another wip

src/net/torvald/terrarum/gameactors/ActorWithBody.kt

@@ -481,7 +481,7 @@ open class ActorWithBody : Actor {
      * @param acc acceleration in Vector2, the unit is [px / InternalFrame^2]
      */
     fun applyAcceleration(acc: Vector2) {
-        externalV += acc * speedMultByTile
+        externalV += acc
     }
 
     private fun Vector2.applyViscoseDrag() {
@@ -584,11 +584,11 @@ open class ActorWithBody : Actor {
 //                    printdbg(this, "BodyViscosity=$bodyViscosity   FeetViscosity=$feetViscosity   BodyFriction=$bodyFriction   FeetFriction=$feetFriction")
 //                }
 
-                externalV.applyViscoseDrag()
+//                externalV.applyViscoseDrag()
 
-//                controllerV?.let {
-//                    it.applyViscoseDrag()
-//                }
+                controllerV?.let {
+                    it.applyViscoseDrag()
+                }
 
                 val vecSum = (externalV + (controllerV ?: Vector2(0.0, 0.0)))
                 /**
@@ -653,7 +653,7 @@ open class ActorWithBody : Actor {
 
             // --> Apply more forces <-- //
             // Actors are subject to the gravity and the buoyancy if they are not levitating
-            val buoyancy = applyBuoyancy() * speedMultByTile
+            val buoyancy = applyBuoyancy()
             if (!isNoSubjectToGrav) {
                 hitbox.translate(buoyancy)
                 clampHitbox()
@@ -1681,11 +1681,11 @@ open class ActorWithBody : Actor {
         if (world == null) return Vector2()
 
         val rho = tileDensityFluid // kg / m^3
-        // V = submergedHeight in meters * f(object density)
-        val V = mass * density // m^3
+        val V_full = mass / density // density = mass / volume, simply rearrange this
+        val V = V_full * submergedRatio
         val g = world!!.gravitation // m / s^2
         val F_k = g * mass // Newtons = kg * m / s^2
-        val F_bo = (g * mass) * (rho / density) * submergedRatio
+        val F_bo = g * (rho * V) // Newtons
 
         // mh'' = mg - rho*gv
         // h'' = (mg - rho*gv) / m

src/net/torvald/terrarum/modulebasegame/IngameRenderer.kt

@@ -866,7 +866,6 @@ object IngameRenderer : Disposable {
     }
 
     private val bodyFriction = BlockCodex[Block.AIR].friction.frictionToMult()
-    private val bodyViscosity = FluidCodex[Block.AIR].viscosity.viscosityToMult()
 
 
     private fun applyGravitation(gravitation: Vector2, hitboxWidth: Double) {
@@ -877,8 +876,7 @@ object IngameRenderer : Disposable {
     private fun Int.viscosityToMult(): Double = 16.0 / (16.0 + this)
 
     private fun applyForce(acc: Vector2) {
-        val speedMultByTile = bodyViscosity
-        externalV += acc * speedMultByTile
+        externalV += acc
     }
 
     private fun getDrag(externalForce: Vector2, gravitation: Vector2, hitboxWidth: Double): Vector2 {

src/net/torvald/terrarum/modulebasegame/gameactors/ActorHumanoid.kt

@@ -499,7 +499,7 @@ open class ActorHumanoid : ActorWithBody, Controllable, Pocketed, Factionable, L
         else {
             isWalkingH = true
 
-            readonly_totalX =
+            readonly_totalX = speedMultByTile *
                 if (absAxisVal == AXIS_KEYBOARD)
                     avAcceleration * applyVelo(walkCounterX) * (if (left) -1f else 1f)
                 else