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[c] Fixed IK constraint NaN when a parent bone has zero scale.

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This commit is contained in:
Mario Zechner 2023-04-05 15:30:10 +02:00
parent db90982453
commit 6f63f76600
1 changed files with 6 additions and 2 deletions
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8
spine-c/spine-c/src/spine/IkConstraint.c
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@ -84,7 +84,7 @@ void spIkConstraint_apply1(spBone *bone, float targetX, float targetY, int /*boo
ty = targetY - bone->worldY; ty = targetY - bone->worldY;
break; break;
case SP_TRANSFORMMODE_NOROTATIONORREFLECTION: { case SP_TRANSFORMMODE_NOROTATIONORREFLECTION: {
s = ABS(pa * pd - pb * pc) / (pa * pa + pc * pc); s = ABS(pa * pd - pb * pc) / MAX(0.0001f, pa * pa + pc * pc);
sa = pa / bone->skeleton->scaleX; sa = pa / bone->skeleton->scaleX;
sc = pc / bone->skeleton->scaleY; sc = pc / bone->skeleton->scaleY;
pb = -sc * s * bone->skeleton->scaleX; pb = -sc * s * bone->skeleton->scaleX;
@ -94,6 +94,8 @@ void spIkConstraint_apply1(spBone *bone, float targetX, float targetY, int /*boo
default: { default: {
float x = targetX - p->worldX, y = targetY - p->worldY; float x = targetX - p->worldX, y = targetY - p->worldY;
float d = pa * pd - pb * pc; float d = pa * pd - pb * pc;
if (d > 0) d = MAX(0.0001f, d);
else d = MIN(-0.0001f, d);
tx = (x * pd - y * pb) / d - bone->ax; tx = (x * pd - y * pb) / d - bone->ax;
ty = (y * pa - x * pc) / d - bone->ay; ty = (y * pa - x * pc) / d - bone->ay;
} }
@ -177,7 +179,9 @@ void spIkConstraint_apply2(spBone *parent, spBone *child, float targetX, float t
b = pp->b; b = pp->b;
c = pp->c; c = pp->c;
d = pp->d; d = pp->d;
id = 1 / (a * d - b * c); id = a * d - b * c;
if (id > 0) id = 1 / MAX(0.0001f, id);
else id = 1 / MIN(0.0001f, id);
x = cwx - pp->worldX; x = cwx - pp->worldX;
y = cwy - pp->worldY; y = cwy - pp->worldY;
dx = (x * d - y * b) * id - px; dx = (x * d - y * b) * id - px;