シューティングゲーム改: シーン再構築へのオクルージョンの追加 #1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| // | ||
| // MeshResourceExtension.swift | ||
| // Chapter8 | ||
| // | ||
| // Created by 鷲尾友人 on 2024/07/06. | ||
| // | ||
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| import RealityKit | ||
| import ARKit | ||
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| // 下記サイトを参考に作成。 | ||
| // https://forums.developer.apple.com/forums/thread/749759 | ||
| // https://zenn.dev/shu223/articles/visionos_scenemesh | ||
| // https://github.com/XRealityZone/what-vision-os-can-do/blob/main/WhatVisionOSCanDo/Extension/GeometrySource.swift | ||
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| extension MeshResource.Contents { | ||
| init(geom: MeshAnchor.Geometry) { | ||
| self.init() | ||
| self.instances = [MeshResource.Instance(id: "main", model: "model")] | ||
| var part = MeshResource.Part(id: "part", materialIndex: 0) | ||
| part.positions = MeshBuffer(geom.vertices.asSIMD3(ofType: Float.self)) | ||
| part.normals = MeshBuffer(geom.normals.asSIMD3(ofType: Float.self)) | ||
| part.triangleIndices = | ||
| MeshBuffer(geom.faces.asArray(ofType: UInt32.self)) | ||
| self.models = [MeshResource.Model(id: "model", parts: [part])] | ||
| } | ||
| } | ||
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| extension GeometrySource { | ||
| func asArray<T>(ofType: T.Type) -> [T] { | ||
| assert(MemoryLayout<T>.stride == stride) | ||
| return (0 ..< self.count).map { | ||
| buffer.contents().advanced(by: offset + stride * Int($0)) | ||
| .assumingMemoryBound(to: T.self).pointee | ||
| } | ||
| } | ||
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| func asSIMD3<T>(ofType: T.Type) -> [SIMD3<T>] { | ||
| return asArray(ofType: (T, T, T).self).map { .init($0.0, $0.1, $0.2) } | ||
| } | ||
| } | ||
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| extension GeometryElement { | ||
| func asArray<T>(ofType: T.Type) -> [T] { | ||
| assert(MemoryLayout<T>.stride == bytesPerIndex) | ||
| return (0 ..< self.count * self.primitive.indexCount).map { | ||
| buffer.contents().advanced(by: bytesPerIndex * Int($0)) | ||
| .assumingMemoryBound(to: T.self).pointee | ||
| } | ||
| } | ||
| } |
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ここが最も肝となる修正です。
SceneReconstructionProviderから得たMeshAnchorには現実の物体のかたちを表すメッシュ情報が格納されており、それをもとにShapeResourceとCollisionComponentを作成して衝突をシミュレートできるのは本誌で学んだ通りです。この修正ではさらに、このメッシュ情報を用いてMeshResourceを作成し、障害物を表すエンティティのかたち(ModelEntityのmesh引数)に設定します。またエンティティのマテリアルをOcclusionMaterial(背後のオブジェクトを隠す不可視のマテリアル)に設定します。MeshAnchorからMeshResourceへの変換は、ShapeResourceとは異なり簡単な手段がないので(visionOS 1.2時点)、MeshResource.swiftに自前の変換関数を用意して実現しています。