public bool IsModified(object asset)
{
var cubemap = asset as Cubemap;
var changed = false;
if (cubemap.anisoLevel != this.anisoLevel) changed = true;
if (cubemap.filterMode != this.filterMode) changed = true;
if (cubemap.mipMapBias != this.mipMapBias) changed = true;
if (cubemap.wrapMode != this.wrapMode) changed = true;
return changed;
}