diff --git a/Diamond/Buffers/Buffer.cs b/Diamond/Buffers/Buffer.cs
index aefe9be..1aa2ae9 100644
--- a/Diamond/Buffers/Buffer.cs
+++ b/Diamond/Buffers/Buffer.cs
@@ -8,6 +8,10 @@ using OpenTK.Graphics.OpenGL4;
 
 namespace Diamond.Buffers
 {
+    /// <summary>
+    /// Manages an OpenGL Buffer object
+    /// </summary>
+    /// <typeparam name="T">The type of data used for this buffer</typeparam>
     public class Buffer<T> : GLObject where T : struct
     {
         private readonly BufferWrap _buffer;
@@ -16,8 +20,15 @@ namespace Diamond.Buffers
 
         private readonly int _size;
 
+        /// <summary>
+        /// The target for this buffer; its type
+        /// </summary>
         public BufferTarget Target => _buffer.Target;
 
+        /// <summary>
+        /// The usage hint for this buffer. Use StaticDraw for one-time uploads to 
+        /// vertex buffers, and DynamicDraw for repeated uploads to vertex buffers.
+        /// </summary>
         public BufferUsageHint Usage
         {
             get => _buffer.Usage;
@@ -32,12 +43,31 @@ namespace Diamond.Buffers
             _vdi = VertexDataInfo.GetInfo<T>();
         }
 
+        /// <summary>
+        /// Upload data to this buffer
+        /// </summary>
+        /// <param name="data">The data to upload</param>
         public void Data(T[] data) => _buffer.Data(_size, data);
 
+        /// <summary>
+        /// Upload a range of data to this buffer
+        /// </summary>
+        /// <param name="offset">The range offset</param>
+        /// <param name="count">The range length</param>
+        /// <param name="data">The data to upload, offset and length apply to both this and the target</param>
         public void Data(int offset, int count, T[] data) => _buffer.SubData(_size, offset, count, data);
 
+        /// <summary>
+        /// Upload a range of data to this buffer
+        /// </summary>
+        /// <param name="data">The data to upload</param>
         public void Data(SubArray<T> data) => Data(data.Offset, data.Length, data.Array);
 
+        /// <summary>
+        /// Point this buffer to a program's vertex attributes. T must have [VertexDataAttribute], and all fields
+        /// of T must have [VertexPointerAttribute] to infer vertex pointer locations.
+        /// </summary>
+        /// <param name="program">The program to point this buffer to</param>
         public void PointTo(Program program)
         {
             if (_vdi == null)
@@ -60,6 +90,13 @@ namespace Diamond.Buffers
             ? $"Buffer<{typeof(T).Name}> {Target} ({Id})"
             : $"Buffer<{typeof(T).Name}> {Target} {Name} ({Id})";
 
+        /// <summary>
+        /// Create an empty buffer of this type
+        /// </summary>
+        /// <param name="target">The buffer target</param>
+        /// <param name="usage">The initial usage hint</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The buffer, or null if initialization failed</returns>
         internal static Buffer<T> Empty(BufferTarget target, BufferUsageHint usage, string name)
         {
             var wrapper = new BufferWrap(target, usage);
@@ -70,6 +107,14 @@ namespace Diamond.Buffers
             return service;
         }
 
+        /// <summary>
+        /// Create a buffer of this type and upload data
+        /// </summary>
+        /// <param name="data">The data to upload</param>
+        /// <param name="target">The buffer target</param>
+        /// <param name="usage">The initial usage hint</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The buffer, or null if initialization failed</returns>
         internal static Buffer<T> FromData(T[] data, BufferTarget target, BufferUsageHint usage, string name = null)
         {
             var service = Empty(target, usage, name);
@@ -80,11 +125,29 @@ namespace Diamond.Buffers
         }
     }
 
