blocks|key|64544|text|Ian用这的答案部分地回答了你问题的第一部分。你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|64545|session.removeAnchors(Collections.singleton(startAnchor))；startPose+=+startAnchor.getPose()；endPose+=+hitResult.getHitPose()；//清理锚点startAnchor+=+null；//计算两个命中位置之间的差异向量。float+=+startPose.tx()+-+endPose.tx()；float+=+startPose.ty()+-+endPose.ty()；float+=+startPose.tz()+-+endPose.tz()；//计算直线距离。distanceMeters+=(浮)+Math.sqrt(dx*dx+%2B+dy*dy+%2B+dz*dz)；|blockquote|64546|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/45982196/how-to-measure-distance-using-arcore^0|4|1|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@$A|P|B|Q|1|R]]|C|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|C|$]]|$1|G|3|-4|5|6|7|T|8|@]|9|@]|C|$]]]|H|$I|$5|J|K|L|C|$M|N]]]]

Ian M partially answers the first part of your question with <a href="https://stackoverflow.com/questions/45982196/how-to-measure-distance-using-arcore">this</a> answer. 
Here's how you might do it: 

<blockquote>
<pre><code>Pose startPose = startAnchor.getPose();
Pose endPose = hitResult.getHitPose();

// Clean up the anchor
session.removeAnchors(Collections.singleton(startAnchor));
startAnchor = null;

// Compute the difference vector between the two hit locations.
float dx = startPose.tx() - endPose.tx();
float dy = startPose.ty() - endPose.ty();
float dz = startPose.tz() - endPose.tz();

// Compute the straight-line distance.
float distanceMeters = (float) Math.sqrt(dx*dx + dy*dy + dz*dz);
</code></pre>
</blockquote>

blocks|key|1752495|text|可以像Google项目那样使用ARCore来测量距离吗？|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1752496|是的，但是不那么精确，也不那么健壮。|1752497|与Google？项目相比，结果有多精确？|1752498|这取决于设备、环境条件、测量尺寸以及得到结果的方式。水平平面，如地面，已经估算出高度，如果我们在探测到的飞机上测量一段距离，结果并不坏。|1752499|下面是一个使用http://www.idownloadblog.com/2017/09/07/arkit-measurekit-app/的ARKit示例，我认为类似的东西也可以在ARCore中实现。|1752500|entityMap|0|LINK|mutability|MUTABLE|url|http://www.idownloadblog.com/2017/09/07/arkit-measurekit-app/^0|0|S|0|0|0|8|0|0|7|1P|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|N|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]]]

Can ARCore be used to measure the distance as the Project Google Tango does?

Yes, but with less accuracy and less robust.

How accurate is the result in comparison to the Project Google Tango?

It depends on the device, environment condition, size to measure and the way we get the result. Horizontal planes such as floors have estimated height, if we are measuring a distance on detected planes, the result is not bad.

And here's an example <a href="http://www.idownloadblog.com/2017/09/07/arkit-measurekit-app/" rel="nofollow noreferrer">http://www.idownloadblog.com/2017/09/07/arkit-measurekit-app/</a> using ARKit, I think similar things can be implemented in ARCore too.

blocks|key|64566|text|ARCore能像Google项目那样用来测量距离吗？|type|blockquote|depth|inlineStyleRanges|entityRanges|data|64567|是的，ARCore绝对可以用来测量距离。ARCore在目前的版本1.8中做得很好，尽管Tango设备使它更精确。|unstyled|64568|与Google探戈项目相比，结果有多准确？|64569|谷歌(+ARCore+)和探戈(+Tango+)是谷歌相同计划的一部分，这一点非常重要。谷歌在另一个项目“白日梦”中使用探戈的部分功能已有数月之久。谷歌的Visual+Positioning+System与这个新的“白日梦”系统同时发布，它的发源于探戈。但是ARCore有一个关键的区别:+ARCore需要一个只有back-facing+camera的设备，以及accelerometer和gyroscope。除了depth+camera之外，探戈设备还增加了sensor+Fusion。深度传感器允许更精确的定位，但它的工作距离很短，深度系统耗尽手机的电池非常快。|offset|length|style|CODE|64570|说到质量，比如Google+3或华为P30+Pro，与ARCore相比，它们的工作效果要好得多。为什么？因为跟踪传感器在预算Android手机需要一个彻底的校准，以观察一个稳健的AR体验。|64571|希望这能有所帮助。|64572|entityMap^0|0|0|0|25|P|4D|I|51|D|5F|9|5R|C|6E|D|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|U|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|V|8|@$I|W|J|X|K|L]|$I|Y|J|Z|K|L]|$I|10|J|11|K|L]|$I|12|J|13|K|L]|$I|14|J|15|K|L]|$I|16|J|17|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|18|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|19|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|D|7|1A|8|@]|9|@]|A|$]]]|R|$]]

<blockquote>
 Can ARCore be used to measure the distance as the Project Google Tango does?
</blockquote>

Yes, ARCore can definitely be used to measure the distances. And ARCore does it quite good with the current version 1.8, although Tango devices 
made it more accurately.

<blockquote>
 How accurate is the result in comparison to the Project Google Tango?
</blockquote>

ARCore and Tango are parts of the same plan for Google, and that's an important thing to keep in mind. And Google has been using parts of Tango for months in another project, Daydream Standalone. Google's <code>Visual Positioning System</code> that was announced alongside this new Daydream system has its roots in Tango. But ARCore has key difference: ARCore requires a device with just a <code>back-facing camera</code>, and with <code>accelerometer</code> and <code>gyroscope</code>. Tango devices had additionally <code>depth camera</code> besides <code>sensor Fusion</code>. Depth sensor allowed more precise positioning but its working distance was short and depth system drained phone's battery very fast.

Speaking of quality, Google Pixel 3 or Huawei P30 Pro, for example, work much better with ARCore than their counterparts. Why? Because tracking sensors in budget Android phones need a thorough calibration in order to observe a robust AR experience.

Hope this helps.

I understand that the below quote is very correct for the <a href="https://developers.google.com/tango/overview/depth-perception" rel="nofollow noreferrer">Project Google Tango</a>:

<blockquote>
 By combining Depth Perception with Motion Tracking, the device can measure distances between points in an area that aren't in the same frame.
</blockquote>

Based on the above, below are a few questions:

1. Can ARCore be used to measure the distance as the <a href="https://developers.google.com/tango/overview/depth-perception" rel="nofollow noreferrer">Project Google Tango</a> does?

2. How accurate is the result in comparison to the <a href="https://developers.google.com/tango/overview/depth-perception" rel="nofollow noreferrer">Project Google Tango</a>?

Can ARCore be used to measure object, room, structure or distances between points in an area that aren't in the same frame?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我知道下面的报价对于是非常正确的通过将深度感知和运动跟踪相结合，该设备可以测量不在同一帧中的区域内各点之间的距离。基于上述情况，以下是几个问题：1.能像那样用来测量距离吗？2.结果与相比有多精确？

问ARCore可以用来测量物体、房间、结构或不同区域内不同区域之间的距离吗？
EN

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问ARCore可以用来测量物体、房间、结构或不同区域内不同区域之间的距离吗？EN