diff --git a/docs/wiki/config/config_preview.yml b/docs/wiki/config/config_preview.yml
index cb7c307..c99be7c 100644
--- a/docs/wiki/config/config_preview.yml
+++ b/docs/wiki/config/config_preview.yml
@@ -47,19 +47,19 @@ groundtruths:
       - [7, 10.0]
       - [12, 16.0]
     delta:
-      - name: flactuate
-        args: {range: 1.0, center: [3, 3], distOffset: 0.5, time:[0, 12, 18]}
+      - name: fluctuate
+        args: {range: 1.0, center: [3, 3], distOffset: -0.5, time:[0, 12, 18]}
         timeline:
           - [0, 7]
           - [12, 16]
           - [18, 24]
-      - [7, change, {target: 16.0, targetTime: 12, center: [3, 3], distOffset: 0.5, time:[7]}]
-      - [16, change, {target: 10.0, targetTime: 18, center: [3, 3], distOffset: 0.5, time:[16]}]
+      - [7, change, {target: 16.0, targetTime: 12, center: [3, 3], distOffset: -0.5, time:[7]}]
+      - [16, change, {target: 10.0, targetTime: 18, center: [3, 3], distOffset: -0.5, time:[16]}]
 
   - group: humidity
     parent: temperature
     delta:
-      - [0, humidFromTemp, {dewpoint: 12.0, range: 1.0, center: [3, 3], distOffset: 0.5, time:[0, 7, 12, 16, 18]}]
+      - [0, humidFromTemp, {dewpoint: 12.0,}]
 
 behaviours:
   - group: temperature
diff --git a/src/main/scala/scim/datastruct/Configuration.scala b/src/main/scala/scim/datastruct/Configuration.scala
index 2f33abc..6ef6eac 100644
--- a/src/main/scala/scim/datastruct/Configuration.scala
+++ b/src/main/scala/scim/datastruct/Configuration.scala
@@ -117,7 +117,12 @@ case class Group(name: String, sensorParent: Option[String] = None){
 }
 
 case class Truth() extends Result[Option[Double]]
-case class FunctionArgs(args: Map[String, Any])
+case class FunctionArgs(args: Map[String, Any]) {
+  def getParam[A](param: String, fallback: A): A = {
+    // just bruteforce try to get the param, otherwise use fallback
+    try { args(param).asInstanceOf[A] } catch { case _: Throwable => fallback }
+  }
+}
 
 case class BehaviourVector(function: Vector[Option[(SimulationBehaviour, Option[FunctionArgs])]],
                            defaultFunc: SimulationBehaviour = (_: Cell, _: Time, v: Option[Double], _: Option[FunctionArgs]) => v,
diff --git a/src/main/scala/scim/lib/Library.scala b/src/main/scala/scim/lib/Library.scala
index 091b349..d94f7b2 100644
--- a/src/main/scala/scim/lib/Library.scala
+++ b/src/main/scala/scim/lib/Library.scala
@@ -313,6 +313,53 @@ package object mapUtil {
 
 }
 
+package object behaviourUtil {
+  implicit class FunctionArgsOption(optional: Option[FunctionArgs]) {
+    def getParam[B](param: String, fallback: B): B = {
+      if(optional.isEmpty) {
+        fallback
+      } else {
+        optional.get.getParam(param, fallback)
+      }
+    }
+  }
+}
+
+package object numberUtil {
+  implicit class ExtendedDouble(number: Double) {
+    def truncate(decimals: Int): Double = {
+      val n = Math.pow(10, decimals)
+      (number * n).toLong.toDouble / n
+    }
+
+    def range(min: Double, max: Double): Double = {
+      if(number < min) return min
+      if(number > max) return max
+      number
+    }
+
+    // this is not perfect if the number has accuracy problems
+    def getNumOfDecimals: Int = {
+      val limit = 1000 // just a safeguard
+      def recursiveDecimals(n: Double, run: Int): Int = {
+        if (n % 1d == 0 || run >= limit) {
+          0
+        } else {
+          1 + recursiveDecimals(n * 10, run + 1)
+        }
+      }
+      recursiveDecimals(number, 1)
+    }
+
+    def resolution(res: Double): Double = {
+      val result = (number / res).toLong.toDouble * res
+      // remove any accuracy artifacts by truncating (if resolution does not have problems)
+      result.truncate(res.getNumOfDecimals)
+    }
+  }
+
+}
+
 package object yml {
   val yaml = new Yaml
   // TODO: handle errors (invalid file/format)