Questions about meshes loaded in the scene？

Questions
1

Hello guys, I’m here again. I imported meshes into Babylon(from 3ds Max), about 200 meshes in total. I want to operate on some of them. How can I get them? I know the problem may be simple, but I am a beginner, and don’t know how to do. And I want to know how to apply collisions to all meshes besides declaring one by one.

2

Hey no worries!
So to get a specific mesh, the best is to use scene.getMeshByName("foo").

Then if you want to apply something to all of them:

scene.meshes.forEach(m => {
 m.checkCollisions = true
});
1 Like
3

Good question!
And thanks for the answer Deltakosh but its again all code which we artists dont know how to deal with.

Where should we put this code?
Is there a way todo that in the editor?

4

Pinging @julien-moreau for the editor question

5

Also pinging @PirateJC because he could be interested to chat with you @oglu

6

@oglu you can with the editor
When you select a mesh, in the tab “Physics” in the edition tool you have a folder named “Collisions”. Just check or uncheck to the “Check Collisions”.

Don’t forget to also check “Check Collisions” in the “Physics” tab

7

Thanks Julien, will that be saved with editor if the objects are comming from maya ?

8

@oglu unfortunately not if the object comes from Maya :frowning:
Added my work on deltas on top of all my other tasks to avoid this kind of problems

Is it not possible to configure collisions from Maya? I know that it’s available in 3ds Max and Blender using the exporter

9

Thanks Julien!
Collisions arnt in the feature list for the maya exporter.

10

Thank you very much for your help. I got inspiration from it, and then I solved this problem by traversing array elements:

    Promise.all([ 
            BABYLON.SceneLoader.ImportMeshAsync(null, "model/bowuguan/"l, "4.babylon", 
            scene).then(function (result)
           { 
                for(var i=0;i<result.meshes.length;i++)
                { result.meshes[i].checkCollisions = true; }
           })
            ]).then(() => {   });

I can’t make it sense with the code you gave to me. Should I change “scene” to “result”? Or I put it in the wrong place. I haven’t been very clear about the data structure, and the official website seldom talks about it.

And I found that once I added

createDefaultVRExperience ();,

Opening the scene defaults to deviceOrientationVRHelper as the camera, and I don’t know how to control it with code.

And another new problems have arisen. I successfully imported the model on the PC and browsed it on the Web, but when I sent the whole file to my mobile phone, I could not display the model I imported. I want to know what I need to do if I want to display it on my mobile phone. This is very important for me, because the resolution requirement of the mobile terminal is lower.

%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20190423183209
微信图片_20190423183209.png1080×1920 64.8 KB

here is my codes

Thank you again.

12

Here is my codes:

var canvas = document.getElementById(“renderCanvas”);

var delayCreateScene = function () {
    var scene = new BABYLON.Scene(engine);

    var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 4, 0), scene);
    light.intensity = 5;

    var camera = new BABYLON.FreeCamera("camera1", new BABYLON.Vector3(-25, 180.8,860), scene);
    camera.setTarget(new BABYLON.Vector3(0,181,-100));
    camera.attachControl(canvas, true);

    var skybox = BABYLON.MeshBuilder.CreateBox("skyBox", {size:5000.0}, scene);
    skybox.position= new BABYLON.Vector3(0,0,0);
    var skyboxMaterial = new BABYLON.StandardMaterial("skyBox", scene);
    skyboxMaterial.backFaceCulling = false;

    var videoTexture = new BABYLON.VideoTexture("video", ["video/01.mp4"], scene, false, false);
    videoTexture.wrapU = BABYLON.Texture.CLAMP_ADDRESSMODE;
    videoTexture.wrapV = BABYLON.Texture.CLAMP_ADDRESSMODE;
    videoTexture.video.crossOrigin = "anonymous";

    skyboxMaterial.reflectionTexture = videoTexture;
    skyboxMaterial.reflectionTexture.coordinatesMode = BABYLON.Texture.FIXED_EQUIRECTANGULAR_MIRRORED_MODE;
    skyboxMaterial.diffuseColor = new BABYLON.Color3(0, 0, 0);
    skyboxMaterial.specularColor = new BABYLON.Color3(0, 0, 0);

    skybox.material = skyboxMaterial;

    scene.onPointerUp = function () {
        videoTexture.video.play();
    }

    var baseUrl = "model/bowuguan/";

    Promise.all([

        BABYLON.SceneLoader.ImportMeshAsync(null, baseUrl , "4.babylon", scene).then
        (function (result)
        {
            for(var i=0;i<result.meshes.length;i++)
            {
                result.meshes[i].checkCollisions = true;
            }

        })
    ]).then(() => { });

    scene.gravity = new BABYLON.Vector3(0, -9.8, 0);
    camera.applyGravity = true;
    camera.ellipsoid = new BABYLON.Vector3(10, 80, 10);

    scene.collisionsEnabled = true;
    camera.checkCollisions = true;

    scene.debugLayer.show();
    //scene.createDefaultVRExperience();
    return scene;
};

var engine = new BABYLON.Engine(canvas, true, { preserveDrawingBuffer: true, stencil: true });
var scene = delayCreateScene();

engine.runRenderLoop(function () {
    if (scene) {
        scene.render();
    }
});

// Resize
window.addEventListener("resize", function () {
    engine.resize();
13

Well this should work. If this is not the case the best idea is to reproduce your code in the Playground

(here is a doc to reference external assets: Using External Assets - Babylon.js Documentation)