I'm trying to solve this problem 2d day and can't find solution. I've already asked at answers.unity3d.com but want to ask it here as well.

I need to transfer animation from spine to unity. Here is how it looks in spine

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JSON Export Format wrote

The Bézier curve array has 4 elements which define the control points: cx1, cy1, cx2, cy2. The X axis is from 0 to 1 and represents the percent of time between the two keyframes. The Y axis is from 0 to 1 and represents the percent of the difference between the keyframe’s values.

here is what I see in input data

    [ 0.135, 0.74, 0.918, 0.17 ]

and this is coordinates for P1=(0.135, 0.74) and P2=(0.918, 0.17).
for all cases P0 = (0, 0), P3 = (1, 1)

At unity side, I need to provide outTangent for P0 and inTangent for P3 which is keyframe[0] and keframe[1] in case of curve has just 2 points.

here is my calculation (which doesn't show correct result):
i and nextI is a keyframe indexes of P0 and P3 in AnimationCurve,
tangentArray is json array contains data specified above [cx1,cy1,cx2,cy2]
parseFloat custom method, i can't use default (float)cx1 or float.parse(cx1)

    public static void setCustomTangents(AnimationCurve curve, int i, int nextI, JsonData tangentArray){
    float cx1 = parseFloat(tangentArray[0]);
    float cy1 = parseFloat(tangentArray[1]);
    float cx2 = parseFloat(tangentArray[2]);
    float cy2 = parseFloat(tangentArray[3]);
    float time = (float)(curve.keys[nextI].time - curve.keys[i].time);
    float value = (float)(curve.keys[nextI].value - curve.keys[i].value);
     

Keyframe thisKeyframe = curve[i];
Keyframe nextKeyframe = curve[nextI];
 
float outTangent = (cy1 * value)/ (cx1 * time);
float inTangent = ((1 - cy2) * value)/ ((1 - cx2) * time);
 
thisKeyframe.outTangent = outTangent;
nextKeyframe.inTangent = inTangent;
 
curve.MoveKey(i, thisKeyframe);
curve.MoveKey(nextI, nextKeyframe);
}

This is result in unity

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It's very different, so I'll happy if someone will help me with it.