[Bas]

hi,

 

i noticed that when using particles i got a framedrop of 20 from 60 to 40

what could cause this?

 

    ParticleSystem {
        id: sys
    }

    ImageParticle {
        system: sys
        source: "../../assets/pong/particles/bubble.png"
        color: "white"
        colorVariation: 0.3
        alpha: 0.1
        entryEffect: ImageParticle.None
        z:100
    }
    Emitter {
        id: emitter
        system: sys
        sizeVariation:0.5
        velocity: PointDirection {xVariation:20;  y: -40; yVariation: -24}
        lifeSpan: emitAmount
        emitRate: 20
        enabled: false
        size: 32
        endSize:0
        x:bal.x
        y:bal.y
        z:100
    }

    Timer {
        id:tid
        running:true
        repeat:true
        onTriggered: {
            emitAmount+=10
        }
        interval:1030
    }

 

[GüntherFelgo Team]

Hi Bas!

Particle effects are performance intensive in general. How big the impact actually is mostly depends on the device hardware and the complexity of the particles.
You can have a look at which properties affect the performance the most in the ParticleVPlay documentation. This component should also allow you to reduce the amount of code, as you only need this one component instead of the System, Emitter and ImageParticle.

We also noticed that performance can get better once a particle effect is loaded or used several times. I guess this is due to some internal performance improvements of the Qt particle system at runtime. Maybe gradually changing a particle property, like the lifeSpan in your example, can also limit the capabilities of these improvements.

I suggest you play around with the particle complexity until you reach a good balance between performance and looks.

Best,
Günther

[Bas]

hi Günther,

The app is running on a desktop machine i7 (old one) and gfx card AMD Radeon R9 200 / HD 7900 Series windows 8.1

so the hardware is not the issue, i guess 🙂

I will play with the parameters and come back if i found something.

[Bas]

i forget to tell that i use the particles in a desktop app 1920×1080 dims.

[Bas]

i get good

    Item {
        id: fakeEmitter
        function burst(number) {
            while (number > 0) {
                var item = fakeParticle.createObject(pScene);
                item.duration = 500 + Math.random() * 1000;
                item.lifeSpan = 100 + Math.random() * 1000;
                item.x = ball.x + Math.random() * 40 - 80;
                item.y = ball.y + Math.random() * 40 - 80;
                item.z = Math.round( Math.random() * 200 );
                item.width = item.height = 8 + Math.round(Math.random()*24)
                item.yAnim.start();
                number--;
            }
        }
    }

    Component {
        id: fakeParticle
        Image {
            id: container
            property int duration:20
            property int lifeSpan: 10000
            property alias yAnim:yAnim
            width: 32
            height: 32
            source: Qt.resolvedUrl("../../assets/pong/bubble.png")
            PropertyAnimation {id:yAnim; target:container; property:"y"; from:container.y; to: -64; duration: container.duration; running: false;
                easing.type: Easing.InCirc;
                onStopped: container.destroy();
            }
            SequentialAnimation on opacity {
                running: yAnim.running
                NumberAnimation { from:0; to: 1; duration: 200}
                PauseAnimation { duration: Math.round(container.duration*0.6) }
                NumberAnimation { from:1; to: 0; duration: 500}
                ScriptAction { script: container.destroy(); }
            }
        }
    }

 

results with 1920 x 1080 when using a fake particle emitter

 

[GüntherFelgo Team]

Hi Bas,
I guess the high resolution of 1920×1080 could also be a factor that affects particle performance.
If the complexity of the effect created by your own fake emitter is good enough and the performance is indeed better, this seems to be a good workaround.

Thanks for sharing that solution!

Best,
Günther