/**
* Batches a collection of Geometries so that all with the same material get combined.
*
* @param geometries The Geometries to combine
* @return A List of newly created Geometries, each with a distinct material
*/
public static List<Geometry> makeBatches(Collection<Geometry> geometries, boolean useLods) {
ArrayList<Geometry> retVal = new ArrayList<Geometry>();
HashMap<Material, List<Geometry>> matToGeom = new HashMap<Material, List<Geometry>>();
for (Geometry geom : geometries) {
List<Geometry> outList = matToGeom.get(geom.getMaterial());
if (outList == null) {
// trying to compare materials with the contentEquals method
for (Material mat : matToGeom.keySet()) {
if (geom.getMaterial().contentEquals(mat)) {
outList = matToGeom.get(mat);
}
}
}
if (outList == null) {
outList = new ArrayList<Geometry>();
matToGeom.put(geom.getMaterial(), outList);
}
if (geom.getCullHint() != CullHint.Always) {
outList.add(geom);
}
}
int batchNum = 0;
for (Map.Entry<Material, List<Geometry>> entry : matToGeom.entrySet()) {
Material mat = entry.getKey();
List<Geometry> geomsForMat = entry.getValue();
Mesh mesh = new Mesh();
mergeGeometries(geomsForMat, mesh);
// lods
if (useLods) {
makeLods(geomsForMat, mesh);
}
mesh.updateCounts();
Geometry out = new Geometry("batch[" + (batchNum++) + "]", mesh);
out.setMaterial(mat);
out.updateModelBound();
retVal.add(out);
}
return retVal;
}
