facett-map3d-flight/.nornir/assets/cdlod-terrain.svg
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<text x="20" y="30" fill="#e6edf3" font-size="15" font-weight="bold">facett-map3d-flight · CDLOD terrain quadtree (roadmap §6)</text>
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<!-- selection pipeline -->
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<text x="95" y="92">camera WorldPos</text><text x="95" y="110" fill="#8fb3c0">f64 ground pos</text>
<text x="300" y="92">Cdlod::select</text><text x="300" y="110" fill="#8fb3c0">quadtree · by distance</text>
<text x="510" y="92">SelectedNode[]</text><text x="510" y="110" fill="#8fb3c0">region · level · morph</text>
<text x="715" y="92">build_terrain_mesh</text><text x="715" y="110" fill="#8fb3c0">drape (REUSED)</text>
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<!-- CDLOD rules -->
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<text x="402" y="182" fill="#f2b84b" text-anchor="middle" font-weight="bold">the two invariants (crack-free)</text>
<text x="402" y="200" fill="#e6edf3" text-anchor="middle">range(level) = leaf_range · ratio^level</text>
<text x="402" y="216" fill="#8fb3c0" text-anchor="middle">adjacent nodes differ by ≤1 level · areas tile exactly</text>
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<!-- morph -->
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<text x="715" y="182" fill="#8fd18f" text-anchor="middle" font-weight="bold">morph_factor</text>
<text x="715" y="200" fill="#e6edf3" text-anchor="middle">0 near → 1 at edge</text>
<text x="715" y="216" fill="#8fb3c0" text-anchor="middle">no LOD popping</text>
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<!-- quadtree picture -->
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<text x="150" y="300" fill="#8fb3c0" font-size="11">camera (●) near a corner → that</text>
<text x="150" y="316" fill="#8fb3c0" font-size="11">quadrant subdivides to the finest leaf;</text>
<text x="150" y="332" fill="#8fb3c0" font-size="11">far quadrants stay one coarse node.</text>
<!-- GPU seam -->
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<text x="612" y="291" fill="#c9a0ff" text-anchor="middle" font-weight="bold">GPU height-morph (cdlod_morph.wgsl) — adapter-guarded</text>
<text x="612" y="308" fill="#8fb3c0" text-anchor="middle">cs_morph readback == CPU morph_height oracle · self-skips w/ sentinel</text>
<text x="20" y="360" fill="#7f8b98" font-size="11"></text>
<text x="150" y="366" fill="#7f8b98" font-size="10">CPU selection math is RED-when-broken tested GPU-less; the 21-pass pipeline is untouched (L2 additive).</text>
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