[英]How to perform zoom with a Orthographic projection?
我只是尝试使用THREE.OrbitControls来执行缩放投影,但我没有得到我想要的行为。
我认为可以将viewSize更改为向左,向右,向上和向下相乘以创建近似缩放的内容
谁有更好的想法?
是的,您可以使用以下模式使用OrthographicCamera
实现缩放效果:
camera.zoom = 1.5;
camera.updateProjectionMatrix();
这也适用于PerspectiveCamera
。
three.js r.70
我有一个缩放场景的功能。 请试一试。
function zoom_all(center,size) {
// get the current lookAt vector of OrthographicCamera camera
var vectorLookAt = new THREE.Vector3(0, 0, -1);
vectorLookAt.applyQuaternion(camera.quaternion);
vectorLookAt.normalize();
// move back along lookat vector to set new position of camera
vectorLookAt.multiplyScalar(-size);
camera.position = new THREE.Vector3().addVectors(center, vectorLookAt);
// get current size of camera
var viewSize = 2 * camera.top;
var aspectRatio = 2 * camera.right / viewSize; // get aspectRatio of camera
// camera = new THREE.OrthographicCamera(
// -aspectRatio * viewSize / 2, aspectRatio * viewSize / 2,
// viewSize / 2, -viewSize / 2,
// 0.1, 1000);
// update new size for camera
viewSize = size;
// now update camera size
camera.left = -aspectRatio * viewSize / 2;
camera.right = aspectRatio * viewSize / 2;
camera.top = viewSize / 2;
camera.bottom = -viewSize / 2;
camera.near = 0.1;
camera.far = 2 * size;
camera.updateProjectionMatrix();
// you can set light to camera position
spotLight.position.set(camera.position.x, camera.position.y, camera.position.z);
// set center point for orbit control
orbitControls.center.set(center.x, center.y, center.z);
orbitControls.target.set(center.x, center.y, center.z);
}
如果有人仍然感兴趣,我根据WestLangley的回答编辑了OrbitControls以使用正交相机:
https://github.com/traversc/OrbitControls-orthographic_camera_fix/blob/master/OrbitControls.js
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