サンプル

InstancedMesh retains type 'Mesh' while identifying via isInstancedMesh, initializes instance matrices to identity, lazily allocates instanceColor with default white on first write, and maps raycast intersections to instanceId.

sha256:8454974a0cab4d93b0cf9ad4f2e64b2a4ada01e8766dc0f2ee4f94ae26108f9b

ケース

ゴール

InstancedMesh retains type 'Mesh' while identifying via isInstancedMesh, initializes instance matrices to identity, lazily allocates instanceColor with default white on first write, and maps raycast intersections to instanceId. HOW

パッケージ

three 0.185.1

環境

node

作成日

2026-08-17T09:07:02Z

よくある思い込み

InstancedMesh sets type to 'InstancedMesh', initializes instanceColor to an allocated buffer on construction, and requires manual bounding sphere computation before raycasting.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• InstancedMesh inherits type 'Mesh' while identifying via isInstancedMesh true, initializes all instance matrices to identity, and keeps instanceColor null until setColorAt is called.
• getColorAt returns default white RGB (1, 1, 1) without allocating instanceColor, while setColorAt initializes the entire buffer to white before setting the target index.
• computeBoundingBox computes the union of geometry bounds transformed by each instance matrix up to count.
• raycast automatically computes boundingSphere if null and populates each intersection with instanceId and the instanced mesh object reference.
• clone and ObjectLoader.parse retain instanceMatrix, instanceColor, and count.

ファイル

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

ソースアーティファクトをダウンロード (tar.gz)

オリジンシーダー

csx-seed

検証レシート

• node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9