trail append.js

    trail.data.shift(); trail.data.shift(); trail.data.shift(); trail.data.shift();
    trail.data.push(newPos.x, newPos.y, newPos.z, 0.);
    if (!trail.texture) {
        trail.texture = BABYLON.RawTexture.CreateRGBATexture(new Float32Array(trail.data), 1, trail.data.length / 4, scene, false, false, BABYLON.Texture.LINEAR_LINEAR, BABYLON.Engine.TEXTURETYPE_FLOAT);
        trail.trackSampler0Block.texture = trail.texture;
        trail.trackSampler1Block.texture = trail.texture;
    } else {
        trail.texture.update(new Float32Array(trail.data));
    }