在three.js中旋转相机无法正常工作

debugcn 发表于 Dev

未来蛋糕

我有以下代码在Three.js场景中使相机绕X轴旋转：

var cameraOrginX = 0, cameraOrginY = 0, cameraOrginZ = 0;
var cameraEndX = 0, cameraEndY = 0, cameraEndZ = 1000;
var angle = 0;

function init(){
     camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
     camera.position.set(0,0,1000);

     //ROTATE THE CAMERA
     var radians = angle * Math.PI / 180.0;

     cameraEndY = Math.cos(radians) * (cameraEndY-cameraOrginY) - Math.sin(radians) * (cameraEndZ-cameraOrginZ) + cameraOrginY;
     cameraEndZ = Math.sin(radians) * (cameraEndY-cameraOrginY) + Math.cos(radians) * (cameraEndZ-cameraOrginZ) + cameraOrginZ;
     //

     //CAMERA NEW POS
     camera.position.x = cameraOrginX + cameraEndX;
     camera.position.y = cameraOrginY + cameraEndY;
     camera.position.z = cameraOrginZ + cameraEndZ;
     console.log(camera.position.y + "   " + camera.position.z);
}

当我将角度变量设置为0时，我的相机位置为x = 0，y = 0，z = 1000；这就是期望并且是好的。

但是当我将角度更改为90度时，例如，我的位置更改为x = 0 y = -1000 z = -999,99999；而您希望位置为x = 0，y = -1000，z = 0；

为什么会这样呢？有人可以向我解释我在做什么错:)

除了0以外的所有角度都给我怪异的位置:(

如果需要更多代码或jsfidle，请问我:)

Rasheduzzaman Sourov

cameraEndY = Math.cos(radians) * (cameraEndY-cameraOrginY) - Math.sin(radians) * (cameraEndZ-cameraOrginZ) + cameraOrginY;
cameraEndZ = Math.sin(radians) * (cameraEndY-cameraOrginY) + Math.cos(radians) * (cameraEndZ-cameraOrginZ) + cameraOrginZ;

您无法cameraEndY在cameraEndZ计算中使用它，因为它已被更新。你应该使用旧的y和z这个坐标rotation计算，而不是更新的。请改用以下内容-

var cosTheta = Math.cos(radians);
var sinTheta = Math.sin(radians);

var a = cosTheta * (cameraEndY-cameraOrginY);
var b = sinTheta * (cameraEndZ-cameraOrginZ);
var c = sinTheta * (cameraEndY-cameraOrginY);
var d = cosTheta * (cameraEndZ-cameraOrginZ);


cameraEndY = a - b + cameraOrginY;
cameraEndZ = c + d + cameraOrginZ;

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