of the built-in gradient.
Note that when a flat 2D image is mapped onto a s
pherical shape, distortion will naturally
occur, that is unless the image has been specially created or adapted for use with a 3D sphere, such as a spherical map. A spherical map is a 2D image that has been pre-distorted so that it will look correct when it's mapped onto a 3D sphere (see right).
There are two main benefits to using special spherical maps:
You can find a number of vendors around the internet that sell spherical maps or equirectilinear maps. You can also use panoramic images like those captured on a mobile device, or equirectangular/longitude-latitude maps.
Regular photos can also be used, such as stitched panoramas and matte paintings (or movies) as Image Maps. You'll need to set the Coverage H and V to desired values, and set the Straighten control to 100 in the Orientation and Distort group.
H Coverage describes in degrees (0-360) how much the image map covers the view horizontally. A value of 360 means that the left and right sides of the image will meet on the far side of the sphere, and will create more horizontal distortion. For an animation using a non-spherical map where the camera does not move a great deal, you may achieve better results by limiting the horizontal coverage to create less stretching.
V Coverage describes in degrees (0-180) how much the image map covers the view vertically. A value of 180 means that the top and bottom of the image will touch the poles, creating more vertical distortion in a non-spherical map.
Sampling: Your 2D image is mapped to a 3D surface, however there is not a one-to-one correspondence between each pixel and each coordinate on the sphere on account the image is stretched to fit the spherical surface. Sampling compensates for this lack of perfect correspondence and interpolates the right pixel value at each coordinate.
There are two sampling methods available in Horizon. Nearest Neighbor sampling is fast, because it picks the closest pixel value to the coordinate, but can result in a pixelated effect. The default setting of Bi-Linear sampling averages pixels around the coordinate, which is slower but produces better quality.
X, Y, and Z Rotation rotates the gradient or image map relative to the camera in the scene. Rotating in X will move the gradient or image up and down relative to the camera view. Rotating in Y will move the sphere around the camera; left to right for positive values, or right to left for negative values. Rotating in Z will tilt horizon line clockwise or counter-clockwise relative to the camera.
In most cases, you should leave these values at their defaults and use the composition's camera to animate the position relative to the background. If you need to move the position of a map, or you want create motion blur in front of the camera, then you might animate or change these values.
Straighten makes all lines straight in the Gradient/Lines mode when the value is set to 100. This control is most useful with image maps that are not in the spherical coordinates format (i.e., regular photos) so that you can undistort the projection of the image onto the sphere.
Scatter introduces a subtle scatter to both Gradient modes and image maps. Increasing this value to between 10 and 50 can be useful for in reducing banding artifacts in the subtle gradients created by the plug-in (Note: This type of banding effect is usually only noticeable with subsampled codecs like DV or HDV compression).
By default, Horizon uses the After Effects Comp Settings for Motion Blur.
To natively adjust the amount of motion blur, set the shutter angle, and phase in the Composition, head to Composition > Composition Settings >Advanced settings within After Effects.
Motion Blur can be disabled by selecting Off in the Motion Blur pop-up. This overrides the layer Motion Blur switch, so that if the layer's motion blur switch is on and the Motion Blur pop-up is set to off, then no motion blur will be rendered by the plug-in.