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Which node inputs accept a value field, so an image can drive them per item.

A value field is a number that varies across space (see The halftone pipeline). Certain node inputs accept a field in place of a single number - when they do, the node samples the field once per item, so every shape in a list gets its own value based on its position.

One image, six outcomes - the same field wired into a different node in each panel. Every shape samples the field at its own position, so the effect swells toward the bright center and fades at the dark edges.

• Scale: factor per item (about each item's centroid). The canonical halftone driver.
• Offset: offset distance per item.
• Circle: radius per item.
• Rotate: angle (in degrees) per item.
• Rectangle: directed width per item.
• Place: the rotation and scale applied to each stamp, sampled at each target point.
• Style: the stroke width per object, sampled at each object's center - so line weight can follow an image's tone across a tiling (see Style).

If a numeric input accepts a field, wiring a field into it "just works" - the value becomes per-item instead of uniform. Wire a plain number instead and the input behaves normally (the same value everywhere).

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