spark-ar-lookat-example | How to use the Look AT api in Spark AR

by aferriss JavaScript Version: Current License: No License

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kandi X-RAY | spark-ar-lookat-example Summary

spark-ar-lookat-example is a JavaScript library typically used in Big Data, Spark applications. spark-ar-lookat-example has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

How to use the Look AT api in Spark AR

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spark-ar-lookat-example has a low active ecosystem.

It has 19 star(s) with 7 fork(s). There are 3 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 2 have been closed. On average issues are closed in 14 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of spark-ar-lookat-example is current.

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spark-ar-lookat-example has 0 bugs and 0 code smells.

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spark-ar-lookat-example code analysis shows 0 unresolved vulnerabilities.

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Community Discussions

Trending Discussions on spark-ar-lookat-example

How to use SparkAR's LookAt when parents of the object to rotate have a rotation

QUESTION

How to use SparkAR's LookAt when parents of the object to rotate have a rotation

Asked 2021-Feb-01 at 14:07

In SparkAR I want to have an element (called toRotate) that always looks at the camera, similarly to what already asked here (but the accepted solution is not satisfactory to me and I do not have enough reputation to answer with a comment to it).

The catch is that this element is in a hierarchy that cannot be modified: the order must absolutely be root->planeTracker->parent->toRotate as shown in this screenshot (seems like I do not have enough reputation to inbed the image).

By using the lookAt function (thanks to this github repo I understood that I had to create a toRotateDuplicate sibiling to toRotate and with same local position, and then use its transform instead) I can have it working just fine when in the Editor but once I try it on device my toRotate has a weird rotation instead..

After some tests, I could tell that the issue was coming from the fact that the planeTracker has a rotaion equal to Quaternion.Identity only on editor, while on device the value varies.
This is also proved by the fact that if replacing the planeTracker by an empty node and applying a not-identity rotation to it, we have the "weird rotation" issue even on editor.

This is my code:

...

ANSWER

Answered 2021-Feb-01 at 12:34

I've found an "hacky" solution:
Create another sibiling to our toRotate called cameraDuplicate, which mirrors the worldPosition of the Camera object.. Since all used transform in the lookAt logic are on the same hierarchy level now, I can use local transforms instead of the world ones ^^'

This is the updated code:

Source https://stackoverflow.com/questions/65992708

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