Convert obj from 3dMax to glTF

[zf455...@gmail.com]

Hi, I'm Fan. I have converted obj models exported from 3DMax to glTF by obj2gltf(https://github.com/AnalyticalGraphicsInc/obj2gltf).

But when display the glTF model in Cesium, it shows nothing, can you help me with this problem.

I upload the original obj model and the generated glTF model, mabe you can help me check if there are some format problems on the generated glTF model.

[Sean Lilley]

The glTF looks fine when I view it standalone (screenshot attached). I had to turn the globe off though because otherwise it isn't visible. Do you know what coordinate system the file is in?

var viewer = new Cesium.Viewer('cesiumContainer', {

    globe : false

});

function createModel(url) {

    var entity = viewer.entities.add({

        name : url,

        position : Cesium.Cartesian3.ZERO,

        orientation : Cesium.Quaternion.IDENTITY,

        model : {

            uri : url

        }

    });

    viewer.trackedEntity = entity;

}

createModel('../../SampleData/test/test.gltf');

[张帆]

It is in WGS84 coordinate system , I know Cesium is in WGS84 the same, so what's the problem. 

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[Sean Lilley]

I tried bypassing the entity API and constructing a model directly but it still looks like the model is under the surface. To test this I drew a sphere using the max coordinate in the glTF file (661590.1875, 244.36329650878906, -5450425.5), but the center of the sphere is clearly underground. I think this is potentially a problem with the data.

var viewer = new Cesium.Viewer('cesiumContainer', {

    //globe : false

});

var scene = viewer.scene;

var camera = viewer.camera;

var model = scene.primitives.add(Cesium.Model.fromGltf({

    url : '../../SampleData/test/test.gltf',

    modelMatrix : Cesium.Matrix4.IDENTITY,

    upAxis : Cesium.Axis.Z

}));

model.readyPromise.then(function(model) {

    // Zoom to model

    var controller = scene.screenSpaceCameraController;

    var r = 2.0 * Math.max(model.boundingSphere.radius, camera.frustum.near);

    controller.minimumZoomDistance = r * 0.5;

    var center = Cesium.Matrix4.multiplyByPoint(model.modelMatrix, model.boundingSphere.center, new Cesium.Cartesian3());

    var heading = Cesium.Math.toRadians(230.0);

    var pitch = Cesium.Math.toRadians(-20.0);

    camera.lookAt(center, new Cesium.HeadingPitchRange(heading, pitch, r * 2.0));

}).otherwise(function(error){

    window.alert(error);

});

var position = new Cesium.Cartesian3(661590.1875, 244.36329650878906, -5450425.5);

var blueEllipsoid = viewer.entities.add({

    name : 'Blue ellipsoid',

    position: position,

    ellipsoid : {

        radii : new Cesium.Cartesian3(2000000.0, 2000000.0, 2000000.0),

        material : Cesium.Color.BLUE

    }

});

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