为什么移动相机并再次单击时new_position值不变？
<html>
<head>
<meta charset="UTF-8" />
<script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
<script src="https://unpkg.com/aframe-event-set-component@3.0.3/dist/aframe-event-set-component.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/donmccurdy/aframe-extras@v6.1.1/dist/aframe-extras.min.js"></script>
<script>
AFRAME.registerComponent("go_in_front_camera", {
init: function() {
var el = this.el;
el.addEventListener("click", function() {
console.log(
document.querySelector("a-scene").camera.el.object3D.position.x
);
var new_position_x = document.querySelector("a-scene").camera.el
.object3D.position.x;
var new_position_z = document.querySelector("a-scene").camera.el
.object3D.position.z;
var new_position = {
x: new_position_x - 1,
y: el.object3D.position.y,
z: new_position_z - 1
};
console.log(new_position);
el.setAttribute("animation", {
property: "position",
to: new_position,
dur: 2000,
easing: "linear"
});
});
}
});
</script>
</head>
<body>
<a-scene>
<a-entity
id="camera-rig"
position="0 0 0"
movement-controls="controls: cardboard, gamepad, keyboard, touch; constrainToNavMesh: true; speed: 0.2"
>
<a-entity
id="head"
camera
look-controls="pointerLockEnabled: true"
position="0 1.6 0"
>
<a-entity
cursor="fuse: true;fuseTimeout: 500"
animation__click="property: scale; startEvents: click; easing: easeInCubic; dur: 150; from: 0.1 0.1 0.1; to: 1 1 1"
animation__fusing="property: scale; startEvents: fusing; easing: easeInCubic; dur: 1500; from: 1 1 1; to: 0.1 0.1 0.1"
animation__mouseleave="property: scale; startEvents: mouseleave; easing: easeInCubic; dur: 500; to: 1 1 1"
geometry="primitive: ring; radiusInner: 0.002; radiusOuter: 0.003"
material="shader: flat; color: #f7f7ed;"
position="0 0 -0.1"
></a-entity>
</a-entity>
</a-entity>
<a-plane
id="ground_floor"
color="blue"
repeat="10 10"
rotation="-90 0 0"
width="30"
height="30"
></a-plane>
<a-sky color="#212120"></a-sky>
<a-box
position="0 1 -2"
width="1"
height="1"
color="red"
go_in_front_camera
></a-box>
</a-scene>
</body>
</html>
我编辑了代码以显示完整的示例。
您将盒子放置在"-"1 0-1"；关于相机。但是摄像机没有移动。它只是在旋转。所以它的世界地位根本没有改变。
任一：
- 将坐标转换到相机局部参考空间
- 获取相机方向矢量，并将其添加到相机
方向选项：
<script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
<script>
AFRAME.registerComponent('go_in_front_camera', {
init: function() {
var el = this.el;
const dir = new THREE.Vector3();
el.addEventListener('click', function() {
const acamera = document.querySelector('a-scene').camera.el.object3D
acamera.getWorldDirection(dir);
dir.multiplyScalar(-2);
dir.add(acamera.position)
el.setAttribute('animation', {
property: 'position',
to: AFRAME.utils.coordinates.stringify(dir),
dur: 2000,
easing: 'linear'
});
});
}
});
</script>
<a-scene cursor="rayOrigin: mouse" raycaster="objects: a-box">
<a-box position="-1 0.5 -3" color="#4CC3D9" go_in_front_camera></a-box>
<a-sphere position="0 1.25 -5" radius="1.25" color="#EF2D5E"></a-sphere>
<a-cylinder position="1 0.75 -3" radius="0.5" height="1.5" color="#FFC65D"></a-cylinder>
<a-plane position="0 0 -4" rotation="-90 0 0" width="4" height="4" color="#7BC8A4"></a-plane>
<a-sky color="#ECECEC"></a-sky>
<a-entity id="camera-rig" position="0 0 0" movement-controls="controls: cardboard, gamepad, keyboard, touch; constrainToNavMesh: true; speed: 0.2">
<a-entity id="head" camera look-controls="pointerLockEnabled: true" position="0 1.6 0">
<a-entity geometry="primitive: ring; radiusInner: 0.002; radiusOuter: 0.003" material="shader: flat; color: #f7f7ed;" position="0 0 -0.1"></a-entity>
</a-entity>
</a-entity>
</a-scene>由于它是一个以摄影机为子对象的装备，因此不应在摄影机对象上读取位置，而应在摄影机父对象上读取。
document.querySelector("a-scene").camera.el.parentNode.object3D.position