+    /// <summary>
+    /// Class for static Buffer operations and public factory methods
+    /// </summary>
     public static class Buffer
     {
+        /// <summary>
+        /// Create an empty buffer of this type
+        /// </summary>
+        /// <param name="target">The buffer target</param>
+        /// <param name="usage">The initial usage hint</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The buffer, or null if initialization failed</returns>
         public static Buffer<T> Empty<T>(BufferTarget target, BufferUsageHint usage = BufferUsageHint.StaticDraw,
             string name = null) where T : struct => Buffer<T>.Empty(target, usage, name);
 
+        /// <summary>
+        /// Create a buffer of this type and upload data
+        /// </summary>
+        /// <param name="data">The data to upload</param>
+        /// <param name="target">The buffer target</param>
+        /// <param name="usage">The initial usage hint</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The buffer, or null if initialization failed</returns>
         public static Buffer<T> FromData<T>(T[] data, BufferTarget target,
             BufferUsageHint usage = BufferUsageHint.StaticDraw,
             string name = null) where T : struct => Buffer<T>.FromData(data, target, usage, name);
diff --git a/Diamond/Diamond.csproj b/Diamond/Diamond.csproj
index 16be66b..a02a020 100644
--- a/Diamond/Diamond.csproj
+++ b/Diamond/Diamond.csproj
@@ -60,13 +60,12 @@
     <Compile Include="Util\SubArray.cs" />
     <Compile Include="Buffers\VertexDataAttribute.cs" />
     <Compile Include="Wrappers\Wrapper.cs" />
-    <Compile Include="Level\TileData.cs" />
+    <Compile Include="Util\TileData.cs" />
     <Compile Include="Util\Mesh.cs" />
     <Compile Include="Util\ObjVertex.cs" />
     <Compile Include="Shaders\Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Shaders\Shader.cs" />
-    <Compile Include="Shaders\ShaderException.cs" />
     <Compile Include="Textures\Texture.cs" />
     <Compile Include="Buffers\VertexPointerAttribute.cs" />
   </ItemGroup>
diff --git a/Diamond/GLObject.cs b/Diamond/GLObject.cs
index 7fce728..d784304 100644
--- a/Diamond/GLObject.cs
+++ b/Diamond/GLObject.cs
@@ -4,17 +4,33 @@ using NLog;
 
 namespace Diamond
 {
+    /// <summary>
+    /// Provide managed access to OpenGL objects
+    /// </summary>
     public abstract class GLObject : IDisposable
     {
+        /// <summary>
+        /// Logger for all GLObjects
+        /// </summary>
         protected static readonly Logger Logger = LogManager.GetLogger("GLObject");
 
-        private bool _disposed;
-
+        /// <summary>
+        /// Name of this GLObject used for identification
+        /// </summary>
         public string Name { get; protected set; } = "GLObject";
 
+        /// <summary>
+        /// Underlying managed wrapper to this OpenGL object
+        /// </summary>
         internal abstract Wrapper Wrapper { get; }
+
+        /// <summary>
+        /// The OpenGL name of this object
+        /// </summary>
         public int Id => Wrapper.Id;
 
+        #region IDisposable
+
         protected virtual void Dispose(bool disposing)
         {
             if (_disposed)
@@ -29,6 +45,10 @@ namespace Diamond
             _disposed = true;
         }
 
+        #region Implemented
+
+        private bool _disposed;
+
         public void Dispose()
         {
             Dispose(true);
@@ -39,5 +59,9 @@ namespace Diamond
         {
             Dispose(false);
         }
+
+        #endregion
+
+        #endregion
     }
 }
\ No newline at end of file
diff --git a/Diamond/Shaders/Program.cs b/Diamond/Shaders/Program.cs
index 23e5dae..90aad0a 100644
--- a/Diamond/Shaders/Program.cs
+++ b/Diamond/Shaders/Program.cs
@@ -6,14 +6,22 @@ using OpenTK.Graphics.OpenGL4;
 
 namespace Diamond.Shaders
 {
+    /// <summary>
+    /// Manages an OpenGL Program object
+    /// </summary>
     public class Program : GLObject
     {
         private readonly ProgramWrap _program;
         internal override Wrapper Wrapper => _program;
 
