The final rendered image can be stretched or squashed horizontally, relative to the pixels your effect processes. But effects that use absolute pixel measurements or geometry must take a deeper look at the relationship between the input buffer and the final rendered image.ĭon’t Assume Pixels Are Square, Or 1-To-1 ¶įirst, it is not necessarily a square coordinate system, due to both pixel aspect ratio and non-uniform downsample factor. This provides an implicit “pixel coordinate system.” This coordinate system is handy and easy to understand. Point parameters are given to the effect scaled for downsample factor and pixel aspect ratio they are in the coordinate system of the input buffer. Simple effects needn’t do any work to match up point parameters to the actual pixels in the output. Even different layer parameters can have different pixel aspect ratios! Doing so isn’t difficult once you understand the concepts involved. Custom ECW UI Over A Standard Data TypeĮffects must respond correctly to footage with non-square pixels, and non-uniform downsampling factors.Changing Parameter Orders, the Nice Way.Don’t Assume Pixels Are Square, Or 1-To-1.Accessing the After Effects Function Suites.Compatibility Across Multiple Versions?.
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