SegmentTransform

BMD21 describes Segment Transform as dividing the frame into square-shaped segments with angle and scale distortion applied to each. The output remains an image; the node does not create editable 3D tiles, shape objects or a physical shard simulation.

Center and Segment Size define the partition. Local Angle and Scale are in the Transform group below. The two Lock checkboxes are independent: Lock Segment Size links partition dimensions; Lock Scale links transformation scale.

Start with an asymmetric detailed source and the supplied PNG values: Center 0.5/0.5, Segment Size X 0.1, both Locks enabled and Scale X 1. A small nonzero Angle reveals segment behavior; a uniform fill is a poor warp test.

The Render PNG shows Warp 1, Under-Sample Resolution 1, Filtering Area and Edges Black. These states are used as references. The short BMD section does not give Warp or internal sampling equations, so linearity, units and speed are not presented as verified properties.

The outer source-image boundary and internal segment boundaries require separate checks. Wrap reuses the opposite edge; Duplicate extends boundary pixels. Neither choice automatically proves that all cells are seamless or that black regions have zero alpha.

For local application, the lesson uses a regular Merge: original in Background, completed warp in Foreground, and Ellipse in Merge EffectMask. The mask limits the visible result and does not build a separate partition inside its white region.

After choosing partition size and local transformation, inspect the result at 100% and after the required reduction. Native Resolve rendering, exact pixels, alpha and detailed Render algorithms remain unverified.