Or can I delete Xcode after I've got Quartz Composer? I don't want to keep the app if I don't have to.
3 Answers
Now you can download the Graphic Tools separately and install it where you want (https://developer.apple.com/downloads/index.action#). You don't have to download XCode at all.

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I suspect you can delete Xcode. An easy way to find out is to compress Xcode in the Finder (right click (or control-click) on it, and choose "Compress Xcode.app"), then throw away the app and run Quartz Composer. If it breaks, uncompress Xcode. If it works, you're good to go!

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If you need a standalone application based on Quartz Composer's QCView
class, you definitely need Xcode. There's alsoQCRenderer
class which is designed for low-level rendering of Quartz Composer compositions. This is the class to use if you want to be in charge of rendering a composition to a specific OpenGL context.

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