Adds <MeshInstance/> component

[marklundin]

This PR introduces a declarative <MeshInstance/> component providing a React-level abstraction over the engines MeshInstance. It mirrors the underlying engine behaviour while fitting into the existing <Entity> / <Render>hierarchy.

This will be necessary to support a better API for loading assets.

Features

• Lifecycle management – Creates and destroys a MeshInstance automatically when mounted or unmounted.
• Parent integration – Attaches to the nearest component’s meshInstances array.
• Morph targets – Supports morph weights via setWeight(index, value).
• Skinning – Allows passing an existing pc.SkinInstance.
• Instancing – Supports both:
  • pre-created VertexBuffer
  • raw Float32Array matrix data (with auto-created buffer)
• Automatically cleans up GPU buffers created internally.
• Validation – Uses the shared schema system for type-safe prop validation.
• Test
• Examples

Example

<Entity>
 <Render>
   <MeshInstance mesh={mesh} material={material} />
 </Render>
</Entity>

with instancing

const matrices = new Float32Array(count * 16);

<Entity>
  <Render>
    <MeshInstance mesh={mesh} material={material} instancing={{ matrices, count }} />
  </Render>
</Entity>

[changeset-bot]

🦋 Changeset detected

Latest commit: 5c4072e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@playcanvas/react	Minor
@playcanvas/blocks	Patch

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