+        /// <summary>
+        /// The currently active program. Manually invoking glUseProgram will break this.
+        /// </summary>
         public static Program Current { get; private set; }
 
+        // keep a cache of uniform and attributes to prevent repeated queries
         private readonly Dictionary<string, int> _uniforms = new Dictionary<string, int>();
+
         private readonly Dictionary<string, int> _attributes = new Dictionary<string, int>();
 
         internal Program(ProgramWrap program, string name)
@@ -22,24 +30,42 @@ namespace Diamond.Shaders
             Name = name;
         }
 
+        // todo change these to not use int? - possibly use TryGet, or return negative value if not present
+
+        /// <summary>
+        /// Get the location of a uniform
+        /// </summary>
+        /// <param name="name">The name of the uniform</param>
+        /// <returns>The location, or no value if uniform not present</returns>
         public int? UniformLocation(string name)
         {
             if (_uniforms.ContainsKey(name)) return _uniforms[name];
             return null;
         }
 
+        /// <summary>
+        /// Get the location of an attribute
+        /// </summary>
+        /// <param name="name">The name of the attribute</param>
+        /// <returns>The location, or no value if attribute not present</returns>
         public int? AttributeLocation(string name)
         {
             if (_attributes.ContainsKey(name)) return _attributes[name];
             return null;
         }
 
+        /// <summary>
+        /// Use this Program to render. Also updates Program.Current
+        /// </summary>
         public void Use()
         {
             GL.UseProgram(Id);
             Current = this;
         }
 
+        /// <summary>
+        /// Use the default shader to render
+        /// </summary>
         //? Could create static Program instance which wraps the default shader
         // ie Shader.Default.Use()
         // would also allow sending arrays to the default attribs like gl_Vertex etc.
@@ -49,6 +75,10 @@ namespace Diamond.Shaders
             Current = null;
         }
 
+        /// <summary>
+        /// Helper method to try to link this program
+        /// </summary>
+        /// <returns></returns>
         private bool Link()
         {
             _uniforms.Clear();
@@ -68,6 +98,10 @@ namespace Diamond.Shaders
             return true;
         }
 
+        /// <summary>
+        /// Helper method to attach a shader to this program
+        /// </summary>
+        /// <param name="shader">The shader to attach</param>
         private void Attach(Shader shader)
         {
             _program.Attach((ShaderWrap) shader.Wrapper);
@@ -75,16 +109,23 @@ namespace Diamond.Shaders
 
         public override string ToString() => $"Program \'{Name}\' ({Id})";
 
-        protected override void Dispose(bool disposing)
-        {
-            base.Dispose(disposing);
-        }
-
         #region Factory Methods
 
+        /// <summary>
+        /// Create a program from compiled shaders
+        /// </summary>
+        /// <param name="name">The name of this GLObject</param>
+        /// <param name="shaders">The shaders to use in this program</param>
+        /// <returns>The linked program, or null if initialization failed</returns>
         public static Program FromShaders(string name, params Shader[] shaders) => FromShaders(name,
             (IEnumerable<Shader>) shaders);
 
+        /// <summary>
+        /// Create a program from compiled shaders
+        /// </summary>
+        /// <param name="name">The name of this GLObject</param>
+        /// <param name="shaders">The shaders to use in this program</param>
+        /// <returns>The linked program, or null if initialization failed</returns>
         public static Program FromShaders(string name, IEnumerable<Shader>shaders)
         {
             if (shaders == null)
@@ -110,9 +151,9 @@ namespace Diamond.Shaders
                 service.Attach(shader);
             }
 
-            service.Link();
+            var linked = service.Link();
 
-            if (!wrapper.Linked)
+            if (!linked)
             {
                 Logger.Warn("Failed to link {0}", service);
                 Logger.Debug("InfoLog for {0}", service);
@@ -125,9 +166,18 @@ namespace Diamond.Shaders
             return service;
         }
 
-
+        /// <summary>
+        /// Create a program from compiled shaders
+        /// </summary>
+        /// <param name="shaders">The shaders to use in this program</param>
+        /// <returns>The linked program, or null if initialization failed</returns>
         public static Program FromShaders(params Shader[] shaders) => FromShaders((IEnumerable<Shader>) shaders);
 
