useRender not called

[pmndrs]

useRender not called

[jean-noelp]

I found the solution!
I was not using references of my objects to update in render loop, so it was not able to update anything.

So, be carefull to follow these steps :

const geometriesRef = useRef(geometries);
geometriesRef.current = geometries;
useRender(() => {
    geometriesRef.current.map(model => {
        // update things on model
    });
});

So I think there is no bugs.

Thanks for your attention!

[drcmda]

yes, use render should be called in the render loop. this is how this demo for instance is working: https://codesandbox.io/embed/9y8vkjykyy

useRender has to be in a child component of canvas though. Do you have a codesandbox i could expect?

[jean-noelp]

Until I can isolate the relevant code, I purpose this workaround :

useEffect(() => {
        function tick() {
            // do some render stuff
        }

        if (delay !== null) {
            let id = setInterval(tick, delay);
            return () => clearInterval(id);
        }

    }, [delay]);

[drcmda]

the problem with this is that you create two frames, one for three and another one, its unclear which runs first, and it will turn into a perf sink once you have many. useRender on the other just calls its subscribers smack in the middle of threes update loop, which is fast, but also leads to deterministic results. for instance here we're painting a scene with effects, and another as a heads up display without effects: https://codesandbox.io/embed/mo0xrqrj79 so basically render effects can be orchestrated.

And there's another thing, canvas can be used multiple times (https://codesandbox.io/s/3411q86j51). If useRender was just a global effect, that would cause some tear.

Maybe you have an idea how to solve these without the canvas-tree dependency ...