diff --git a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Aquagen.kt b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Aquagen.kt
index d100f4bc7..7653a8cc2 100644
--- a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Aquagen.kt
+++ b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Aquagen.kt
@@ -2,7 +2,6 @@ package net.torvald.terrarum.modulebasegame.worldgenerator
 
 import com.sudoplay.joise.Joise
 import com.sudoplay.joise.module.*
-import net.torvald.terrarum.BlockCodex
 import net.torvald.terrarum.INGAME
 import net.torvald.terrarum.LoadScreenBase
 import net.torvald.terrarum.blockproperties.Block
@@ -19,7 +18,7 @@ import kotlin.math.sin
  */
 class Aquagen(world: GameWorld, isFinal: Boolean, val groundScalingCached: ModuleCache, seed: Long, params: Any) : Gen(world, isFinal, seed, params) {
 
-    private val isAlpha2 = ((params as TerragenParams).version >= 0x0000_000004_000004)
+    private val isAlpha2 = ((params as TerragenParams).versionSince >= 0x0000_000004_000004)
 
     private val FLUID_FILL = 1.2f
 
diff --git a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Cavegen.kt b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Cavegen.kt
index e49e60166..e447194a2 100644
--- a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Cavegen.kt
+++ b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Cavegen.kt
@@ -16,7 +16,7 @@ import kotlin.math.sin
  */
 class Cavegen(world: GameWorld, isFinal: Boolean, val highlandLowlandSelectCache: ModuleCache, seed: Long, params: Any) : Gen(world, isFinal, seed, params) {
 
-    private val isAlpha2 = ((params as TerragenParams).version >= 0x0000_000004_000004)
+    private val isAlpha2 = ((params as TerragenParams).versionSince >= 0x0000_000004_000004)
 
     override fun getDone(loadscreen: LoadScreenBase?) {
         loadscreen?.let {
diff --git a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Oregen.kt b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Oregen.kt
index 7f5843cd7..4e3da8dc5 100644
--- a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Oregen.kt
+++ b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Oregen.kt
@@ -13,9 +13,9 @@ import kotlin.math.sqrt
 /**
  * Created by minjaesong on 2023-10-25.
  */
-class Oregen(world: GameWorld, isFinal: Boolean, private val caveAttenuateBiasScaledCache: ModuleCache, seed: Long, private val ores: List<OregenParams>) : Gen(world, isFinal, seed) {
+class Oregen(world: GameWorld, isFinal: Boolean, private val caveAttenuateBiasScaledCache: ModuleCache, seed: Long, private val ores: List<OregenParams>, terragenParams: TerragenParams) : Gen(world, isFinal, seed, terragenParams) {
 
-    private val isAlpha2 = ((params as TerragenParams).version >= 0x0000_000004_000004)
+    private val isAlpha2 = (terragenParams.versionSince >= 0x0000_000004_000004)
 
     override fun getDone(loadscreen: LoadScreenBase?) {
         loadscreen?.let {
diff --git a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Terragen.kt b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Terragen.kt
index bd266e20e..c1fcfd56a 100644
--- a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Terragen.kt
+++ b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Terragen.kt
@@ -18,7 +18,7 @@ import kotlin.math.sin
  */
 class Terragen(world: GameWorld, isFinal: Boolean, val groundScalingCached: ModuleCache, seed: Long, params: Any) : Gen(world, isFinal, seed, params) {
 
-    private val isAlpha2 = ((params as TerragenParams).version >= 0x0000_000004_000004)
+    private val isAlpha2 = ((params as TerragenParams).versionSince >= 0x0000_000004_000004)
 
     override fun getDone(loadscreen: LoadScreenBase?) {
         loadscreen?.let {
@@ -223,7 +223,7 @@ class Terragen(world: GameWorld, isFinal: Boolean, val groundScalingCached: Modu
 abstract class TerragenParams {
     val LANDBLOCK_VAR_COUNTS = 16
 
-    abstract val version: Long
+    abstract val versionSince: Long
     abstract val strata: List<Stratum>
     abstract val featureSize: Double
     abstract val lowlandScaleOffset: Double // linearly alters the height
@@ -297,12 +297,15 @@ abstract class TerragenParams {
  * @param h: STARTING height of the strata relative to the ground select gradient
  * @param v: linear ± to the `h`
  */
-data class Hv(val h: Double, val v: Double)
+data class Hv(val h: Double, val v: Double) { init {
+    if (h.isNaN() || h.isInfinite() || h < 0.0) throw IllegalArgumentException("h-value must be zero or positive (got $h)")
+    if (v.isNaN() || v.isInfinite() || v < 0.0) throw IllegalArgumentException("v-value must be zero or positive (got $v)")
+} }
 class Stratum(val yheight: Hv, vararg val tiles: ItemID)
 class StratumObj(val yheight: Double, val tiles: ItemID)
 
 data class TerragenParamsAlpha1(
-    override val version: Long = 0L,
+    override val versionSince: Long = 0L,
 
     // 0. randomiser gets two-element buffer
     // 1. randomiser consults the buffer and removes matching elements from the random pool
@@ -340,7 +343,7 @@ data class TerragenParamsAlpha1(
     ) : TerragenParams()
 
 data class TerragenParamsAlpha2(
-    override val version: Long = 0x0000_000004_000004,
+    override val versionSince: Long = 0x0000_000004_000004,
 
     override val strata: List<Stratum> = listOf(
         Stratum(Hv(.0, .0), Block.AIR),
@@ -396,4 +399,4 @@ data class TerragenParamsAlpha2(
 
     override val landBlockScale: Double = 0.5,
 
-) : TerragenParams()
\ No newline at end of file
+    ) : TerragenParams()
\ No newline at end of file
diff --git a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Worldgen.kt b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Worldgen.kt
index 371d53dbf..cae35b139 100644
--- a/src/net/torvald/terrarum/modulebasegame/worldgenerator/Worldgen.kt
+++ b/src/net/torvald/terrarum/modulebasegame/worldgenerator/Worldgen.kt
@@ -98,7 +98,7 @@ object Worldgen {
             Work(Lang["MENU_IO_WORLDGEN_RETICULATING_SPLINES"], Terragen(world, false, groundScalingCached, params.seed, params.terragenParams), listOf("TERRAIN")), // also generates marble veins
             Work(Lang["MENU_IO_WORLDGEN_CARVING_EARTH"], Cavegen(world, false, highlandLowlandSelectCache, params.seed, params.terragenParams), listOf("TERRAIN", "CAVE")),
             Work(Lang["MENU_IO_WORLDGEN_FLOODING_UNDERGROUND"], Aquagen(world, false, groundScalingCached, params.seed, params.terragenParams), listOf("WATER")),
-            Work(Lang["MENU_IO_WORLDGEN_GROWING_MINERALS"], Oregen(world, false, caveAttenuateBiasScaledForOresCache, params.seed, oreRegistry), listOf("ORES")),
+            Work(Lang["MENU_IO_WORLDGEN_GROWING_MINERALS"], Oregen(world, false, caveAttenuateBiasScaledForOresCache, params.seed, oreRegistry, params.terragenParams), listOf("ORES")),
             Work(Lang["MENU_IO_WORLDGEN_POSITIONING_ROCKS"], OregenAutotiling(world, false, params.seed, oreTilingModes), listOf("ORES")),
             // TODO generate gemstones
             Work(Lang["MENU_IO_WORLDGEN_PAINTING_GREEN"], Biomegen(world, false, params.seed, params.biomegenParams, biomeMap), listOf("BIOME")),