C# CRSpline类代码示例

 void Awake()
 {
     // Allocate the various arrays here to avoid
     // allocations during the game loop.
     bandData = new float[Spectrum.N_BANDS];
     bandPoints = new Vector3[Spectrum.N_BANDS + 2];
     splinePoints = new Vector3[nPoints];
     colliderPoints = new Vector2[nPoints + 2];
     spline = new CRSpline(bandPoints);
 }

	// Use this for initialization
	void Start () 
	{
		Vector3[] drawPath = iTweenPath.GetPath("test path");

		spline = new CRSpline(drawPath);
		t = 0.0f;


		/*
		iTween.MoveTo(gameObject, 
			iTween.Hash(
				"path", iTweenPath.GetPath("test path"), 
				"looptype", "loop",
				"time", 10, 
				"movetopath", false
			));
		*/
	}

    void GenerateMoveToPathTargets()
    {
        Vector3[] suppliedPath;

        //create and store path points:
        if(tweenArguments["path"].GetType() == typeof(Vector3[])){
            Vector3[] temp = (Vector3[])tweenArguments["path"];
            //if only one point is supplied fall back to MoveTo's traditional use since we can't have a curve with one value:
            if(temp.Length==1){
                Debug.LogError("iTween Error: Attempting a path movement with MoveTo requires an array of more than 1 entry!");
                Dispose();
            }
            suppliedPath=new Vector3[temp.Length];
            Array.Copy(temp,suppliedPath, temp.Length);
        }else{
            Transform[] temp = (Transform[])tweenArguments["path"];
            //if only one point is supplied fall back to MoveTo's traditional use since we can't have a curve with one value:
            if(temp.Length==1){
                Debug.LogError("iTween Error: Attempting a path movement with MoveTo requires an array of more than 1 entry!");
                Dispose();
            }
            suppliedPath = new Vector3[temp.Length];
            for (int i = 0; i < temp.Length; i++) {
                suppliedPath[i]=temp[i].position;
            }
        }

        //do we need to plot a path to get to the beginning of the supplied path?
        bool plotStart;
        int offset;
        if(transform.position != suppliedPath[0]){
            if(!tweenArguments.Contains("movetopath") || (bool)tweenArguments["movetopath"]==true){
                plotStart=true;
                offset=3;
            }else{
                plotStart=false;
                offset=2;
            }
        }else{
            plotStart=false;
            offset=2;
        }

        //build calculated path:
        vector3s = new Vector3[suppliedPath.Length+offset];
        if(plotStart){
            vector3s[1]=transform.position;
            offset=2;
        }else{
            offset=1;
        }

        //populate calculate path;
        Array.Copy(suppliedPath,0,vector3s,offset,suppliedPath.Length);

        //populate start and end control points:
        //vector3s[0] = vector3s[1] - vector3s[2];
        vector3s[0] = vector3s[1] + (vector3s[1] - vector3s[2]);
        vector3s[vector3s.Length-1] = vector3s[vector3s.Length-2] + (vector3s[vector3s.Length-2] - vector3s[vector3s.Length-3]);

        //is this a closed, continuous loop? yes? well then so let's make a continuous Catmull-Rom spline!
        if(vector3s[1] == vector3s[vector3s.Length-2]){
            Vector3[] tmpLoopSpline = new Vector3[vector3s.Length];
            Array.Copy(vector3s,tmpLoopSpline,vector3s.Length);
            tmpLoopSpline[0]=tmpLoopSpline[tmpLoopSpline.Length-3];
            tmpLoopSpline[tmpLoopSpline.Length-1]=tmpLoopSpline[2];
            vector3s=new Vector3[tmpLoopSpline.Length];
            Array.Copy(tmpLoopSpline,vector3s,tmpLoopSpline.Length);
        }

        //create Catmull-Rom path:
        path = new CRSpline(vector3s);

        //need for speed?
        if(tweenArguments.Contains("speed")){
            float distance = PathLength(vector3s);
            time = distance/(float)tweenArguments["speed"];
        }
    }

	//Json文件加载
	private void JsonLoad(string path_name, CRSpline crSpline, ref bool is_right, Transform parent_trans)
	{
		string filePath = MotionPara.taskRootPath + MotionPara.taskName + "/PathControl.json";
		if (File.Exists(filePath))
		{
			JsonOperator jsonOp = new JsonOperator();
			DataTable jsonTable = jsonOp.JsonReader(filePath, path_name);
			if (jsonTable == null)
			{
				Debug.LogError(path_name + ", 该路径名称不存在！");
				return;
			}
			GameObject loadEmpty = new GameObject();
			loadEmpty.name = "JsonLoad_empty";
			loadEmpty.transform.parent = parent_trans;
			for (int i = 0; i < jsonTable.Rows.Count; i++)
			{
				loadEmpty.transform.localPosition = ConvertToVector3((string)jsonTable.Rows[i][0].ToString());
				loadEmpty.transform.localEulerAngles = ConvertToVector3((string)jsonTable.Rows[i][1].ToString());
				crSpline.controlPoints.Add(loadEmpty.transform.position);
				crSpline.rotationList.Add(loadEmpty.transform.eulerAngles);
				crSpline.cameraViewList.Add(float.Parse((string)jsonTable.Rows[i][2].ToString()));
			}
			GameObject.DestroyImmediate(loadEmpty);
		}
		else
		{
			Debug.LogError(filePath + ", 该文件不存在！");
		}
	}

	public void DistributeNodes()
	{
		int numNodes = path.Count;
		//if (numNodes<5) return;
		
		Vector3[] newpositions = new Vector3[numNodes];		
		Vector3[] positions = new Vector3[numNodes];		
		
		for(int i=0; i<positions.Length; i++)
		{
			if( path[i] != null )
				positions[i] = path[i].position;
		}
		
