Biome height support

src/main/java/ru/betterend/util/sdf/operator/SDFRadialNoiseMap.java

@@ -0,0 +1,60 @@
+package ru.betterend.util.sdf.operator;
+
+import net.minecraft.util.math.MathHelper;
+import ru.betterend.noise.OpenSimplexNoise;
+import ru.betterend.util.MHelper;
+
+public class SDFRadialNoiseMap extends SDFDisplacement {
+	private static final float SIN = MathHelper.sin(0.5F);
+	private static final float COS = MathHelper.cos(0.5F);
+	
+	private OpenSimplexNoise noise;
+	private float intensity = 1F;
+	private float radius = 1F;
+	private short offsetX;
+	private short offsetZ;
+	
+	public SDFRadialNoiseMap() {
+		setFunction((pos) -> {
+			if (intensity == 0) {
+				return 0F;
+			}
+			float px = pos.getX() / radius;
+			float pz = pos.getZ() / radius;
+			float distance = MHelper.lengthSqr(px, pz);
+			if (distance > 1) {
+				return 0F;
+			}
+			distance = 1 - MathHelper.sqrt(distance);
+			float nx = px * COS - pz * SIN;
+			float nz = pz * COS + px * SIN;
+			distance *= getNoise(nx * 0.75 + offsetX, nz * 0.75 + offsetZ);
+			return distance * intensity;
+		});
+	}
+	
+	private float getNoise(double x, double z) {
+		return (float) noise.eval(x, z) + (float) noise.eval(x * 3 + 1000, z * 3) * 0.5F + (float) noise.eval(x * 9 + 1000, z * 9) * 0.2F;
+	}
+	
+	public SDFRadialNoiseMap setSeed(long seed) {
+		noise = new OpenSimplexNoise(seed);
+		return this;
+	}
+	
+	public SDFRadialNoiseMap setIntensity(float intensity) {
+		this.intensity = intensity;
+		return this;
+	}
+	
+	public SDFRadialNoiseMap setRadius(float radius) {
+		this.radius = radius;
+		return this;
+	}
+	
+	public SDFRadialNoiseMap setOffset(int x, int z) {
+		offsetX = (short) (x & 32767);
+		offsetZ = (short) (z & 32767);
+		return this;
+	}
+}