this.sightline.setAttributes(viewableRegions); this.sightline.setOccludeAttributes(blockedRegions); this.sightline.setAltitudeMode(WorldWind.RELATIVE_TO_GROUND); this.sightlinePlacemark = new Placemark(pos); this.sightlinePlacemark.setAltitudeMode(WorldWind.RELATIVE_TO_GROUND);