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-rw-r--r--docs/tomes/05-render.md9
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diff --git a/docs/tomes/05-render.md b/docs/tomes/05-render.md
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@@ -1063,6 +1063,15 @@ provenance while avoiding repeat format work for repeated components. The same
demonstrate an additional checkpoint advance from this cache; it must not be
reported as a measured startup improvement.
+`Assets` now has three ordered diagnostic sub-checkpoints: `AssetModels`
+(MSH and WEAR), `AssetMaterials` (MAT0) and `AssetTextures` (diffuse TEXM and
+lightmaps). The callback is observational: it neither changes the preparation
+order nor deduplicates requests. A fresh controlled 60-second canonical GOG
+`Autodemo.00` first-root probe reached `AssetModels` and did not reach
+`AssetMaterials`; its created process was terminated and no native frame was
+reported. This narrows the next investigation to model/WEAR preparation, but
+does not by itself attribute the delay to either decoder or I/O.
+
The same source-axis proof now applies to `TerrainWorld`: its `Land.msh` surface
height query and `Land.map` areal/grid lookup use XY ground coordinates, return
source Z height, and leave raycasts as full 3D intersections. The Part 1 and