Nate ：

triangles is assigned in initWithCapacity and then never changed. How did you get it to be 0? :wonder:

Sorry just dbl checked Xcode mis-lead me triangles has a address with a value of 0 at its location, not triangles = nil.

If it helps the problem is occurring on a scene transition, so maybe the polygon batch flush is happening on something that has become deallocated?

Update: found the code thats causing problem (being run on init scene)....

    this->angelActivityAnim = SkeletonAnimation::createWithFile("spine/angel-activity.json", "spine/angel-activity.atlas", 1);
    this->angelActivityAnim->setAnimation(0, "flying", true);
   this->angelActivityAnim->setPosition(Vec2(visibleSize.width / 2, visibleSize.height - 40));
    spSkeleton_setSkinByName(this->angelActivityAnim->skeleton, "off");
    spSkeleton_setSlotsToSetupPose(this->angelActivityAnim->skeleton);
    this->angelActivityAnim->setScale(Director::getInstance()->getContentScaleFactor() * 0.25);
   this->addChild(this->angelActivityAnim);

Ive added anim file as attachment if helps...

Nate ：

The example switches between the spineboy and goblins scenes without issue, not sure why your skeleton would be different. What makes you sat the code you posted is the problem?

Removing it = no crash, adding back in = crash . In polygon batch i saw the texture size was 256x128, and thus was able to pinpoint to that anim as was only one that used that texture size

Update: seems to be same problem in other parts of my app also.

Yay i just seen you've fixed bug thanks Nate

btw since cocos 3.1 is final you could update the Matrix/Vector2 to the Mat4/Vec2.

You could also add the following to SkeletonRenderer.cpp to remove warning that is missing.

        case SP_ATTACHMENT_BOUNDING_BOX: {
            break;
        }

Thanks again

Thanks great stuff