function ScreenToWorld(point, camera)

{

var viewport = camera.viewport.toGlobal(engine.getRenderWidth(), engine.getRenderHeight());

return BABYLON.Vector3.Unproject(new BABYLON.Vector3(point.x, point.y, 0), viewport.width, viewport.height, BABYLON.Matrix.Identity(), camera.getViewMatrix(), camera.getProjectionMatrix());

}

function worldToScreen(point, camera, scene,engine) {

return BABYLON.Vector3.Project(point,

BABYLON.Matrix.Identity(),

scene.getTransformMatrix(),

camera.viewport.toGlobal(engine.getRenderWidth(), engine.getRenderHeight()));

}

方法调用

//位置一定是模型的相对空间位置

carScene.registerBeforeRender(function () {

if(carScene.meshes[37]){

var pos = worldToScreen(carScene.meshes[37].absolutePosition,

carScene.activeCamera,carScene,carEngine);

$('#qundban').removeClass('hide').css({

'top': pos.y + 'px',

'left': pos.x + 'px'

});

}

})