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- import assert from 'node:assert/strict'
- import { readFile } from 'node:fs/promises'
- import { enuToGltf, instanceGltf } from '../../../src/modules/cockpit/services/pipeInstanceGltf.js'
- import { Matrix4, Matrix3, Cartesian3 } from 'cesium'
- // Independent literal: installed Cesium default correction maps glTF [x,y,z] -> ENU [z,x,y].
- const correction = Matrix4.fromRotationTranslation(Matrix3.fromArray([0,1,0,0,0,1,1,0,0]))
- const converted = new Cartesian3(...enuToGltf([11,23,37]))
- assert.deepEqual(Matrix4.multiplyByPoint(correction, converted, new Cartesian3()), new Cartesian3(11,23,37))
- const template = JSON.parse(await readFile(new URL('../../../public/cockpit/models/pipes/spline.gltf', import.meta.url)))
- const doc = instanceGltf(template, [
- { translation: [0,0,0], rotation: [0,0,0,1], scale: [.4,.4,10] },
- { translation: [1,2,3], rotation: [0,0,0,1], scale: [.4,.4,20] },
- ])
- assert.equal(doc.meshes.length, 1)
- assert.equal(doc.meshes[0].primitives.length, 1)
- assert.equal(doc.buffers[0].uri, template.buffers[0].uri, 'shared template geometry not copied per instance')
- const attrs = doc.nodes[0].extensions.EXT_mesh_gpu_instancing.attributes
- assert.equal(doc.accessors[attrs.TRANSLATION].count, 2)
- assert.equal(doc.accessors[attrs.SCALE].count, 2)
- assert.ok(doc.extensionsRequired.includes('EXT_mesh_gpu_instancing'))
- assert.equal(template.nodes[0].extensions, undefined, 'shared template remains immutable')
- const data = Buffer.from(doc.buffers[1].uri.split(',')[1], 'base64')
- assert.equal(data.readFloatLE(12), 1)
- assert.equal(data.readFloatLE(20), 3)
- assert.equal(data.readFloatLE(80-4), 20)
- console.log('PASS two GPU instances reuse one immutable mesh and preserve literal TRS')
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