hello, i want to create babylon js instance with a simple function and i get :
index.php:1 Uncaught (in promise) engine should not be null.
how to do this?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Babylon.js sample code</title>
<!-- Babylon.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.6.2/dat.gui.min.js"></script>
<script src="https://preview.babylonjs.com/ammo.js"></script>
<script src="https://preview.babylonjs.com/cannon.js"></script>
<script src="https://preview.babylonjs.com/Oimo.js"></script>
<script src="https://preview.babylonjs.com/earcut.min.js"></script>
<script src="https://preview.babylonjs.com/babylon.js"></script>
<script src="https://preview.babylonjs.com/materialsLibrary/babylonjs.materials.min.js"></script>
<script src="https://preview.babylonjs.com/proceduralTexturesLibrary/babylonjs.proceduralTextures.min.js"></script>
<script src="https://preview.babylonjs.com/postProcessesLibrary/babylonjs.postProcess.min.js"></script>
<script src="https://preview.babylonjs.com/loaders/babylonjs.loaders.js"></script>
<script src="https://preview.babylonjs.com/serializers/babylonjs.serializers.min.js"></script>
<script src="https://preview.babylonjs.com/gui/babylon.gui.min.js"></script>
<script src="https://preview.babylonjs.com/inspector/babylon.inspector.bundle.js"></script>
<style>
html, body {
overflow: hidden;
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
#renderCanvas {
width: 100%;
height: 100%;
touch-action: none;
}
</style>
</head>
<body>
<canvas id="renderCanvas"></canvas>
<script>
function create_babylon(){
var canvas = document.getElementById("renderCanvas");
var engine = null;
var scene = null;
var sceneToRender = null;
var createDefaultEngine = function() { return new BABYLON.Engine(canvas, true, { preserveDrawingBuffer: true, stencil: true, disableWebGL2Support: false}); };
const createScene = () => {
const scene = new BABYLON.Scene(engine);
const camera = new BABYLON.ArcRotateCamera("Camera", 3 * Math.PI / 4, Math.PI / 4, 4, BABYLON.Vector3.Zero(), scene);
camera.attachControl(canvas, true);
const light = new BABYLON.HemisphericLight("light", new BABYLON.Vector3(1, 1, 0));
const box = BABYLON.MeshBuilder.CreateBox("box", {height: 1, width: 0.75, depth: 0.25});
return scene;
};;
window.initFunction = async function() {
var asyncEngineCreation = async function() {
try {
return createDefaultEngine();
} catch(e) {
console.log("the available createEngine function failed. Creating the default engine instead");
return createDefaultEngine();
}
}
window.engine = await asyncEngineCreation();
if (!engine) throw 'engine should not be null.';
window.scene = createScene();};
initFunction().then(() => {sceneToRender = scene
engine.runRenderLoop(function () {
if (sceneToRender && sceneToRender.activeCamera) {
sceneToRender.render();
}
});
});
// Resize
window.addEventListener("resize", function () {
engine.resize();
});
}
create_babylon();
</script>
</body>
</html>
It works if you put into your create_babylon function just the part that calls the initFunction and handles the engine’s render loop and resize, like below.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Babylon.js sample code</title>
<!-- Babylon.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.6.2/dat.gui.min.js"></script>
<script src="https://preview.babylonjs.com/ammo.js"></script>
<script src="https://preview.babylonjs.com/cannon.js"></script>
<script src="https://preview.babylonjs.com/Oimo.js"></script>
<script src="https://preview.babylonjs.com/earcut.min.js"></script>
<script src="https://preview.babylonjs.com/babylon.js"></script>
<script src="https://preview.babylonjs.com/materialsLibrary/babylonjs.materials.min.js"></script>
<script src="https://preview.babylonjs.com/proceduralTexturesLibrary/babylonjs.proceduralTextures.min.js"></script>
<script src="https://preview.babylonjs.com/postProcessesLibrary/babylonjs.postProcess.min.js"></script>
<script src="https://preview.babylonjs.com/loaders/babylonjs.loaders.js"></script>
<script src="https://preview.babylonjs.com/serializers/babylonjs.serializers.min.js"></script>
<script src="https://preview.babylonjs.com/gui/babylon.gui.min.js"></script>
<script src="https://preview.babylonjs.com/inspector/babylon.inspector.bundle.js"></script>
<style>
html, body {
overflow: hidden;
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
#renderCanvas {
width: 100%;
height: 100%;
touch-action: none;
}
</style>
</head>
<body>
<canvas id="renderCanvas"></canvas>
<script>
var canvas = document.getElementById("renderCanvas");
var engine = null;
var scene = null;
var sceneToRender = null;
var createDefaultEngine = function() { return new BABYLON.Engine(canvas, true, { preserveDrawingBuffer: true, stencil: true, disableWebGL2Support: false}); };
const createScene = () => {
const scene = new BABYLON.Scene(engine);
const camera = new BABYLON.ArcRotateCamera("Camera", 3 * Math.PI / 4, Math.PI / 4, 4, BABYLON.Vector3.Zero(), scene);
camera.attachControl(canvas, true);
const light = new BABYLON.HemisphericLight("light", new BABYLON.Vector3(1, 1, 0));
const box = BABYLON.MeshBuilder.CreateBox("box", {height: 1, width: 0.75, depth: 0.25});
return scene;
};;
window.initFunction = async function() {
var asyncEngineCreation = async function() {
try {
return createDefaultEngine();
} catch(e) {
console.log("the available createEngine function failed. Creating the default engine instead");
return createDefaultEngine();
}
}
window.engine = await asyncEngineCreation();
if (!engine) throw 'engine should not be null.';
window.scene = createScene();};
function create_babylon() {
initFunction().then(() => {sceneToRender = scene
engine.runRenderLoop(function () {
if (sceneToRender && sceneToRender.activeCamera) {
sceneToRender.render();
}
});
});
// Resize
window.addEventListener("resize", function () {
engine.resize();
});
}
create_babylon();
</script>
</body>
</html>
what i am trying to achieve is that the js function will add everything, all the required babylon scripts, styles, etc, to head and then initialize babylon, this is not a solution for me
Aah, well you can wait to set the styling and append the scripts at runtime, then when they’re done loading call the create_babylon() function. I don’t time to make an example right now thou.
Thank you for your time, yes i will do all the script injections to head later, thats the easy part, first of all i neet to make babylon load everything from one function without any bugs
In order to work without many changes I changed the engine part from async to usual.
For me it works (see attached file). It also works at Resources Archives - BabylonPress, letting to display several canvases on one page (every canvas has ID like renderCanvas-POSTID). index.zip (1.2 KB)
