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