[Code] Only need to test LengthSquared against ZeroTolerance for vectors to avoid square root calculation

sources/engine/Xenko.Graphics/Sprite3DBatch.cs

@@ -71,7 +71,7 @@ namespace Xenko.Graphics
                 throw new ArgumentNullException("texture");
 
             // Skip items with null size
-            if (elementSize.Length() < MathUtil.ZeroTolerance)
+            if (elementSize.LengthSquared() < MathUtil.ZeroTolerance)
                 return;
 
             // Calculate the information needed to draw.

sources/engine/Xenko.Graphics/SpriteFont.cs

@@ -269,7 +269,7 @@ namespace Xenko.Graphics
             var elementSize = new Vector2(
                 auxiliaryScaling.X * glyph.Subrect.Width / realVirtualResolutionRatio.X,
                 auxiliaryScaling.Y * glyph.Subrect.Height / realVirtualResolutionRatio.Y);
-            if (elementSize.Length() < MathUtil.ZeroTolerance) 
+            if (elementSize.LengthSquared() < MathUtil.ZeroTolerance) 
                 return;
 
             var xShift = x;

sources/engine/Xenko.Graphics/UIBatch.cs

@@ -215,7 +215,7 @@ namespace Xenko.Graphics
         public void DrawRectangle(ref Matrix worldMatrix, ref Vector3 elementSize, ref Color color, int depthBias)
         {
             // Skip items with null size
-            if (elementSize.Length() < MathUtil.ZeroTolerance)
+            if (elementSize.LengthSquared() < MathUtil.ZeroTolerance)
                 return;
 
             // Calculate the information needed to draw.
@@ -277,7 +277,7 @@ namespace Xenko.Graphics
         private void DrawCube(ref Matrix worldMatrix, ref Vector3 elementSize, ref Color color, int depthBias, bool isReverse)
         {
             // Skip items with null size
-            if (elementSize.Length() < MathUtil.ZeroTolerance)
+            if (elementSize.LengthSquared() < MathUtil.ZeroTolerance)
                 return;
 
             // Calculate the information needed to draw.
@@ -331,7 +331,7 @@ namespace Xenko.Graphics
             if (texture == null) throw new ArgumentNullException(nameof(texture));
 
             // Skip items with null size
-            if (elementSize.Length() < MathUtil.ZeroTolerance)
+            if (elementSize.LengthSquared() < MathUtil.ZeroTolerance)
                 return;
 
             // Calculate the information needed to draw.

sources/engine/Xenko.Physics/Shapes/StaticPlaneColliderShape.cs

@@ -40,7 +40,7 @@ namespace Xenko.Physics
             Matrix rotationMatrix;
             var oY = Vector3.Normalize(Normal);
             var oZ = Vector3.Cross(Vector3.UnitX, oY);
-            if (oZ.Length() > MathUtil.ZeroTolerance)
+            if (oZ.LengthSquared() > MathUtil.ZeroTolerance)
             {
                 oZ.Normalize();
                 var oX = Vector3.Cross(oY, oZ);