Question

当我使用Perspective相机检查点是否在平截头体内时，它可以正常工作。但是，当我使用正交相机检查时，截头框看起来不准确。飞机设置正确。如果使用正交相机，还有其他我忽视的东西吗？

以下是我如何设置飞机..

    if((this.mouse.screenx>mouse.screen.x && this.mouse.screeny<mouse.screen.y)||
    (this.mouse.screenx<mouse.screen.x && this.mouse.screeny>mouse.screen.y)){
        topPlane.setFromCoplanarPoints(camera.position, topRight, topLeft  );
        rightPlane.setFromCoplanarPoints(camera.position, bottomRight, topRight  );
        bottomPlane.setFromCoplanarPoints(camera.position, bottomLeft,bottomRight  );
        leftPlane.setFromCoplanarPoints(camera.position, topLeft, bottomLeft  );
    }else{
        topPlane.setFromCoplanarPoints(camera.position, topLeft , topRight );
        rightPlane.setFromCoplanarPoints(camera.position, topRight , bottomRight );
        bottomPlane.setFromCoplanarPoints(camera.position,bottomRight , bottomLeft );
        leftPlane.setFromCoplanarPoints(camera.position, bottomLeft , topLeft );
    }
    nearPlane.setFromNormalAndCoplanarPoint(vector,camera.position);
    vector.set( 0, 0, 1 );
    vector.applyQuaternion( camera.quaternion );
    var vector2 = new THREE.Vector3( 0, 0, -config.camera.far );
    vector2.applyQuaternion( camera.quaternion );
    vector2.add(camera.position);
    farPlane.setFromNormalAndCoplanarPoint(vector,vector2);

Answer 1

好的，我想出了问题。我正在创建我的飞机，以便它们从相机的位置延伸，然而，这会产生锥形的锥形。在正交模式下，没有逐渐变细 - 一切都是直的，因此平截头体平面不应该从相机延伸。

我所做的是获得相机的方向：

    var vector = new THREE.Vector3( 0, 0, -1 );
    vector.applyQuaternion( camera.quaternion );

然后我用它来创建每个平面 - 例如：

        var top = topRight.clone(), right = bottomRight.clone(), bottom = bottomLeft.clone(), left = topLeft.clone();
        top.add(vector), right.add(vector), bottom.add(vector), left.add(vector);

            topPlane.setFromCoplanarPoints(top, topLeft , topRight );
            rightPlane.setFromCoplanarPoints(right, topRight , bottomRight );
            bottomPlane.setFromCoplanarPoints(bottom,bottomRight , bottomLeft );
            leftPlane.setFromCoplanarPoints(left, bottomLeft , topLeft );

我有它，所以平截头体可以倒置 - 所以一定要检查飞机是否朝向正确的方向。

正射Frustum？

1 个答案: