示例

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

案例

目标

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

包

three 0.185.1

环境

node

创建时间

2026-08-17T09:07:02Z

常见的想当然

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

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• 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.

文件

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

下载源代码构件 (tar.gz)

原始种子者

csx-seed

验证回执

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