如何在Autodesk-Viewer中设置元素的透明度?

问题描述

我正在尝试设置模型元素的透明度，但是我不能这样做.我正在寻找可以做到这一点的方法，但是我尝试的方法不起作用.

I'm trying to set the transparency of an element of a model, but I can't do it. I'm looking for a method that will do this, but the methods I tried did not work.

推荐答案

Viewer并没有真正提供本机/内置的功能，但是就图形操作而言，THREE.js始终是您的朋友，只要您可以参考查看器中目标元素的材质(按其dbid/nodeid):

Viewer does not really offer anything native/built-in to do this but THREE.js is always your friend in terms of graphical operations so long as you can reference the material of the target element (by its dbid/nodeid) in Viewer:

var fragList = viewer.model.getFragmentList();    

var fragIds = []

model.getData().instanceTree.enumNodeFragments(
  dbid, (fragId) => {
   fragIds.push(fragId)
});

    fragIds.forEach((fragId) => {
      //grab the material
      var material = fragList.getMaterial(fragId);

      if(material) {
        //set transparency
        material.opacity = 0.5;
        material.transparent = true;
        //mark for update
        material.needsUpdate = true
      }
    })
  });
  viewer.impl.invalidate(true, true, true) //notify renderer to update
}

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