问题描述
是否可以计算两个 HitResult 之间的距离?
Is it possible to calculate distance between two HitResult `s ?
或者我们如何使用 ARCore 计算实际距离(例如米)?
Or how we can calculate real distance (e.g. meters) using ARCore?
推荐答案
在 Java ARCore 中，世界单位是米(我刚刚意识到我们可能不会记录这个... aaa 看起来不像.糟糕，提交错误).通过减去两个 Pose 的平移分量，您可以得到它们之间的距离.您的代码如下所示:
In Java ARCore world units are meters (I just realized we might not document this... aaaand looks like nope. Oops, bug filed). By subtracting the translation component of two Poses you can get the distance between them. Your code would look something like this:
第一次点击hitResult:
startAnchor = session.addAnchor(hitResult.getHitPose());
第二次点击hitResult:
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);
假设这些命中结果不会发生在同一帧上，那么创建一个Anchor 很重要，因为每次调用Session.update() 时都可以重塑虚拟世界.代码>.通过使用锚点而不是仅姿势保持该位置，其姿势将更新以跟踪这些重塑中的物理特征.
Assuming that these hit results don't happen on the same frame, creating an Anchor is important because the virtual world can be reshaped every time you call Session.update(). By holding that location with an anchor instead of just a Pose, its Pose will update to track the physical feature across those reshapings.
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