如何将3D点转换为2D透视投影？

// 定义透视投影参数
var fov = 60; // 视野角度
var aspectRatio = canvas.width / canvas.height; // 画布宽高比
var near = 0.1; // 近平面距离
var far = 100; // 远平面距离

// 定义3D点坐标
var x = 1;
var y = 2;
var z = 3;

// 计算透视投影矩阵
var tanFOV = Math.tan(fov * Math.PI / 360);
var projectionMatrix = [
  [1 / (aspectRatio * tanFOV), 0, 0, 0],
  [0, 1 / tanFOV, 0, 0],
  [0, 0, -(far + near) / (far - near), -1],
  [0, 0, -(2 * far * near) / (far - near), 0]
];

// 应用透视投影矩阵
var homogeneousPoint = [x, y, z, 1];
var projectedPoint = [
  homogeneousPoint[0] * projectionMatrix[0][0] + homogeneousPoint[1] * projectionMatrix[1][0] + homogeneousPoint[2] * projectionMatrix[2][0] + homogeneousPoint[3] * projectionMatrix[3][0],
  homogeneousPoint[0] * projectionMatrix[0][1] + homogeneousPoint[1] * projectionMatrix[1][1] + homogeneousPoint[2] * projectionMatrix[2][1] + homogeneousPoint[3] * projectionMatrix[3][1],
  homogeneousPoint[0] * projectionMatrix[0][2] + homogeneousPoint[1] * projectionMatrix[1][2] + homogeneousPoint[2] * projectionMatrix[2][2] + homogeneousPoint[3] * projectionMatrix[3][2],
  homogeneousPoint[0] * projectionMatrix[0][3] + homogeneousPoint[1] * projectionMatrix[1][3] + homogeneousPoint[2] * projectionMatrix[2][3] + homogeneousPoint[3] * projectionMatrix[3][3]
];

// 将3D点转换为2D点
var x2d = projectedPoint[0] / projectedPoint[3];
var y2d = projectedPoint[1] / projectedPoint[3];

// 输出结果
console.log("2D Point: (" + x2d + ", " + y2d + ")");