Aframe中针对对象模型的Alpha动画 [英] Alpha Animation in Aframe for a-object-model
问题描述
我有一个3d对象,其obj和mtl文件在Aframe中使用显示。我想在其上应用动画,该动画会逐渐更改其Alpha值以实现淡出效果。
I have one 3d object with its obj and mtl file which is displayed using in Aframe. I want to apply animation on it which change its Alpha value gradually for Fade out effect.
我浏览了AFrame文档。但找不到与3d对象alpha动画有关的任何东西。
I went through AFrame doc. but couldn't find anything related to 3d object alpha animation.
推荐答案
内置的材料
组件主要与基元一起使用,因此 material = opacity:0.5
和类似的 opacity = 0.5
在这里不起作用。您需要使用自定义组件修改由模型创建的THREE.js材料。示例:
The built-in material
component primarily works with primitives, so material="opacity: 0.5"
and similarly opacity="0.5"
will not work here. You'll need to modify the THREE.js materials created by your model, using a custom component. Example:
AFRAME.registerComponent('model-opacity', {
schema: {default: 1.0},
init: function () {
this.el.addEventListener('model-loaded', this.update.bind(this));
},
update: function () {
var mesh = this.el.getObject3D('mesh');
var data = this.data;
if (!mesh) { return; }
mesh.traverse(function (node) {
if (node.isMesh) {
node.material.opacity = data;
node.material.transparent = data < 1.0;
node.material.needsUpdate = true;
}
});
}
});
然后可以使用和动画化这样的组件:
You can then use, and animate, the component like this:
<a-entity obj-model="obj: model.obj; mtl: model.mtl;" model-opacity="1">
<a-animation attribute="model-opacity"
dur="10000"
from="1"
to="0"
repeat="indefinite"></a-animation>
</a-entity>
有关其工作原理的更多信息,请参见 THREE.Material 和编写组件。
For more on how this works, see the docs on THREE.Material and writing a component.
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