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Experimental props #7

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Experimental props #7

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3 changes: 3 additions & 0 deletions src/lib/BabylonSvelte/BabylonScene.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@
let sceneStore = writable(scene);
$: $sceneStore = scene; // eslint-disable-line @typescript-eslint/no-unused-vars

export const elapsedTime = writable(0);

setContext('BabylonScene', {
getScene: () => sceneStore
});
Expand All @@ -17,6 +19,7 @@

function renderFunction() {
scene.render();
$elapsedTime += scene.deltaTime;
}

let BABYLON: typeof import('babylonjs');
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18 changes: 13 additions & 5 deletions src/routes/index.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@
BabylonGround
} from '$lib/BabylonSvelte';

let BABYLON: typeof import('babylonjs'); // Init Babylon

// Sphere falling
const fall = {
duration: 1000,
Expand All @@ -28,7 +30,7 @@

const t = tweened(4);

// Chaining a Svelte Tweens to loop infinitely (changing the tween options)
// Chaining a Svelte Tween to loop infinitely (changing the tween options)
(function loop() {
t.set(1, fall).then(() => {
t.set(4, rise).then(loop);
Expand All @@ -38,10 +40,16 @@
let spherePosition: Vector3;
$: if (spherePosition) spherePosition.y = $t; // Reactively changing the Babylon sphere's y-position with our Svelte Tween

let sphereColor: Color3;
$: if (sphereColor) sphereColor = new BABYLON.Color3($t / 4, 0, 1); // Also reactively changing the Babylon sphere's diffuseColor with our Svelte Tween (lazy example)
let elapsedTime; // Read-only timer from the scene

let refColor: Color3;
$: if (BABYLON) refColor = new BABYLON.Color3();

let BABYLON: typeof import('babylonjs');
$: if (elapsedTime && refColor)
BABYLON.Color3.HSVtoRGBToRef(($elapsedTime / 20) % 360, 1, 1, refColor); // Generate a refColor based on the scene's frame count

let sphereColor: Color3;
$: if (refColor && sphereColor) sphereColor = refColor; // Also reactively changing the Babylon sphere's diffuseColor to our refColor

onMount(async () => {
const babylonjs = await import('babylonjs');
Expand All @@ -52,7 +60,7 @@
<div class:BABYLON>
{#if BABYLON}
<BabylonEngine>
<BabylonScene>
<BabylonScene bind:elapsedTime>
<BabylonCamera position={new BABYLON.Vector3(0, 5, -10)} target={BABYLON.Vector3.Zero()} />
<BabylonHemisphericLight direction={new BABYLON.Vector3(0, 1, 0)} intensity={0.7} />
<!-- Below is two-way binding between spherePosition and position -->
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