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Questions tagged [quartz-composer]

Quartz Composer is a node-based visual programming language freely available to registered Apple developers for realtime processing and rendering animated 2D and 3D graphics with JavaScript scripting.

Quartz Composer is a node-based visual programming language freely available to registered Apple developers for processing and rendering animated 2D and 3D data.

Quartz Composer uses OpenGL, OpenCL (only in Mac OS X 10.6 and later), Core Image, Core Video, Core Audio, JavaScript, and other technologies to build an API and a developer tool around a simple visual programming paradigm. It used to be part of the Xcode development environment in macOS but is now a separate download named Additional Tools for Xcode.

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OpenCV distort trouble with still images

I'm working on a Quartz Composer plug-in with OpenCV and I have this issue with still images (only) converted to gray via cvCvtColor. I'm working on 2.4 but I had the same issue with 2.3 : Everything is OK for webcam images, and - strange, isn't…
Benoît Lahoz
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Quartz composer video recorder

I would like to create a Quartz composer that can record 10 seconds of video from a camera and then play back that video forward or backwards or with effects. Any pointers? A patch or plugin?
alonsorama
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QCView in Xcode Not Showing Image Importer

I have a composition that works as it should inside of Quartz Composer, but upon loading it into a QCView inside of Xcode fails to display the input information from importer patches (image importer and XML importer, to be specific) after building.…
emorydunn
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Javascript increment index on event

I am trying to figure out a way to increment an index of an array based on an event (such as left mouse click over a hit area). The code below sets everything to zero and briefly changes the appropriate index to 1 while the mouse is clicked but…
user1754344
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iOS: How do subtract two video frame with GPU power?

I want to do two RGB video frames subtraction with GPU processing power. i.e., The R,G,B value of each pixels of the first image subtract with the second image. Also, the result want to have negative RGB value and store in NSMutableArray. I use…
Chiu
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Where do I put Quartz Composer in XCode 4.4

The new Xcode 4.4 does not include Quartz Composer and is not installed in the folder Macintosh HD / Developer, but as an app in Applications. Quartz Composer has to download separately from the Apple Developer website. The dmg. Graphics Tools…
Jose Hipnosia
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How do you make the background of a video or picture clear in Quartz Composer?

I'd like to remove all of the black from a picture attached to a sprite so that it becomes transparent.
thescreamingdrills
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How to stack Sprites rendered inside Iterator?

I am rendering an image to a Sprite inside of an Iterator. I'd like each render (iteration) to remain on the canvas indefinitely, so that each successive render layers on top of the previous ones. How can I do this? There are no Clears or any other…
Martin
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How can I periodically update the XML Importer in Quartz Composer?

I'm new to Quartz Composer so please excuse if this is obvious ... I have a Quartz Composer composition here that imports a XML file. I'd like it to update the imported file lets say every minute. I found the "update signal" input and tried to…
thomas
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Quartz Composer in iOS

I am new to iOS platform. Is there anyway I can use quartz composer library embedded into my iPhone app? e.g I would like to get RGBA from a particular pixel from an image (UIImage) using IMAGE PIXEL. get-color-image-pixel OR can i use existing…
Thomas Moe
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QCView fails to load quartz composition from file

I'm loading a Quartz composition from a file through this code: // quartz is a QCView in the XIB file QCComposition *qc = [QCComposition compositionWithFile:@"res/wdq.qtz"]; //NSLog(@"input keys %@",[qc inputKeys]); //NSLog(@"copyright %@",[[qc…
tagyro
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Asynchronously run an NSThread, but with a delegate?

I want to launch a daemon on new thread, to my program doesn't lock up while waiting for input from the daemon, but I need a way for the main program to get information back from the daemon. I've used NSThread to fire off a new thread, but I don't…
Adam
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Sending floating point numbers to QuartzComposer via UDP with C++

In the another question a user provided a method to send data to QuartzComposer via UDP. It appears that QuartzComposer is very particular about the padding of byte data sent to it. In particular it requires that each character sent be preceded with…
speciousfool
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Detect whether a Quartz Composition in a QCView will be rendered through software or hardware

I have a feeling there are combinations of Cocoa Quartz Compositions and GPUs which can't be handled by the GPU and which fall back on the software renderer, even if Core Image is "accelerated" normally. How would I detect such a situation? Or more…
Alexander Ljungberg
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Twitch New API : URL (Helix)

Recently, Twitch bring a new API version using new endpoints etc.. I was working on the V5, but I didn't use Curl command line, I work with URL. So I decide to look at the references of the new version, trying for example to getting the followers…
L.K
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