Triangle: Add setFromAttributeAndIndices().

[Mugen87]

Related issue: Fixed #22337.

Description

Added a buffer attribute version of setFromPointsAndIndices().

[WestLangley]

A similar method was added 9 years ago without demand. I am not sure it is used.

@makc ? What is the use case?

[makc]

@WestLangley like I said basically to get a Triangle out of clicked face, but it makes more sense to replace the method rather than add a new one

[makc]

btw, in my case, I came to Triangle docs page when looping over vertices looking for a one-liner to calculate face area. I did not think there was a method like setFromPointsAndIndices, but there was - unfortunately, it was outdated, too

[Mugen87]

A similar method was added 9 years ago without demand. I am not sure it is used.

Many math methods were introduced with the initial commits without a concrete usage in the library. The methods represented a basic and reasonable API of math classes. However, just because the repo does not use a method right now it does not necessarily mean we should remove it. At least it should not be a rule of thumb. Especially since most of the math methods are compact and do not noticeably impact the complexity and size of the core.

Hence, I vote to add setFromAttributeAndIndices() and also keep setFromPointsAndIndices().

[WestLangley]

However, just because the repo does not use a method right now it does not necessarily mean we should remove it.

@Mugen87 I think you were the only one who ever suggested we remove a method for that reason. ;-)

[mrdoob]

Hmm, I guess it's not much code anyway...

[mrdoob]

Thanks!