Disabled (optionally) alpha in textures, starting subdividing triangular

mesh instead

src/main/java/com/elphel/imagej/tileprocessor/ExtrinsicAdjustment.java

@@ -1996,6 +1996,7 @@ public class ExtrinsicAdjustment {
 		// find largest terrain area
 		int [] iterrains = tn. enumerateClusters(
 				terrain, // boolean [] tiles,
+				null,    // int []     num_clusters,
 				true); //boolean ordered)
 		boolean [] terrain_main = new boolean[clusters];
 		for (int i = 0; i < clusters; i++) {

src/main/java/com/elphel/imagej/tileprocessor/OpticalFlow.java

@@ -11761,7 +11761,8 @@ public class OpticalFlow {
 
 			int [] clusters = tn.enumerateClusters(
 					over_thresh, // boolean [] tiles,
-					false); // boolean ordered)
+					null,        // int []     num_clusters,
+					false);      // boolean ordered)
 			// check clusters contain super-threshold tile
 			double max_cluster = mov_thresh*mov_clust_max; // each cluster should have larger tile value to survive
 			int max_clust_num = 0;
@@ -11829,7 +11830,8 @@ public class OpticalFlow {
 
 			clusters = tn.enumerateClusters(
 					move_mask, // boolean [] tiles,
-					false); // boolean ordered)
+					null,      // int []     num_clusters,
+					false);    // boolean ordered)
 			if(show_debug_images) {		
 				for (int nTile = 0; nTile <  motion.length; nTile++) if (clusters[nTile] > 0){
 					 dbg_img[8][nTile] = clusters[nTile];

src/main/java/com/elphel/imagej/tileprocessor/TileNeibs.java

@@ -615,12 +615,14 @@ public class TileNeibs{
 	
 	/**
 	 * Enumerate clusters on rectangular area
-	 * @param tiles   selected tiles, size should be sizeX * sizeY
-	 * @param ordered if true, order tiles from largest to smallest5
+	 * @param tiles        selected tiles, size should be sizeX * sizeY
+	 * @param num_clusters if non null, will return number of clusters
+	 * @param ordered      if true, order tiles from largest to smallest5
 	 * @return integer array, where 0 is unused, 1+ cluster it belongs to
 	 */
 	public int [] enumerateClusters(
 			boolean [] tiles,
+			int []     num_clusters,
 			boolean ordered)
 	{
 		int [] waves = new int [tiles.length];
@@ -652,6 +654,9 @@ public class TileNeibs{
 				}
 			}
 		}
+		if (num_clusters != null) {
+			num_clusters[0] = numClust;
+		}
 		if (!ordered) {
 			return enum_clust;
 		}

src/main/java/com/elphel/imagej/tileprocessor/TilePlanes.java

@@ -5656,11 +5656,12 @@ public class TilePlanes {
 						boolean [] grown_sel = selections[np].clone();
 						tileNeibs.growSelection( //
 								max_grow_these,  // int        grow,           // grow tile selection by 1 over non-background tiles 1: 4 directions, 2 - 8 directions, 3 - 8 by 1, 4 by 1 more
-								grown_sel, // boolean [] tiles,
-								null);      // boolean [] prohibit,
+								grown_sel,       // boolean [] tiles,
+								null);           // boolean [] prohibit,
 						int [] clusters = tileNeibs.enumerateClusters(
 								grown_sel, // boolean [] tiles,
-								false); // boolean ordered)
+								null,      // int []     num_clusters,
+								false);    // boolean ordered)
 
 						int num_clusters = TileNeibs.getMax(
 								clusters); // int [] data)
@@ -5698,7 +5699,8 @@ public class TilePlanes {
 							int [] dbg_clusters = clusters.clone();
 							clusters = tileNeibs.enumerateClusters(
 									grown_sel, // boolean [] tiles,
-									false); // boolean ordered)
+									null,      // int []     num_clusters,
+									false);    // boolean ordered)
 							num_clusters = TileNeibs.getMax(
 									clusters);
 							if (num_clusters > 1){