重新导入obi

Assets/Obi/Scripts/Common/Utils/Forces/ObiAmbientForceZone.cs

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+using UnityEngine;
+using System;
+
+namespace Obi
+{
+	public class ObiAmbientForceZone : ObiExternalForce
+	{
+
+		public override void ApplyForcesToActor(ObiActor actor)
+        {
+
+			Matrix4x4 l2sTransform = actor.solver.transform.worldToLocalMatrix * transform.localToWorldMatrix;
+			
+			Vector4 force = l2sTransform.MultiplyVector(Vector3.forward * (intensity + GetTurbulence(turbulence)));
+
+			if (actor.usesCustomExternalForces)
+            {
+                for (int i = 0; i < actor.activeParticleCount; ++i)
+                    actor.solver.wind[actor.solverIndices[i]] += force;
+			}
+            else
+            {
+                for (int i = 0; i < actor.activeParticleCount; ++i)
+					actor.solver.externalForces[actor.solverIndices[i]] += force;	
+			}
+		}
+
+		public void OnDrawGizmosSelected()
+        {
+
+			Gizmos.matrix = transform.localToWorldMatrix;
+			Gizmos.color = new Color(0,0.7f,1,1);
+
+			// arrow body:
+			ObiUtils.DrawArrowGizmo(0.5f + GetTurbulence(1),0.2f,0.3f,0.2f);
+		}
+	}
+}
+

Assets/Obi/Scripts/Common/Utils/Forces/ObiAmbientForceZone.cs.meta

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Assets/Obi/Scripts/Common/Utils/Forces/ObiExternalForce.cs

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+using UnityEngine;
+using System;
+
+namespace Obi
+{
+	public abstract class ObiExternalForce : MonoBehaviour
+	{
+
+		public float intensity = 0;
+		public float turbulence = 0;
+		public float turbulenceFrequency = 1;
+		public float turbulenceSeed = 0;
+		public ObiSolver[] affectedSolvers;
+
+		public void OnEnable()
+		{
+            foreach (ObiSolver solver in affectedSolvers)
+            {
+                if (solver != null)
+                    solver.OnBeginStep += Solver_OnStepBegin;
+            }
+		}
+
+		public void OnDisable()
+		{
+            foreach (ObiSolver solver in affectedSolvers)
+            {
+                if (solver != null)
+                    solver.OnBeginStep -= Solver_OnStepBegin;
+            }
+		}
+
+        void Solver_OnStepBegin(ObiSolver solver, float stepTime)
+        {
+            foreach (ObiActor actor in solver.actors)
+            {
+                if (actor != null)
+                    ApplyForcesToActor(actor);
+            }
+        }
+
+		protected float GetTurbulence(float turbulenceIntensity){
+			return Mathf.PerlinNoise(Time.fixedTime * turbulenceFrequency,turbulenceSeed) * turbulenceIntensity;
+		}
+
+		public abstract void ApplyForcesToActor(ObiActor actor);	
+		
+	}
+}
+

Assets/Obi/Scripts/Common/Utils/Forces/ObiExternalForce.cs.meta

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Assets/Obi/Scripts/Common/Utils/Forces/ObiSphericalForceZone.cs

@@ -0,0 +1,63 @@
+using UnityEngine;
+using System;
+
+namespace Obi
+{
+	public class ObiSphericalForceZone : ObiExternalForce
+	{
+
+		public float radius = 5;
+		public bool radial = true;
+
+		public override void ApplyForcesToActor(ObiActor actor)
+        {
+
+			float sqrRadius = radius * radius;
+			float finalIntensity = intensity + GetTurbulence(turbulence);
+
+			Matrix4x4 l2sTransform = actor.solver.transform.worldToLocalMatrix * transform.localToWorldMatrix;
+
+			Vector4 center = l2sTransform.MultiplyPoint3x4(Vector4.zero);
+			Vector4 forward = l2sTransform.MultiplyVector(Vector3.forward);
+
+			// Calculate force intensity for each actor particle:
+            for (int i = 0; i < actor.activeParticleCount; ++i){
+
+				Vector4 distanceVector = actor.solver.positions[actor.solverIndices[i]] - center;
+
+				float sqrMag = distanceVector.sqrMagnitude;
+				float falloff = Mathf.Clamp01((sqrRadius - sqrMag) / sqrRadius);
+
+				Vector4 force;
+				if (radial)
+					force = distanceVector/(Mathf.Sqrt(sqrMag) + float.Epsilon) * falloff * finalIntensity;
+				else
+					force = forward * falloff * finalIntensity;
+
+				if (actor.usesCustomExternalForces)
+					actor.solver.wind[actor.solverIndices[i]] += force;
+				else
+					actor.solver.externalForces[actor.solverIndices[i]] += force;	
+			}			
+
+		}
+
+		public void OnDrawGizmosSelected()
+        {
+			Gizmos.matrix = transform.localToWorldMatrix;
+			Gizmos.color = new Color(0,0.7f,1,1);
+			Gizmos.DrawWireSphere(Vector3.zero,radius);
+
+			float turb = GetTurbulence(1);
+
+			if (!radial){
+				ObiUtils.DrawArrowGizmo(radius + turb,radius*0.2f,radius*0.3f,radius*0.2f);
+			}else{
+				Gizmos.DrawLine(new Vector3(0,0,-radius*0.5f)*turb,new Vector3(0,0,radius*0.5f)*turb);
+				Gizmos.DrawLine(new Vector3(0,-radius*0.5f,0)*turb,new Vector3(0,radius*0.5f,0)*turb);
+				Gizmos.DrawLine(new Vector3(-radius*0.5f,0,0)*turb,new Vector3(radius*0.5f,0,0)*turb);
+			}
+		}
+	}
+}
+

Assets/Obi/Scripts/Common/Utils/Forces/ObiSphericalForceZone.cs.meta

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