He did say he'd written a test loop to see what was happening. Doing it this way might remove some other element that's affecting it.
Chris On 29 October 2010 09:23, Tamas Nagy <[email protected]> wrote: > Why you using offscreen composition and a for circle for rendering? > > Use an NSTimer to fire out rendering routine (or using a Core Video > displaylink), init the compositions with QCRenderer initWithComposition and > pass the a and b compostion's image to the mixing compostions something like > this: > > [QCRenderer3 setValue:[QCRenderer valueForOutputKey:@"outimage" > ofType:@"QCImage"] > forInputKey:@"inputA"]; > > Check out my CoGe source: > http://code.google.com/p/coge/source/browse/trunk/CoGe/AppController.m > > On Oct 29, 2010, at 10:10 AM, Rua Haszard Morris wrote: > > > I'm trying to use a transition patch to transition between the output of > two > > other animations. The problem I'm having is that sometimes this is not > rendering > > fast enough to be rendered in real time. It seems that rendering a frame > of the > > transition qtz occasionally balloons out to 1.5 s. > > > > I've written a test loop to investigate what's happening, and it seems > that > > every 9 or so seconds, the render takes a second or more, as opposed to > the > > usual <0.05 s. > > > > What should I do to optimise the rendering of these animations? I'd like > to be > > able to render full screen (i.e. 1280x720+) and in real time, e.g. at > frame > > rates of 30 (ideally 60) per second. I'm sure this must be possible with > Quartz! > > > > Here's the (quick & dirty!) test code. Tests were run on a 2.4 GHz > MacBook Core > > 2 Duo with 2 GB. > > > > > > NSString* inputQtz1 = [[NSBundlemainBundle] > > pathForResource:@"InputA"ofType:@"qtz"]; > > NSString* inputQtz2 = [[NSBundlemainBundle] > > pathForResource:@"InputB"ofType:@"qtz"]; > > NSString* mixQtz = [[NSBundlemainBundle] > > pathForResource:@"Dissolve"ofType:@"qtz"]; > > > > // open qtzs > > QCComposition* qtz1 = [QCComposition compositionWithFile:inputQtz1]; > > QCComposition* qtz2 = [QCComposition compositionWithFile:inputQtz2]; > > QCComposition* qtzmix = [QCCompositioncompositionWithFile:mixQtz]; > > > > // args > > NSDictionary* transitiond = [NSDictionarydictionaryWithObjectsAndKeys: > > QCCompositionInputPreviewModeKey, [NSNumbernumberWithBool:YES], > > NULL > > ]; > > > > // set up renderer(s) > > CGColorSpaceRefco = > CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB); > > QCRenderer* renderer1 = [[QCRendereralloc] > > initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co > composition:qtz1]; > > QCRenderer* renderer2 = [[QCRendereralloc] > > initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co > composition:qtz2]; > > QCRenderer* renderer3 = [[QCRendereralloc] > > initOffScreenWithSize:NSMakeSize(1280, 720) colorSpace:co > composition:qtzmix]; > > > > // now render a frame at a time for a while and see how long it takes > > double tmp, max=std::numeric_limits<double>::min(), > > min=std::numeric_limits<double>::max(), total; > > int count = 0; > > NSTimeIntervalelapsed = [NSDatetimeIntervalSinceReferenceDate]; > > for (NSTimeInterval time=0; time<60; time+=1.0/60.0) > > { > > NSAutoreleasePool* pool2 = [NSAutoreleasePoolnew]; > > > > elapsed = [NSDatetimeIntervalSinceReferenceDate]; > > [renderer1 renderAtTime:time arguments:nil]; > > [renderer2 renderAtTime:time arguments:nil]; > > [renderer3 renderAtTime:time arguments:transitiond]; > > > > tmp = ([NSDatetimeIntervalSinceReferenceDate]-elapsed); > > std::cerr << "render " << time << " took " << tmp << std::endl; > > elapsed = [NSDatetimeIntervalSinceReferenceDate]; > > count++; > > > > [pool2 release]; > > > > if (tmp < min) > > min = tmp; > > if (tmp > max) > > max = tmp; > > total += tmp; > > } > > > > std::cerr << "min " << min << std::endl; > > std::cerr << "max " << max << std::endl; > > std::cerr << "total " << total << std::endl; > > std::cerr << "average " << total/count << std::endl; > > Thanks in advance - I'm sure there's something obvious I'm not doing that > would > > speed this up.. > > Rua HM. > > > > -- > > http://cartoonbeats.com > > http://haszaristwocents.blogspot.com > > http://myspace.com/haszari > > http://last.fm/music/Haszari > > > > > > > > > > _______________________________________________ > > Do not post admin requests to the list. They will be ignored. > > Quartzcomposer-dev mailing list ([email protected] > ) > > Help/Unsubscribe/Update your Subscription: > > > http://lists.apple.com/mailman/options/quartzcomposer-dev/tamas.lov.nagy%40gmail.com > > > > This email sent to [email protected] > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/quartzcomposer-dev/psonice%40gmail.com > > This email sent to [email protected] >
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