On Tuesday 26 April 2016 22:27:16 Oleg Evseev wrote:
> Hi, Ramy and Sean
>
> > Something like this should do it (not tested)
>
> Thank you, Sean. Correct it little bit, tested, it works:
>
> Entity {
>
> id: mainEntity
>
> property real progress: 0.0
>
> property real rotationSpeed: -1.0
>
> property real angle: previousAngle + ( progress * 360.0 *
> rotationSpeed )
>
> property real previousAngle: 0.0
>
>
> function updatePreviousRotation() {
>
> mainEntity.previousAngle = mainEntity.angle % 360;
>
> }
>
>
> TorusMesh { id: mesh; radius: 5; minorRadius: 1; rings: 100;
> slices: 20 }
>
> PhongMaterial { id: material }
>
>
> //for some reason in this test project using just "angle" leads to
> ReferenceError,
> // but in another project it's all right to use Entity properties in
> Transform without Entity id
>
> Transform {id: transform; rotation: fromEulerAngles(0,
> mainEntity.angle, 0) }
>
>
> SequentialAnimation {
>
> running: true
>
> loops: Animation.Infinite
>
>
> NumberAnimation {
>
> target: mainEntity; property: "progress"
>
> from: 0.0; to: 1.0
>
> duration: 1000
>
> }
>
>
> ScriptAction {
>
> script: {
>
> mainEntity.updatePreviousRotation();
>
> mainEntity.rotationSpeed += 0.1;
>
> }
>
> }
>
> components: [ mesh, material, transform ] }
> }
>
>
> rotationSpeed defines cycles per second.
>
> But now I have another related question. To compute rotationSpeed from
> vehicle linear speed one needs wheel radius. If I use different vehicle
> models with distinct size of wheels, I need to know sizes of a mesh
> (something like size of 3d model collision box).
> Is there a way to get mesh cube size?
At the moment, no. This is something we may well add for 5.8. For now you'll
need to calculate it yourself or pass it in as metadata somehow.
Cheers,
Sean
>
> Regards, Oleg
--
Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK
KDAB (UK) Ltd, a KDAB Group company
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