Fixes

src/main/java/com/volmit/iris/gen/layer/GenLayerBiome.java

@@ -59,6 +59,11 @@ public class GenLayerBiome extends GenLayer
 			return null;
 		}
 
+		if(!iris.getDimension().getFocusRegion().trim().isEmpty())
+		{
+			return iris.loadRegion(iris.getDimension().getFocusRegion());
+		}
+
 		return regionGenerator.fitRarity(iris.getDimension().getAllRegions(iris), bx, bz);
 	}
 

src/main/java/com/volmit/iris/object/IrisDimension.java

@@ -239,6 +239,11 @@ public class IrisDimension extends IrisRegistrant
 	@Desc("Keep this either undefined or empty. Setting any biome name into this will force iris to only generate the specified biome. Great for testing.")
 	private String focus = "";
 
+	@RegistryListBiome
+	@DontObfuscate
+	@Desc("Keep this either undefined or empty. Setting any region name into this will force iris to only generate the specified region. Great for testing.")
+	private String focusRegion = "";
+
 	@MinNumber(0.0001)
 	@MaxNumber(512)
 	@DontObfuscate

src/main/java/com/volmit/iris/object/IrisGenerator.java

@@ -41,6 +41,10 @@ public class IrisGenerator extends IrisRegistrant
 	@Desc("The opacity, essentially a multiplier on the output.")
 	private double opacity = 1;
 
+	@DontObfuscate
+	@Desc("Multiply the compsites instead of adding them")
+	private boolean multiplicitive  = false;
+
 	@MinNumber(0.001)
 	@DontObfuscate
 	@Desc("The size of the cell fractures")
@@ -252,15 +256,24 @@ public class IrisGenerator extends IrisRegistrant
 
 		int hc = (int) ((cliffHeightMin * 10) + 10 + cliffHeightMax * seed + offsetX + offsetZ);
 		double h = 0;
-		double tp = 0;
+		double tp = multiplicitive ? 1 : 0;
 
 		for(IrisNoiseGenerator i : composite)
 		{
-			tp += i.getOpacity();
-			h += i.getNoise(seed + superSeed + hc, (rx + offsetX) / zoom, (rz + offsetZ) / zoom);
+			if(multiplicitive)
+			{
+				tp *= i.getOpacity();
+				h *= i.getNoise(seed + superSeed + hc, (rx + offsetX) / zoom, (rz + offsetZ) / zoom);
+			}
+
+			else
+			{
+				tp += i.getOpacity();
+				h += i.getNoise(seed + superSeed + hc, (rx + offsetX) / zoom, (rz + offsetZ) / zoom);
+			}
 		}
 
-		double v = (h / tp) * opacity;
+		double v = multiplicitive ? h * opacity : (h / tp) * opacity;
 
 		if(Double.isNaN(v))
 		{

src/main/java/com/volmit/iris/util/GenLayer.java

@@ -13,5 +13,10 @@ public abstract class GenLayer
 		this.rng = rng;
 	}
 
+	public GenLayer()
+	{
+		this(null, null);
+	}
+
 	public abstract double generate(double x, double z);
 }