(61d00a474) v0.9.7.1

2020-03-04 13:04:10 +01:00
parent 3c50efa5c9
commit 3c09ebe02f
5086 changed files with 786063 additions and 295871 deletions
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+/* Original source Farseer Physics Engine:
+ * Copyright (c) 2014 Ian Qvist, http://farseerphysics.codeplex.com
+ * Microsoft Permissive License (Ms-PL) v1.1
+ */
+
+using Microsoft.Xna.Framework;
+
+namespace FarseerPhysics.Fluids
+{
+    /// <summary>
+    /// Fluid parameters, see pvfs.pdf for a detailed explanation
+    /// </summary>
+    public struct FluidDefinition
+    {
+        /// <summary>
+        /// Distance of influence between the particles
+        /// </summary>
+        public float InfluenceRadius;
+
+        /// <summary>
+        /// Density of the fluid
+        /// </summary>
+        public float DensityRest;
+
+        /// <summary>
+        /// Stiffness of the fluid (when particles are far)
+        /// </summary>
+        public float Stiffness;
+
+        /// <summary>
+        /// Stiffness of the fluid (when particles are near)
+        /// Set by Check()
+        /// </summary>
+        public float StiffnessNear;
+
+        /// <summary>
+        /// Toggles viscosity forces
+        /// </summary>
+        public bool UseViscosity;
+
+        /// <summary>
+        /// See pvfs.pdf for more information
+        /// </summary>
+        public float ViscositySigma;
+
+        /// <summary>
+        /// See pvfs.pdf for more information
+        /// </summary>
+        public float ViscosityBeta;
+
+        /// <summary>
+        /// Toggles plasticity computation (springs etc.)
+        /// </summary>
+        public bool UsePlasticity;
+
+        /// <summary>
+        /// Plasticity, amount of memory of the shape
+        /// See pvfs.pdf for more information
+        /// </summary>
+        public float Plasticity;
+
+        /// <summary>
+        /// K of the springs used for plasticity
+        /// </summary>
+        public float KSpring;
+
+        /// <summary>
+        /// Amount of change of the rest length of the springs (when compressed)
+        /// </summary>
+        public float YieldRatioCompress;
+
+        /// <summary>
+        /// Amount of change of the rest length of the springs (when stretched)
+        /// </summary>
+        public float YieldRatioStretch;
+
+        public static FluidDefinition Default
+        {
+            get
+            {
+                FluidDefinition def = new FluidDefinition
+                                          {
+                                              InfluenceRadius = 1.0f,
+                                              DensityRest = 10.0f,
+                                              Stiffness = 10.0f,
+                                              StiffnessNear = 0.0f, // Set by Check()
+
+                                              UseViscosity = false,
+                                              ViscositySigma = 10.0f,
+                                              ViscosityBeta = 0.0f,
+
+                                              UsePlasticity = false,
+                                              Plasticity = 0.3f,
+                                              KSpring = 2.0f,
+                                              YieldRatioCompress = 0.1f,
+                                              YieldRatioStretch = 0.1f
+                                          };
+
+                def.Check();
+
+                return def;
+            }
+        }
+
+        public void Check()
+        {
+            InfluenceRadius = MathHelper.Clamp(InfluenceRadius, 0.1f, 10.0f);
+            DensityRest = MathHelper.Clamp(DensityRest, 1.0f, 100.0f);
+            Stiffness = MathHelper.Clamp(Stiffness, 0.1f, 10.0f);
+            StiffnessNear = Stiffness * 100.0f; // See pvfs.pdf
+
+            ViscositySigma = MathHelper.Max(ViscositySigma, 0.0f);
+            ViscosityBeta = MathHelper.Max(ViscosityBeta, 0.0f);
+
+            Plasticity = MathHelper.Max(Plasticity, 0.0f);
+            KSpring = MathHelper.Max(KSpring, 0.0f);
+            YieldRatioCompress = MathHelper.Max(YieldRatioCompress, 0.0f);
+            YieldRatioStretch = MathHelper.Max(YieldRatioStretch, 0.0f);
+        }
+    }
+}