High speed

BepInEx5Plugins.Ash.Alisa.Stairs/BepInEx5Plugins.Ash.Alisa.Stairs.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net35</TargetFramework>
+    <AssemblyName>BepInEx5Plugins.Ash.Alisa.Stairs</AssemblyName>
+    <Description>Stairs</Description>
+    <Version>1.0.0</Version>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <LangVersion>9.0</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BepInEx.Analyzers" Version="1.*" PrivateAssets="all" />
+    <PackageReference Include="BepInEx.Core" Version="5.*" />
+    <PackageReference Include="BepInEx.PluginInfoProps" Version="1.*" />
+    <PackageReference Include="UnityEngine.Modules" Version="5.6.7" IncludeAssets="compile" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework.TrimEnd(`0123456789`))' == 'net'">
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="all" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="Assembly-CSharp">
+      <HintPath>..\lib\SteamRelease\Assembly-CSharp.dll</HintPath>
+      <Private>false</Private>
+    </Reference>
+  </ItemGroup>
+
+  <Target Name="PostBuild" AfterTargets="PostBuildEvent">
+    <Exec Command="xcopy /Y /Q /C /I &quot;$(OutDir)&quot; &quot;..\$(OutDir)\$(TargetName)\&quot;" />
+  </Target>
+</Project>

BepInEx5Plugins.Ash.Alisa.Stairs/HarmonyPatches/Interaction_FixedUpdate.cs

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+using HarmonyLib;
+using System;
+using UnityEngine;
+
+namespace BepInEx5Plugins.Ash.Alisa.Stairs.HarmonyPatches
+{
+	[HarmonyPatch(typeof(Interaction), "FixedUpdate")]
+	public class Interaction_FixedUpdate
+	{
+		public static float stairsWalkSpeed = 2f;
+
+		public static bool ignoreAnimation = false;
+
+		public static bool newGamePlusOnly = false;
+
+		// Add speed modifier when moving on stairs.
+		private static bool Prefix(Interaction __instance, ref float? __state
+			, ref GameObject ___player
+			, ref bool ___playerMovingDown
+			, ref bool ___playerMovingUp
+			, ref Animator ___anim
+			)
+		{
+			__state = null;
+
+			if (newGamePlusOnly
+				&& ProgressManager.instance.data.newGamePlus < 1)
+			{
+				return true;
+			}
+
+			try
+			{
+				___anim.SetBool("WalkingDownStairs", ___playerMovingDown);
+				___anim.SetBool("WalkingUpStairs", ___playerMovingUp);
+
+				if (!ignoreAnimation)
+				{
+					__state = ___anim.speed;
+				}
+
+				if (___playerMovingDown)
+				{
+					if (!ignoreAnimation)
+					{
+						__state = stairsWalkSpeed;
+					}
+					___player.transform.Translate(stairsWalkSpeed * Vector3.forward * 0.7f * Time.fixedDeltaTime);
+					___player.transform.Translate(stairsWalkSpeed * Vector3.down * 0.475f * Time.fixedDeltaTime);
+					___player.GetComponent<Rigidbody>().velocity = Vector3.zero;
+				}
+
+				if (___playerMovingUp)
+				{
+					if (!ignoreAnimation)
+					{
+						__state = stairsWalkSpeed;
+					}
+					___player.transform.Translate(stairsWalkSpeed * Vector3.forward * 0.7f * Time.fixedDeltaTime);
+					___player.transform.Translate(stairsWalkSpeed * Vector3.up * 0.48f * Time.fixedDeltaTime);
+					___player.GetComponent<Rigidbody>().velocity = Vector3.zero;
+				}
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine(ex);
+			}
+
+			return false;
+		}
+
+		// Modify the animation speed if necessary.
+		private static void Postfix(Interaction __instance, ref float? __state
+			, ref Animator ___anim
+			)
+		{
+			try
+			{
+				__state = null;
+
+				if (__state.HasValue)
+				{
+					___anim.speed = __state.Value;
+				}
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine(ex);
+			}
+		}
+	}
+}

BepInEx5Plugins.Ash.Alisa.Stairs/NuGet.Config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="BepInEx" value="https://nuget.bepinex.dev/v3/index.json" />
+  </packageSources>
+</configuration>

BepInEx5Plugins.Ash.Alisa.Stairs/Plugin.cs

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+using BepInEx;
+using BepInEx.Configuration;
+using HarmonyLib;
+using System;
+
+namespace BepInEx5Plugins.Ash.Alisa.Stairs
+{
+	[BepInPlugin(PluginInfo.PLUGIN_GUID, PluginInfo.PLUGIN_NAME, PluginInfo.PLUGIN_VERSION)]
+	public class Plugin : BaseUnityPlugin
+	{
+		private static ConfigEntry<bool> ignoreAnimation;
+
+		private static ConfigEntry<bool> newGamePlusOnly;
+
+		private static ConfigEntry<float> stairsWalkSpeed;
+
+		private Plugin()
+		{
+			try
+			{
+				stairsWalkSpeed = Config.Bind("Stairs", "Walk Speed", 2f);
+				ignoreAnimation = Config.Bind("Stairs", "Ignore Animation", false);
+				newGamePlusOnly = Config.Bind("Stairs", "New Game Plus Only", false);
+
+				Config.SettingChanged += Config_SettingChanged;
+
+				ApplySettings();
+			}
+			catch (Exception exception)
+			{
+				Console.WriteLine(exception);
+			}
+		}
+
+		private static void Config_SettingChanged(object sender, EventArgs e)
+		{
+			ApplySettings();
+		}
+
+		private static void ApplySettings()
+		{
+			HarmonyPatches.Interaction_FixedUpdate.stairsWalkSpeed = stairsWalkSpeed.Value;
+			HarmonyPatches.Interaction_FixedUpdate.ignoreAnimation = ignoreAnimation.Value;
+			HarmonyPatches.Interaction_FixedUpdate.newGamePlusOnly = newGamePlusOnly.Value;
+		}
+
+		private void Awake()
+		{
+			try
+			{
+				Logger.LogInfo($"Plugin {PluginInfo.PLUGIN_GUID} is loaded!");
+
+				var harmony = new Harmony(Info.Metadata.GUID);
+
+				harmony.PatchAll();
+			}
+			catch (Exception exception)
+			{
+				Console.WriteLine(exception);
+			}
+		}
+	}
+}