Added cap to tube

Assets/Swarm/Shader/Tube.shader

@@ -56,6 +56,7 @@
             const float radius = 0.01;
 
             float phi = v.vertex.x; // Angle in slice
+            float cap = v.vertex.y; // -1:head, +1:tail
             float seg = v.vertex.z; // Segment index
             uint iseg = (uint)seg;
 
@@ -75,8 +76,8 @@
             float3 normal = n * cos(phi) + b * sin(phi); // Surface normal
 
             // Feedback the results.
-            v.vertex = float4(p + normal * radius, 1);
-            v.normal = normal;
+            v.vertex = float4(p + normal * radius * (1 - abs(cap)), 1);
+            v.normal = normal * (1 - abs(cap)) + n * cap;
             v.color = param;
 
             #endif

Assets/Swarm/TubeTemplate.cs

@@ -44,36 +44,78 @@ public void Rebuild()
             // Vertex array
             var vertices = new List<Vector3>();
 
+            // Head tip
+            vertices.Add(new Vector3(0, -1, 0));
+
+            // Tube body vertices
             for (var i = 0; i < _segments + 1; i++)
             {
-                for (var j = 0; j < _divisions + 1; j++)
+                for (var j = 0; j < _divisions; j++)
                 {
                     var phi = Mathf.PI * 2 * j / _divisions;
                     vertices.Add(new Vector3(phi, 0, i));
                 }
             }
 
+            // Tail tip
+            vertices.Add(new Vector3(0, 1, _segments)); // tail
+
             // Index array
             var indices = new List<int>();
-            var refi = 0;
+
+            // Head cap
+            for (var i = 0; i < _divisions - 1; i++)
+            {
+                indices.Add(0);
+                indices.Add(i + 2);
+                indices.Add(i + 1);
+            }
+
+            indices.Add(0);
+            indices.Add(1);
+            indices.Add(_divisions);
+
+            // Tube body indices
+            var refi = 1;
 
             for (var i = 0; i < _segments; i++)
             {
-                for (var j = 0; j < _divisions; j++)
+                for (var j = 0; j < _divisions - 1; j++)
                 {
                     indices.Add(refi);
                     indices.Add(refi + 1);
-                    indices.Add(refi + 1 + _divisions);
+                    indices.Add(refi + _divisions);
 
                     indices.Add(refi + 1);
-                    indices.Add(refi + 2 + _divisions);
                     indices.Add(refi + 1 + _divisions);
+                    indices.Add(refi + _divisions);
 
                     refi++;
                 }
+
+                indices.Add(refi);
+                indices.Add(refi + 1 - _divisions);
+                indices.Add(refi + _divisions);
+
+                indices.Add(refi + 1 - _divisions);
+                indices.Add(refi + 1);
+                indices.Add(refi + _divisions);
+
                 refi++;
             }
 
+            // Tail cap
+            for (var i = 0; i < _divisions - 1; i++)
+            {
+                indices.Add(refi + i);
+                indices.Add(refi + i + 1);
+                indices.Add(refi + _divisions);
+            }
+
+            indices.Add(refi + _divisions - 1);
+            indices.Add(refi);
+            indices.Add(refi + _divisions);
+
             // Mesh rebuilding
             _mesh.Clear();
             _mesh.SetVertices(vertices);

Assets/Test/Test.unity

@@ -354,7 +354,7 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   _instanceCount: 4000
-  _template: {fileID: 11400000, guid: 14bd2a077b97cb042ac835ef28e4add9, type: 2}
+  _template: {fileID: 11400000, guid: 407b7afb8fbe855408cc9bf4dd39058a, type: 2}
   _material: {fileID: 2100000, guid: b3e3f432bd29ac1499686dbad7ae39ef, type: 2}
   _gradient: {fileID: 11400000, guid: 202a0875a5bc2554a932e60d8ed7e7ec, type: 2}
   _volume: {fileID: 11400000, guid: 33827603f26d861438dab734dfca23e1, type: 2}