- Improved UX for transforming selected points together via Shift key

- Selected points can now be transformed together in 2 ways: in the same direction or in opposite directions (toggle with C key)
- Added "Preserve Shape" option to "Insert Point Before" and "Insert Point After" actions (spline's shape will be preserved but if neighboring end points' Handle Modes are set to Mirrored, they will be changed to Aligned)
- Added "Show Control Points" option to spline's Inspector to hide the control points completely, if desired

Author: yasirkula

Plugins/BezierSolution/BezierSpline.cs

@@ -56,19 +56,9 @@ public int gizmoSmoothness
 #endif
 
 		public int Count { get { return endPoints.Count; } }
-		public float Length { get { return GetLengthApproximately( 0f, 1f ); } }
+		public BezierPoint this[int index] { get { return endPoints[index]; } }
 
-		public BezierPoint this[int index]
-		{
-			get
-			{
-				if( index < Count )
-					return endPoints[index];
-
-				Debug.LogError( "Bezier index " + index + " is out of range: " + Count );
-				return null;
-			}
-		}
+		public float Length { get { return GetLengthApproximately( 0f, 1f ); } }
 
 		private void Awake()
 		{
@@ -157,7 +147,7 @@ public BezierPoint InsertNewPointAt( int index )
 			point.transform.SetParent( parent, false );
 			point.transform.SetSiblingIndex( siblingIndex );
 
-			if( endPoints.Count == prevCount ) // If spline is not automatically Refresh()'ed
+			if( endPoints.Count == prevCount ) // If spline isn't automatically Refresh()'ed
 				endPoints.Insert( index, point );
 
 			return point;
@@ -564,9 +554,7 @@ public void AutoConstructSpline()
 				rhs = new Vector3[n];
 
 			for( int i = 1; i < n - 1; i++ )
-			{
 				rhs[i] = 4 * endPoints[i].position + 2 * endPoints[i + 1].position;
-			}
 
 			rhs[0] = endPoints[0].position + 2 * endPoints[1].position;
 
@@ -579,17 +567,30 @@ public void AutoConstructSpline()
 			}
 
 			// Get first control points
-			Vector3[] controlPoints = GetFirstControlPoints( rhs );
+			int rhsLength = rhs.Length;
+			Vector3[] controlPoints = new Vector3[rhsLength]; // Solution vector
+			float[] tmp = new float[rhsLength]; // Temp workspace
+
+			float b = 2f;
+			controlPoints[0] = rhs[0] / b;
+			for( int i = 1; i < rhsLength; i++ ) // Decomposition and forward substitution
+			{
+				float val = 1f / b;
+				tmp[i] = val;
+				b = ( i < rhsLength - 1 ? 4f : 3.5f ) - val;
+				controlPoints[i] = ( rhs[i] - controlPoints[i - 1] ) / b;
+			}
+
+			for( int i = 1; i < rhsLength; i++ )
+				controlPoints[rhsLength - i - 1] -= tmp[rhsLength - i] * controlPoints[rhsLength - i]; // Backsubstitution
 
 			for( int i = 0; i < n; i++ )
 			{
 				// First control point
 				endPoints[i].followingControlPointPosition = controlPoints[i];
 
 				if( loop )
-				{
 					endPoints[i + 1].precedingControlPointPosition = 2 * endPoints[i + 1].position - controlPoints[i + 1];
-				}
 				else
 				{
 					// Second control point
@@ -609,32 +610,6 @@ public void AutoConstructSpline()
 			}
 		}
 
-		private static Vector3[] GetFirstControlPoints( Vector3[] rhs )
-		{
-			// Credit: http://www.codeproject.com/Articles/31859/Draw-a-Smooth-Curve-through-a-Set-of-2D-Points-wit
-
-			int n = rhs.Length;
-			Vector3[] x = new Vector3[n]; // Solution vector.
-			float[] tmp = new float[n]; // Temp workspace.
-
-			float b = 2f;
-			x[0] = rhs[0] / b;
-			for( int i = 1; i < n; i++ ) // Decomposition and forward substitution.
-			{
-				float val = 1f / b;
-				tmp[i] = val;
-				b = ( i < n - 1 ? 4f : 3.5f ) - val;
-				x[i] = ( rhs[i] - x[i - 1] ) / b;
-			}
-
-			for( int i = 1; i < n; i++ )
-			{
-				x[n - i - 1] -= tmp[n - i] * x[n - i]; // Backsubstitution.
-			}
-
-			return x;
-		}
-
 		public void AutoConstructSpline2()
 		{
 			// Credit: http://stackoverflow.com/questions/3526940/how-to-create-a-cubic-bezier-curve-when-given-n-points-in-3d
@@ -651,9 +626,7 @@ public void AutoConstructSpline2()
 						pMinus1 = endPoints[0].position;
 				}
 				else
-				{
 					pMinus1 = endPoints[i - 1].position;
-				}
 
 				if( loop )
 				{
@@ -689,11 +662,6 @@ public void AutoConstructSpline2()
 			}
 		}
 
-		/*public void AutoConstructSpline3()
-		{
-			// Todo? http://www.math.ucla.edu/~baker/149.1.02w/handouts/dd_splines.pdf
-		}*/
-
 		private float AccuracyToStepSize( float accuracy )
 		{
 			if( accuracy <= 0f )