为什么我需要在每个切片部分之间添加空ccclippingnode？

Question

我用ccclipingnode将球分成两部分。但我发现我需要创建空的ccclipingnode或者修剪奇怪的东西。

if(new1VecsCount>=3)addChild(Box2dItemSlice::createSliceBody(box->box2dBody->GetPosition(), box->box2dBody->GetAngle(), new1VecsSorted, new1VecsCount,pRot1));
addChild(CCClippingNode::create(CCNode::create()));
if(new2VecsCount>=3)addChild(Box2dItemSlice::createSliceBody(box->box2dBody->GetPosition(), box->box2dBody->GetAngle(), new2VecsSorted, new2VecsCount,pRot2));
addChild(CCClippingNode::create(CCNode::create()));

Answer 1

这是解决方案：http://blog.csdn.net/jusnxie/article/details/9277121

转到CCClippingNode :: visit函数，找到“ccDrawSolidRect”行并修改：

glStencilFunc(GL_NEVER, mask_layer, mask_layer);  
glStencilOp(!m_bInverted ? GL_ZERO : GL_REPLACE, GL_KEEP, GL_KEEP);  winSize]), ccc4f(1, 1, 1, 1));  
ccDrawSolidRect(CCPointZero, ccpFromSize(CCDirector::sharedDirector()->getWinSize()), ccc4f(1, 1, 1, 1));  

更改为：

glStencilFunc(GL_NEVER, mask_layer, mask_layer);  
glClearStencil(!m_bInverted ? 0 : ~0);  
glStencilOp(!m_bInverted ? GL_ZERO : GL_REPLACE, GL_KEEP, GL_KEEP);  winSize]), ccc4f(1, 1, 1, 1));  
ccDrawSolidRect(CCPointZero, ccpFromSize(CCDirector::sharedDirector()->getWinSize()), ccc4f(1, 1, 1, 1));  
glClear(GL_STENCIL_BUFFER_BIT);  

你只需要添加“glClearStencil（！m_bInverted？0：~0）;”和“glClear（GL_STENCIL_BUFFER_BIT）;”到了正确的位置。