unity3d - How can i create a 2D 'curve' collider -

i'm trying search smart way create curves next 1 (using unity3d 2d part (without using mesh collider))) , didn't found one

any appreciated.

seeing last answer (removed) doesn't fit want. have made myself beziercollider2d using bezier curves between 2 points , edgecollider2d.

version 1

beziercollider2d.cs

using unityengine; using system.collections; using system.collections.generic;  [requirecomponent (typeof (edgecollider2d))] public class beziercollider2d : monobehaviour  {     public vector2 firstpoint;     public vector2 secondpoint;      public vector2 handlerfirstpoint;     public vector2 handlersecondpoint;      public int pointsquantity;     vector3 calculatebezierpoint(float t,vector3 p0,vector3 handlerp0,vector3 handlerp1,vector3 p1)    {        float u = 1.0f - t;        float tt = t * t;        float uu = u * u;        float uuu = uu * u;        float ttt = tt * t;         vector3 p = uuu * p0; //first term        p += 3f * uu * t * handlerp0; //second term        p += 3f * u * tt * handlerp1; //third term        p += ttt * p1; //fourth term         return p;     }      public vector2[] calculate2dpoints()     {         list<vector2> points = new list<vector2>();          points.add(firstpoint);         for(int i=1;i<pointsquantity;i++)         {             points.add(calculatebezierpoint((1f/pointsquantity)*i,firstpoint,handlerfirstpoint,handlersecondpoint,secondpoint));         }         points.add(secondpoint);          return points.toarray();    } 

}

beziercollider2deditor.cs

using unityengine; using unityeditor; using system.collections;  [customeditor(typeof(beziercollider2d))]  public class beziercollider2deditor : editor  {     beziercollider2d beziercollider;     edgecollider2d edgecollider;      int lastpointsquantity = 0;     vector2 lastfirstpoint = vector2.zero;     vector2 lasthandlerfirstpoint = vector2.zero;     vector2 lastsecondpoint = vector2.zero;     vector2 lasthandlersecondpoint = vector2.zero;      public override void oninspectorgui()      {         beziercollider = (beziercollider2d) target;          edgecollider = beziercollider.getcomponent<edgecollider2d>();          if (edgecollider != null)         {             beziercollider.pointsquantity = editorguilayout.intfield ("curve points",beziercollider.pointsquantity, guilayout.minwidth(100));             beziercollider.firstpoint = editorguilayout.vector2field ("first point",beziercollider.firstpoint, guilayout.minwidth(100));             beziercollider.handlerfirstpoint = editorguilayout.vector2field ("handler first point",beziercollider.handlerfirstpoint, guilayout.minwidth(100));             beziercollider.secondpoint = editorguilayout.vector2field ("second point",beziercollider.secondpoint, guilayout.minwidth(100));             beziercollider.handlersecondpoint = editorguilayout.vector2field ("handler secondpoint",beziercollider.handlersecondpoint, guilayout.minwidth(100));              editorutility.setdirty(beziercollider);              if (beziercollider.pointsquantity > 0  && !beziercollider.firstpoint.equals(beziercollider.secondpoint) &&                 (                     lastpointsquantity != beziercollider.pointsquantity ||                     lastfirstpoint != beziercollider.firstpoint ||                     lasthandlerfirstpoint != beziercollider.handlerfirstpoint ||                     lastsecondpoint != beziercollider.secondpoint ||                     lasthandlersecondpoint != beziercollider.handlersecondpoint                 ))             {                 edgecollider.points = beziercollider.calculate2dpoints();             }          }     } } 

sample:

version 2 (with visual handlers , hiden edge collider in inspector)

beziercollider2d.cs

using unityengine; using system.collections.generic;  [requirecomponent (typeof (edgecollider2d))] public class beziercollider2d : monobehaviour  {     public vector2 firstpoint;     public vector2 secondpoint;      public vector2 handlerfirstpoint;     public vector2 handlersecondpoint;      public int pointsquantity;      vector3 calculatebezierpoint(float t,vector3 p0,vector3 handlerp0,vector3 handlerp1,vector3 p1)     {         float u = 1.0f - t;         float tt = t * t;         float uu = u * u;         float uuu = uu * u;         float ttt = tt * t;          vector3 p = uuu * p0; //first term         p += 3f * uu * t * handlerp0; //second term         p += 3f * u * tt * handlerp1; //third term         p += ttt * p1; //fourth term          return p;     }      public vector2[] calculate2dpoints()     {         list<vector2> points = new list<vector2>();          points.add(firstpoint);         for(int i=1;i<pointsquantity;i++)         {             points.add(calculatebezierpoint((1f/pointsquantity)*i,firstpoint,handlerfirstpoint,handlersecondpoint,secondpoint));         }         points.add(secondpoint);          return points.toarray();     }  } 

