bug: teleporting breaks when teleported to position with negative z-value,

[coderofsalvation]

try teleporting to a mesh at 0,0,-10, you'll see that it throws some kindof computeBoundingSphere error.

[vincentfretin]

I also add the issue in one of my scene. I just moved up my whole scene to fix the issue.
If I remember, the issue was with square of some negative number like Math.sqrt(-20) giving NaN.
I think it was here

aframe-blink-controls/src/index.js

Line 532 in 4c53449

const root = (-v0.y - Math.sqrt(v0.y ** 2 - 4 * (0.5 * a.y) * p0.y)) / (2 * 0.5 * a.y)

Not sure how we can solve that.

[coderofsalvation]

kudos for having discovered the same (it took me a while to figure this bug out)
Anyways, my tiny math-brain does not really know what p0 v0 and a mean (energy, velocity and amplitude?).

I'm trying to fiddle with it in the javascript browser-console, thinking whether simply wrapping values in Math.abs() will do the job (I mean the output of sqrt is always positive)

$('[blink-controls]').components['blink-controls'].parabolicCurveMaxRoot = function (p0, v0, a) {
    const root = (-v0.y - Math.sqrt( Math.abs(v0.y) ** 2 - 4 * (0.5 * Math.abs(a.y) ) * Math.abs(p0.y) ) ) / (2 * 0.5 * Math.abs(a.y) )
    return root
}

will test it asap