modelMatrix
The 4x4 transformation matrix that transforms each billboard in this collection from model to world coordinates. When this is the identity matrix, the billboards are drawn in world coordinates, i.e., Earth's WGS84 coordinates. Local reference frames can be used by providing a different transformation matrix, like that returned by Transforms.eastNorthUpToFixedFrame.
const center = Cartesian3.fromDegrees(-75.59777, 40.03883);
billboards.modelMatrix = Transforms.eastNorthUpToFixedFrame(center);
billboards.add({
image : 'url/to/image',
position : new Cartesian3(0.0, 0.0, 0.0) // center
});
billboards.add({
image : 'url/to/image',
position : new Cartesian3(1000000.0, 0.0, 0.0) // east
});
billboards.add({
image : 'url/to/image',
position : new Cartesian3(0.0, 1000000.0, 0.0) // north
});
billboards.add({
image : 'url/to/image',
position : new Cartesian3(0.0, 0.0, 1000000.0) // up
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