Animation of composite nodes, where the circle moves from left to right at a half circle disappears at frame 20.
Ton Roosendaal Thanks for your patience with others.
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The compositor currently works without knowledge of a global size or "canvas" to work on, instead each node accepts any resolution as input.
What happens in your composite is that you create a circle texture (uses render size), then scale it smaller, then translate it, and then put it in the ramp node.
This ramp node delivers the same sized buffer as it gets, and applies the translation itself. That results in cutting.
If you put the colorRamp before the translate or before the scale, things go fine. It then applies translation only in the alpha over node.