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有些时候，我们可能并不想从外部导入的babylon导出文件，或者说不想导入完整的babylon文件，这个babylon的文件可能是动态生成的，比如不同的动画组或者材质组等等，同时载入完整的babylon文件可能会占用更高的资源。
总之babylon的文件可能来自于字符串的拼接，就像我们拼接dom那样，想通过这种方式实现模型载入，可以参考下面的代码。
//声明json格式的babylon类型数据
var modelData = {"producer":{"name":"Blender","version":"2.76 (sub 0)","exporter_version":"4.6.0","file":"test3.babylon"},
"autoClear":true,"clearColor":[0.0509,0.0509,0.0509],"ambientColor":[0,0,0],"gravity":[0,-9.81,0],
"materials":[{"name":"test3.Material","id":"test3.Material","ambient":[0.8,0.8,0.8],"diffuse":[0.64,0.64,0.64],"specular":[0.5,0.5,0.5],"emissive":[0,0,0],"specularPower":50,"alpha":1,"backFaceCulling":true,"checkReadyOnlyOnce":false}],
"multiMaterials":[],
"skeletons":[{"name":"Armature","id":0,"dimensionsAtRest":[0,3.0652,0],"bones":[
{"name":"Bone","index":0,"matrix":[1,0,0,0,0,1,0,0,0,0,-1,0,0,0,0,1],"rest":[1,0,0,0,0,1,0,0,0,0,-1,0,0,0,0,1],"parentBoneIndex":-1,"length":1},
{"name":"Bone.001","index":1,"matrix":[1,0,0,0,0,1,0,0,0,0,1,0,0,1,0,1],"rest":[1,0,0,0,0,1,0,0,0,0,1,0,0,1,0,1],"parentBoneIndex":0,"length":0.9815},
{"name":"Bone.002","index":2,"matrix":[1,0,0,0,0,1,0,0,0,0,1,0,0,0.9815,0,1],"rest":[1,0,0,0,0,1,0,0,0,0,1,0,0,0.9815,0,1],"parentBoneIndex":1,"length":1.0838}]}],
"meshes":[{"name":"Cube","id":"Cube","materialId":"test3.Material","billboardMode":0,"position":[0,0,0],"rotation":[0,0,0],"scaling":[1,1,1],"isVisible":true,"freezeWorldMatrix":false,"isEnabled":true,"checkCollisions":false,"receiveShadows":false,"skeletonId":0,"numBoneInfluencers":2
,"positions":[-0.2743,0.897,0.2743,-0.2743,-0.0422,0.2743,-0.2743,-0.0422,-0.2743,0.2743,0.897,0.2743,0.2743,-0.0422,0.2743,0.2743,0.897,-0.2743,0.2743,-0.0422,-0.2743,-0.2743,0.897,-0.2743,-0.2743,1.1148,-0.2743,-0.2743,1.1148,0.2743,0.2743,1.1148,0.2743,0.2743,1.8536,0.2743,0.2743,1.8536,-0.2743,0.2743,1.1148,-0.2743,0.2743,2.1056,-0.2743,-0.2743,2.1056,-0.2743,-0.2743,1.8536,-0.2743,-0.2743,1.8536,0.2743,0.2743,2.1056,0.2743,0.2743,3.0981,0.2743,0.2743,3.0981,-0.2743,-0.2743,2.1056,0.2743,-0.2743,3.0981,0.2743,-0.2743,3.0981,-0.2743]
,"normals":[-0.7071,0,0.7071,-0.5773,-0.5773,0.5773,-0.5773,-0.5773,-0.5773,0.7071,0,0.7071,0.5773,-0.5773,0.5773,0.7071,0,-0.7071,0.5773,-0.5773,-0.5773,-0.7071,0,-0.7071,-0.7071,0,-0.7071,-0.7071,0,0.7071,0.7071,0,0.7071,0.7071,0,0.7071,0.7071,0,-0.7071,0.7071,0,-0.7071,0.7071,0,-0.7071,-0.7071,0,-0.7071,-0.7071,0,-0.7071,-0.7071,0,0.7071,0.7071,0,0.7071,0.5773,0.5773,0.5773,0.5773,0.5773,-0.5773,-0.7071,0,0.7071,-0.5773,0.5773,0.5773,-0.5773,0.5773,-0.5773]
,"matricesWeights":[0.8258,0.1712,0,0,0.9877,0,0,0,0.9868,0,0,0,0.8257,0.1712,0,0,0.9868,0,0,0,0.8258,0.1712,0,0,0.9877,0,0,0,0.8257,0.1712,0,0,0.2042,0.7818,0,0,0.2042,0.7818,0,0,0.2042,0.7818,0,0,0.8013,0.1831,0,0,0.8013,0.1831,0,0,0.2042,0.7818,0,0,0.1482,0.849,0,0,0.1482,0.8489,0,0,0.8013,0.1831,0,0,0.8013,0.1831,0,0,0.1482,0.8489,0,0,0.9894,0,0,0,0.9903,0,0,0,0.1482,0.849,0,0,0.9903,0,0,0,0.9894,0,0,0]
,"matricesIndices":[256,0,0,256,0,256,0,256,256,256,256,513,513,256,513,513,513,513,513,2,2,513,2,2]
,"indices":[0,1,2,3,4,1,5,6,4,7,2,6,1,4,6,7,8,9,10,11,12,5,13,8,0,9,10,3,10,13,12,14,15,8,16,17,13,12,16,9,17,11,18,19,20,17,21,18,11,18,14,16,15,21,20,19,22,15,23,22,14,20,23,21,22,19,7,0,2,0,3,1,3,5,4,5,7,6,2,1,6,0,7,9,13,10,12,7,5,8,3,0,10,5,3,13,16,12,15,9,8,17,8,13,16,10,9,11,14,18,20,11,17,18,12,11,14,17,16,21,23,20,22,21,15,22,15,14,23,18,21,19]
,"subMeshes":[{"materialIndex":0,"verticesStart":0,"verticesCount":24,"indexStart":0,"indexCount":132}]
,"instances":[]}
],
"cameras":[{"name":"Camera","id":"Camera","position":[7.4811,5.3437,-6.5076],"rotation":[0.4615,-0.8149,0.0108],"fov":0.8576,"minZ":0.1,"maxZ":100,"speed":1,"inertia":0.9,"checkCollisions":false,"applyGravity":false,"ellipsoid":[0.2,0.9,0.2],"cameraRigMode":0,"interaxial_distance":0.0637,"type":"FreeCamera"}],"activeCamera":"Camera",
"lights":[{"name":"Lamp","id":"Lamp","type":0,"position":[4.0762,5.9039,1.0055],"intensity":1,"diffuse":[1,1,1],"specular":[1,1,1]}],
"shadowGenerators":[]
};
//将json转为json字符串
var strData = JSON.stringify(modelData);
BABYLON.SceneLoader.ImportMesh("", "", 'data:' + strData, scene, function (meshes, particleSystems, skeletons) {
var skeleton = skeletons[0];
var mesh = meshes[0]
});
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