去掉obi，使用自写绳索

Assets/Obi/Editor/Common/Blueprints/Brushes/BrushModes/ObiFloatAddBrushMode.cs

@@ -1,36 +0,0 @@
-namespace Obi
-{
-    public class ObiFloatAddBrushMode : IObiBrushMode
-    {
-        ObiBlueprintFloatProperty property;
-
-        public ObiFloatAddBrushMode(ObiBlueprintFloatProperty property)
-        {
-            this.property = property;
-        }
-
-        public string name
-        {
-            get { return "Add"; }
-        }
-
-        public bool needsInputValue
-        {
-            get { return true; }
-        }
-
-        public void ApplyStamps(ObiBrushBase brush, bool modified)
-        {
-            for (int i = 0; i < brush.weights.Length; ++i)
-            {
-                if (!property.Masked(i) && brush.weights[i] > 0)
-                {
-                    float currentValue = property.Get(i);
-                    float delta = brush.weights[i] * brush.opacity * brush.speed * property.GetDefault();
-
-                    property.Set(i, currentValue + delta * (modified ? -1 : 1));
-                }
-            }
-        }
-    }
-}