beziercollider2deditor.cs

using unityengine; using unityeditor;  [customeditor(typeof(beziercollider2d))]  public class beziercollider2deditor : editor  {     beziercollider2d beziercollider;     edgecollider2d edgecollider;      int lastpointsquantity = 0;     vector2 lastfirstpoint = vector2.zero;     vector2 lasthandlerfirstpoint = vector2.zero;     vector2 lastsecondpoint = vector2.zero;     vector2 lasthandlersecondpoint = vector2.zero;      public override void oninspectorgui()      {         beziercollider = (beziercollider2d) target;          edgecollider = beziercollider.getcomponent<edgecollider2d>();          if (edgecollider.hideflags != hideflags.hideininspector)         {             edgecollider.hideflags = hideflags.hideininspector;         }          if (edgecollider != null)         {             beziercollider.pointsquantity = editorguilayout.intfield ("curve points",beziercollider.pointsquantity, guilayout.minwidth(100));             beziercollider.firstpoint = editorguilayout.vector2field ("first point",beziercollider.firstpoint, guilayout.minwidth(100));             beziercollider.handlerfirstpoint = editorguilayout.vector2field ("handler first point",beziercollider.handlerfirstpoint, guilayout.minwidth(100));             beziercollider.secondpoint = editorguilayout.vector2field ("second point",beziercollider.secondpoint, guilayout.minwidth(100));             beziercollider.handlersecondpoint = editorguilayout.vector2field ("handler secondpoint",beziercollider.handlersecondpoint, guilayout.minwidth(100));              editorutility.setdirty(beziercollider);              if (beziercollider.pointsquantity > 0  && !beziercollider.firstpoint.equals(beziercollider.secondpoint) &&                 (                     lastpointsquantity != beziercollider.pointsquantity ||                     lastfirstpoint != beziercollider.firstpoint ||                     lasthandlerfirstpoint != beziercollider.handlerfirstpoint ||                     lastsecondpoint != beziercollider.secondpoint ||                     lasthandlersecondpoint != beziercollider.handlersecondpoint                 ))             {                 lastpointsquantity = beziercollider.pointsquantity;                 lastfirstpoint = beziercollider.firstpoint;                 lasthandlerfirstpoint = beziercollider.handlerfirstpoint;                 lastsecondpoint = beziercollider.secondpoint;                 lasthandlersecondpoint = beziercollider.handlersecondpoint;                 edgecollider.points = beziercollider.calculate2dpoints();             }          }     }      void onscenegui ()      {         if (beziercollider != null)         {             handles.color = color.grey;              handles.drawline(beziercollider.transform.position+(vector3)beziercollider.handlerfirstpoint,beziercollider.transform.position+(vector3)beziercollider.firstpoint);             handles.drawline(beziercollider.transform.position+(vector3)beziercollider.handlersecondpoint,beziercollider.transform.position+(vector3)beziercollider.secondpoint);              beziercollider.firstpoint = handles.freemovehandle(beziercollider.transform.position+((vector3)beziercollider.firstpoint),quaternion.identity,0.04f*handleutility.gethandlesize(beziercollider.transform.position+((vector3)beziercollider.firstpoint)),vector3.zero,handles.dotcap) - beziercollider.transform.position;             beziercollider.secondpoint = handles.freemovehandle(beziercollider.transform.position+((vector3)beziercollider.secondpoint),quaternion.identity,0.04f*handleutility.gethandlesize(beziercollider.transform.position+((vector3)beziercollider.secondpoint)),vector3.zero,handles.dotcap) - beziercollider.transform.position;             beziercollider.handlerfirstpoint = handles.freemovehandle(beziercollider.transform.position+((vector3)beziercollider.handlerfirstpoint),quaternion.identity,0.04f*handleutility.gethandlesize(beziercollider.transform.position+((vector3)beziercollider.handlerfirstpoint)),vector3.zero,handles.dotcap) - beziercollider.transform.position;             beziercollider.handlersecondpoint = handles.freemovehandle(beziercollider.transform.position+((vector3)beziercollider.handlersecondpoint),quaternion.identity,0.04f*handleutility.gethandlesize(beziercollider.transform.position+((vector3)beziercollider.handlersecondpoint)),vector3.zero,handles.dotcap) - beziercollider.transform.position;              if (gui.changed)             {                 editorutility.setdirty (target);             }         }     }  } 

enjoy it.