		CRSpline posSpline = new CRSpline( positions );		
			
		for (int a=1; a<positions.Length-1; a++)
		{
			float p = (1.0f / ((float)numNodes-3.0f)) * (a-1);
			//Debug.Log(p+","+getT( splineLenght*p ));
			newpositions[a] = posSpline.Interp(getT( splineLenght*p ));			
			
		}
		
		for (int a=1; a<positions.Length-1; a++)
			path[a].position = newpositions[a];
		
	}

	void generateMesh()
	{		
		if(meshPrefab==null)
			return;
		List<Vector3> vertices=new List<Vector3>();
		List<int>[] triangles=new List<int>[3];
		triangles[0]=new List<int>();
		triangles[1]=new List<int>();
		triangles[2]=new List<int>();
		List<Vector2> uv=new List<Vector2>();
		List<Vector3> normals=new List<Vector3>();
		List<Vector4> tangents=new List<Vector4>();
		
		CRSpline posSpline = new CRSpline( path.getPositions() );
		//CRSpline rotSpline = new CRSpline( path.getRotations() );
		
		Mesh[] mesh=new Mesh[3];
		mesh[0]=meshPrefab.FindChild("start").GetComponent<MeshFilter>().sharedMesh;
		mesh[1]=meshPrefab.FindChild("middle").GetComponent<MeshFilter>().sharedMesh;
		mesh[2]=meshPrefab.FindChild("end").GetComponent<MeshFilter>().sharedMesh;
		
		Vector3[][] meshVertices=new Vector3[3][];
		int[][] meshTriangles=new int[3][];
		Vector2[][] meshUv=new Vector2[3][];
		Vector3[][] meshNormals=new Vector3[3][];
		Vector4[][] meshTangents=new Vector4[3][];
		
		float[] max=new float[3];
		
		for(int i=0;i<3;i++)
		{
			meshVertices[i]=mesh[i].vertices;
			meshTriangles[i]=mesh[i].GetTriangles(0);
			meshUv[i]=mesh[i].uv;
			meshNormals[i]=mesh[i].normals;
			meshTangents[i]=mesh[i].tangents;
			
			for(int vi=0;vi<meshTriangles[i].Length;vi++)
			{
				if(meshVertices[i][meshTriangles[i][vi]].x>max[i])
					max[i]=meshVertices[i][meshTriangles[i][vi]].x;
			}
		}
		
		float cursor=0;
		int vertI=0;
		
		int meshI=0;
		if(path.round)
			meshI=1;
		bool last=false;
		//float scale=1;
		while(true)
		{
			if(meshI==2)
				break;
			if(getT(cursor+max[meshI])<1.0f || last)
			{
				if(last)
				{
					//scale=1.0f/(getT(cursor+max[meshI])-getT(cursor))*(1.0f-getT(cursor));
					
				}
				if(getT(cursor+max[meshI]+max[2])>1.0f && !path.round)
					meshI=2;
					
				for(int i=0;i<meshTriangles[meshI].Length;i++)
				{
					triangles[meshI].Add(vertI+meshTriangles[meshI][i]);
				}
				vertI+=mesh[meshI].vertexCount;
				
				for(int i=0;i<meshVertices[meshI].Length;i++)
				{
					float vertexCursor=cursor+Mathf.Max(meshVertices[meshI][i].x,0);
					float t=getT(vertexCursor);
					Vector3 vPos=posSpline.Interp(t);
					Vector3 look=posSpline.Velocity(t).normalized;
					
					Quaternion r=Quaternion.LookRotation(look);
					r=Quaternion.Euler(0,-90,0)*Quaternion.Euler(r.eulerAngles.z,(r.eulerAngles.y),-r.eulerAngles.x);
				
					Vector3 localVert=meshVertices[meshI][i];
					localVert.x=0;
					Vector3 vert=(r*localVert)+(vPos-transform.position);
					//vert.x-=middleVertices[i].x;
					
					//Debug.Log(t);
					vertices.Add(vert);
					
					uv.Add(meshUv[meshI][i]);
					normals.Add(r*meshNormals[meshI][i]);
					tangents.Add(r*meshTangents[meshI][i]);
				}
				//Debug.Log(max);
				cursor+=max[meshI];
				
				if(meshI==0)
					meshI=1;
					
//.........这里部分代码省略.........

	protected void easePath(  )
	{
		positionSpline = new CRSpline( path.getPositions() );
		rotationSpline = new CRSpline( path.getRotations() );
		
		float startI=(1.0f/(positionSpline.pts.Length-3))*(pathStartNode-1);
		float endI=(1.0f/(positionSpline.pts.Length-3))*(pathEndNode-1);
		
		float i=startI+ ((endI-startI)*normalizedTime);
		
		Vector3 newPos = positionSpline.Interp( i );
		if (transform==null)
		{
			Debug.Log("EasePath error: "+easingGroup + " " + animationCurveName);
			return;
		}
		if(space==Space.World)
			transform.position = newPos;
		else
			transform.localPosition = newPos;
		
		if( lookAtTransform!= null )
		{
			transform.LookAt( lookAtTransform, vectorUp );
		}
		else if( pathAlignWithSpeed )
		{
			Vector3 velVector = positionSpline.Velocity( i);
			if(space==Space.World)
				transform.rotation = Quaternion.LookRotation( velVector );
			else
				transform.localRotation = Quaternion.LookRotation( velVector );
		}
		else
		{
			Vector3 newRot = rotationSpline.Interp( i );
			if(space==Space.World)
				transform.rotation = Quaternion.Euler( newRot );
			else
				transform.localRotation = Quaternion.Euler( newRot );
		}	
		
	}