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Be nicer about zero length bones for stretchy IK.

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This commit is contained in:
NathanSweet 2018-07-11 04:56:26 +02:00
parent a62e4466dd
commit ae2f771120
1 changed files with 3 additions and 3 deletions
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6
spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
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@ -161,8 +161,8 @@ public class IkConstraint implements Constraint {
else if (rotationIK < -180) rotationIK += 360;
float sx = bone.ascaleX;
if (stretch) {
float dd = (float)Math.sqrt(tx * tx + ty * ty);
if (dd > bone.data.length * sx) sx *= (dd / (bone.data.length * sx) - 1) * alpha + 1;
float b = bone.data.length * sx, dd = (float)Math.sqrt(tx * tx + ty * ty);
if (dd > b && b > 0.0001f) sx *= (dd / b - 1) * alpha + 1;
}
bone.updateWorldTransform(bone.ax, bone.ay, bone.arotation + rotationIK * alpha, sx, bone.ascaleY, bone.ashearX,
bone.ashearY);
@ -226,7 +226,7 @@ public class IkConstraint implements Constraint {
cos = -1;
else if (cos > 1) {
cos = 1;
if (stretch) sx *= ((float)Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;
if (stretch && l1 + l2 > 0.0001f) sx *= ((float)Math.sqrt(dd) / (l1 + l2) - 1) * alpha + 1;
}
a2 = (float)Math.acos(cos) * bendDir;
a = l1 + l2 * cos;