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在iOS/Swift中,MatrixHelper是哪个模块的一部分?

arkit opengl-es matrix swift ios

MonkeyBonkey · 技术社区 · 9 年前

https://medium.com/@yatchoi/getting-started-with-arkit-real-life-waypoints-1707e3cb1da2 我在下面 unresolved identifier 'MatrixHelper'

    let translationMatrix = MatrixHelper.translate(
        x: 0,
        y: 0,
        z: distance * -1
    )
    // Rotation matrix theta degrees
    let rotationMatrix = MatrixHelper.rotateAboutY(
        degrees: bearing * -1
    )

2 回复 | 直到 9 年前

Retterdesdialogs 9 年前

与MatrixHelper。rotateAboutY()他调用了如下内容:

GLKMatrix4 GLKMatrix4Rotate(GLKMatrix4 matrix, float radians, float x, float y, float z);

因此,MatrixHelper中使用的包是GLKit,更准确地说是GLKMatrix4

https://developer.apple.com/documentation/glkit/glkmatrix4-pce

Darius Miliauskas 8 年前

您可以避免使用MatrixHelper(也可以 GLKit公司

func getTranslationMatrix(tx: Float, ty: Float, tz: Float) -> simd_float4x4 {
    var translationMatrix = matrix_identity_float4x4
    translationMatrix.columns.3 = simd_float4(tx, ty, tz, 1)
    return translationMatrix
}

func getRotationYMatrix(angle: Float) -> simd_float3x3 {
    let rows = [
        simd_float3(cos(angle), 0, -sin(angle)),
        simd_float3(0, 1, 0),
        simd_float3(-sin(angle), 0, cos(angle))
    ]
    return float3x3(rows: rows)
}

或更具体的转换矩阵:

func getTranslationZMatrix(tz: Float) -> simd_float4x4 {
    var translationMatrix = matrix_identity_float4x4
    translationMatrix.columns.3.z = tz
    return translationMatrix
}

然后代码看起来像:

func getTransformGiven(currentLocation: CLLocation) -> matrix_float4x4 {
         let bearing = bearingBetween(
             startLocation: currentLocation,
            endLocation: location
        )
         let distance: Float = 5
        let originTransform = matrix_identity_float4x4
        // Create a transform with a translation of 5meter away
        //        let translationMatrix = MatrixHelper.translate(
        //            x: 0,
        //            y: 0,
        //            z: distance * -1
       //        )
              let translationMatrix = getTranslationZMatrix(tz: distance * -1) 
      // Rotation matrix theta degrees               
      //        let rotationMatrix = MatrixHelper.rotateAboutY(
      //            degrees: bearing * -1
      //        )
              let rotationMatrix = getRotationYMatrix(angle: Float(bearing * 180 / Double.pi))
              var transformMatrix = simd_mul(rotationMatrix, translationMatrix)
              return simd_mul(originTransform, transformMatrix)
        }