Ampandheaust
9ca12c237e
Amp-Thread-ID: https://ampcode.com/threads/T-01a01ff8-b91f-724f-8952-f07c6b5042fd Co-authored-by: Heaust Azure <heaust.azure@gmail.com>
44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
# glTF import and picking
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## Import off-thread
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The shared importer worker fetches and parses glTF/GLB, then the response hydrates `Mesh` and `PBRMaterial` handles attached to your scene.
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```ts
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import { importGltf } from "@yawn/handles";
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const meshes = await importGltf(scene, "/models/sponza.glb");
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meshes[0].position.y = 0.5;
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```
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The importer handles triangle primitives, external/data buffers, standard vertex attributes, indices, node transforms, and metallic-roughness values. Application-specific extensions remain application policy.
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## Pick in the BVH worker
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```ts
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const picking = new Picking(scene);
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await picking.ready;
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canvas.addEventListener("click", async () => {
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const hits = await picking.pick([0, 0, 4], [0, 0, -1]);
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const nearest = hits[0];
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if (nearest) console.log(nearest.id, nearest.distance);
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});
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```
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The worker reads shared node positions and mesh bounds, updates its BVH when the shared frame counter changes, and returns **all** AABB hits sorted by distance. You can shortlist or run an exact test afterward.
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If row allocations relocated since `Picking` was created, refresh its shared descriptors:
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```ts
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await picking.refresh();
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```
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The playground below imports the repository's full LFS-backed `sponza.glb` in the importer worker, preserves its authored transforms, adds neutral warm lighting, places an arc camera in its coordinate system, and sends a real ray to the BVH worker. Click the preview to pick again.
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<Playground example="importing" />
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<script setup>
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import Playground from "../.vitepress/Playground.vue";
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</script>
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