RealityKit – 获取 ModelEntity 大小为 SIMD3<Float>
RealityKit – Get ModelEntity Size as SIMD3<Float>
有没有办法知道 SIMD3 模型实体的大小?一次,我得到尺寸,我想将它传递给 CollisionComponent。
let box = ModelEntity(mesh: MeshResource.generateBox(size: 0.2),
materials: [SimpleMaterial(color: .green, isMetallic: true)])
box.position.y = 0.3
box.generateCollisionShapes(recursive: true)
box.physicsBody = PhysicsBodyComponent(massProperties: .default,
material: .default,
mode: .dynamic)
// I know I can use the following
box.collision = CollisionComponent(shapes: [.generateBox(size: [0.2,0.2,0.2])],
mode: .trigger,
filter: .sensor)
// but why not just pass the size of the box I created earlier.
box.collision = CollisionComponent(shapes: [PASS BOX SIZE HERE],
mode: .trigger,
filter: .sensor)
要计算基元的大小,请使用其 bounding box
的 max
和 min
值。
let box = ModelEntity(mesh: MeshResource.generateBox(width: 0.11,
height: 0.23,
depth: 0.45))
// "reverse engineering"
let width = (box.model?.mesh.bounds.max.x)! - (box.model?.mesh.bounds.min.x)!
let height = (box.model?.mesh.bounds.max.y)! - (box.model?.mesh.bounds.min.y)!
let depth = (box.model?.mesh.bounds.max.z)! - (box.model?.mesh.bounds.min.z)!
let boxSize: SIMD3<Float> = [width, height, depth]
print(boxSize)
// Result:
// SIMD3<Float>(0.11, 0.23, 0.45)
要计算 .usdz
模型任何部分的边界框大小,请使用以下方法:
let car = try! ModelEntity.load(named: "car.usdz")
let carBody = car.children[0]..........children[0] as! ModelEntity
print((carBody.model?.mesh.bounds)!)
有没有办法知道 SIMD3 模型实体的大小?一次,我得到尺寸,我想将它传递给 CollisionComponent。
let box = ModelEntity(mesh: MeshResource.generateBox(size: 0.2),
materials: [SimpleMaterial(color: .green, isMetallic: true)])
box.position.y = 0.3
box.generateCollisionShapes(recursive: true)
box.physicsBody = PhysicsBodyComponent(massProperties: .default,
material: .default,
mode: .dynamic)
// I know I can use the following
box.collision = CollisionComponent(shapes: [.generateBox(size: [0.2,0.2,0.2])],
mode: .trigger,
filter: .sensor)
// but why not just pass the size of the box I created earlier.
box.collision = CollisionComponent(shapes: [PASS BOX SIZE HERE],
mode: .trigger,
filter: .sensor)
要计算基元的大小,请使用其 bounding box
的 max
和 min
值。
let box = ModelEntity(mesh: MeshResource.generateBox(width: 0.11,
height: 0.23,
depth: 0.45))
// "reverse engineering"
let width = (box.model?.mesh.bounds.max.x)! - (box.model?.mesh.bounds.min.x)!
let height = (box.model?.mesh.bounds.max.y)! - (box.model?.mesh.bounds.min.y)!
let depth = (box.model?.mesh.bounds.max.z)! - (box.model?.mesh.bounds.min.z)!
let boxSize: SIMD3<Float> = [width, height, depth]
print(boxSize)
// Result:
// SIMD3<Float>(0.11, 0.23, 0.45)
要计算 .usdz
模型任何部分的边界框大小,请使用以下方法:
let car = try! ModelEntity.load(named: "car.usdz")
let carBody = car.children[0]..........children[0] as! ModelEntity
print((carBody.model?.mesh.bounds)!)