What steps will reproduce the problem? 1. Create a CCNode and position it somewhere, perhaps the center of the window 2. Create a stencil node that contains vertexes with negative coordinates 2. Create a CCClippingNode with the stencil and some children 3. Add the CCClippingNode to the CCNode from step 1

What is the expected output? What do you see instead? Expected: proper clipping of the children Actual: Parts of of the children leak out

See http://dl.dropbox.com/u/74831621/stencil.png (or attached image)

What cocos2d version are you using ? 2.1rc0

What iOS / Mac SDK are you using ? ios6

Debug or Release ? Debug

iOS only: Does this happens on device ? or on the simulator ? or on both ? Both

The problem is in CCClippingNode around line 228 which clears the stencil buffer:

// draw a fullscreen solid rectangle to clear the stencil buffer
ccDrawSolidRect(CGPointZero, ccpFromSize([[CCDirector sharedDirector] winSize]), ccc4f(1, 1, 1, 1));

The problem is that CGPointZero may not be (0,0) on the screen since the Node may be subject to some transformation. It's also wrong if the node is being drawn to a different buffer (e.g. CCRenderTexture).

This code was added in 1611da9702d030f5a9767fd7a02ce8ace959b0bd https://github.com/cocos2d/cocos2d-iphone/commit/1611da9702d030f5a9767fd7a02ce8ace959b0bd

Why doesn't it use glClear? Would you accept a patch that uses glClear instead of ccDrawSolidRect?

thanks. patch applied https://github.com/cocos2d/cocos2d-iphone/commit/b02c8a8686620cfc932b90c8e1ff78d9fcbe205a