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POCocos2d: CCSpriteBatchNode grandchildren z-order displaying in wrong order
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copied!<p>I thought I understood how z order works in cocos2d, but I'm having an issue I can't explain. </p> <p>I have a number of CCSprites as children of a CCSpriteBatchNode, created with the code below. Each of these sprites has several children CCSprites. Everything works fine as long as the z values I pass to addChild are positive. When they are negative, it stops working as I expect, and I can't find any information about why this could be the case. I am using cocos2d version 1.0.1.</p> <pre><code> CCSprite *pikaSprite = [CCSprite spriteWithSpriteFrameName:@"PikaLarge.png"]; [pikaSprite setAnchorPoint:ccp(0.0f, 0.5f)]; [pikaSprite setPosition:ccp(pikaX, pikaBox.boundingBox.size.height * 0.6f)]; [pikaBatchNode addChild:pikaSprite z:0]; CCSprite *sprite1 = [CCSprite spriteWithSpriteFrameName:@"Sprite1.png"]; [sprite1 setPosition:ccp(pikaSprite.boundingBox.size.width * 0.7f, pikaSprite.boundingBox.size.height * 0.9f)]; [pikaSprite addChild:sprite1 z:-1]; CCSprite *sprite2 = [CCSprite spriteWithSpriteFrameName:@"Sprite2.png"]; [sprite2 setPosition:ccp(pikaSprite.boundingBox.size.width * 0.8f, pikaSprite.boundingBox.size.height * 0.9f)]; [pikaSprite addChild:sprite2 z:-10]; </code></pre> <p>sprite2 appears in front of sprite1, but behind pikaSprite. As I understand it, it should be behind sprite1, because they are siblings and sprite2 has a lower z value.</p> <p>I want sprite2 to be behind sprite1, both behind pikaSprite, which I can't get unless I change the order I add them, which is possible, but somewhat more difficult.</p> <p>I've tried four different orderings, this is the only one that doesn't work.</p> <p>1.</p> <pre><code> [pikaSprite addChild:sprite1 z:1]; ... [pikaSprite addChild:sprite2 z:10]; // sprite2 is in front, correct </code></pre> <p>2.</p> <pre><code> [pikaSprite addChild:sprite1 z:10]; // sprite1 is in front, correct ... [pikaSprite addChild:sprite2 z:1]; </code></pre> <p>3.</p> <pre><code> [pikaSprite addChild:sprite1 z:-10]; ... [pikaSprite addChild:sprite2 z:-1]; // sprite2 is in front, correct </code></pre> <p>4.</p> <pre><code> [pikaSprite addChild:sprite1 z:-1]; ... [pikaSprite addChild:sprite2 z:-10]; // sprite2 is in front - ??? </code></pre> <p>When they are negative, it seems the last one added is always in front.</p> <p>It would be possible to rewrite things to deal with this, but I'm very curious why this is happening and wondering if I might be misunderstanding something.</p> <p>Thanks for any insight you can give me.</p>

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