I am managing a scene from external data but the users can control the camera and move some objects. When the render loop is running most of the renders result in no changes but still make the laptop fan go wild. What is the best way to skip calling scene.render() if the scene has not received any …

The solution I found: const inputChanges = pick(camera, [ 'inertialAlphaOffset', 'inertialBetaOffset', 'inertialPanningX', 'inertialPanningY', 'inertialRadiusOffset', ]) if (some(inputChanges)) { localState.isDirty = true }

This is right, you can maybe just attach to scene.onPointerObservable?

I toyed with that idea as well, but then I have to recreate the logic of detecting regular move and a drag move, which is not desirable. Ideally I would like to see this as: engine.runRenderLoop(() => { if(!camera.hasPendingChanges()){ return } scene.render() }) I might over…

Isnt that camera.onViewMatrixChangedObservable ?

I agree (only when there is no physics or animations though). hasPendingChanges can be something like camera.inertialBetaOffset === 0 && camera.inertialAlphaOffset === 0 (for an ArcRotateCamera)

Render only after user interactions

Questions

tibotiber June 10, 2022, 2:36am 7

Cross-linking another useful thread because it helped me: Pausing the render loop

2 Likes

Topic		Replies	Views
How to prevent runRenderLoop to render scene when user does not interact in the scene and the scene is static Questions engine , rendering , scene	6	845	January 31, 2023
Event when camera position/rotation change -> to trigger render Questions	8	1763	May 10, 2023
What is the correct way to render on demand Questions	33	4019	February 21, 2023
Pausing the render loop Questions	3	2685	June 10, 2022
Working with on-demand rendering loop Questions	28	315	August 6, 2024

Render only after user interactions

Related topics