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Cube Face Cross Atlas: Atlas cell reserves only one gutter edge or none · case 02

The returned physical layout descriptor disagrees with the declared buffer mapping at cell_size.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Six square cube faces occupy stipulated cells of a 4x3 atlas cross: [(2,1),(0,1),(1,0),(1,2),(1,1),(3,1)]. Every cell has a one-texel gutter and atlas rows end with a three-byte guard. Face sampling is storage addressing only. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
layout fixture 1	`{"address": 347, "allocation_end": 626, "atlas_height": 12, "atlas_width": 16, "cell_origin": [8, 4], "cell_size": 4, "face_cell": [2, 1], "face_row_end": 356, "pixel_position": [9, 6], "row_pitch": 51}`	`{"address": 488, "allocation_end": 959, "atlas_height": 15, "atlas_width": 20, "cell_origin": [10, 5], "cell_size": 5, "face_cell": [2, 1], "face_row_end": 497, "pixel_position": [11, 7], "row_pitch": 63}`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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