+        /// <summary>
+        /// Create a program from compiled shaders
+        /// </summary>
+        /// <param name="shaders">The shaders to use in this program</param>
+        /// <returns>The linked program, or null if initialization failed</returns>
         public static Program FromShaders(IEnumerable<Shader> shaders)
         {
             var shaderList = shaders.ToList(); // prevent multiple enumeration
@@ -136,14 +186,26 @@ namespace Diamond.Shaders
             return FromShaders(name, shaderList);
         }
 
+        /// <summary>
+        /// Create shaders from glsl source files, and create a program using them.
+        /// Shader types must be inferrable from file extensions.
+        /// </summary>
+        /// <param name="paths">The glsl source files</param>
+        /// <returns>The linked program, or null if initialization faileds</returns>
         public static Program FromFiles(params string[] paths)
         {
-            var shaders = paths.Select(Shader.FromFile).ToList();
+            if (paths == null)
+            {
+                Logger.Warn("Cannot create a program from no shaders.");
+                return null;
+            }
+
+            var shaders = paths.Select(path => Shader.FromFile(path)).ToList();
 
             var program = FromShaders(shaders);
 
             foreach (var shader in shaders)
-                shader.Dispose();
+                shader?.Dispose();
 
             return program;
         }
diff --git a/Diamond/Shaders/Shader.cs b/Diamond/Shaders/Shader.cs
index 05ebbe7..18d672a 100644
--- a/Diamond/Shaders/Shader.cs
+++ b/Diamond/Shaders/Shader.cs
@@ -6,12 +6,22 @@ using OpenTK.Graphics.OpenGL4;
 
 namespace Diamond.Shaders
 {
+    /// <summary>
+    /// Manges a OpenGL Shader object
+    /// </summary>
     public class Shader : GLObject
     {
         private readonly ShaderWrap _shader;
         internal override Wrapper Wrapper => _shader;
 
+        /// <summary>
+        /// The source used to create this shader
+        /// </summary>
         public string Source { get; }
+
+        /// <summary>
+        /// The type of this shader
+        /// </summary>
         public ShaderType Type { get; }
 
         internal Shader(ShaderWrap shader, string source, ShaderType type, string name)
@@ -26,14 +36,24 @@ namespace Diamond.Shaders
 
         #region Factory Methods
 
+        // Used to infer shader type based on file extension
         private static readonly Dictionary<string, ShaderType> Extensions = new Dictionary<string, ShaderType>
         {
             [".vs"] = ShaderType.VertexShader,
             [".vert"] = ShaderType.VertexShader,
             [".fs"] = ShaderType.FragmentShader,
             [".frag"] = ShaderType.FragmentShader,
+            [".gs"] = ShaderType.GeometryShader,
+            [".geom"] = ShaderType.GeometryShader,
         };
-        
+
+        /// <summary>
+        /// Create and compile a shader from glsl source code
+        /// </summary>
+        /// <param name="source">The glsl source</param>
+        /// <param name="type">The type of shader to create</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The compiled Shader, or null if initialization failed</returns>
         public static Shader FromSource(string source, ShaderType type, string name = "Shader")
         {
             var wrapper = new ShaderWrap(type);
@@ -57,7 +77,14 @@ namespace Diamond.Shaders
             return service;
         }
 
-        public static Shader FromFile(string path, ShaderType type)
+        /// <summary>
+        /// Create and compile a shader from a glsl source file
+        /// </summary>
+        /// <param name="path">The path to the glsl source file</param>
+        /// <param name="type">The type of the shader to create</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns></returns>
+        public static Shader FromFile(string path, ShaderType type, string name = null)
         {
             if (!File.Exists(path))
             {
@@ -65,11 +92,21 @@ namespace Diamond.Shaders
                 return null;
             }
 
-            var name = Path.GetFileNameWithoutExtension(path);
+            if (name == null)
+                name = Path.GetFileNameWithoutExtension(path);
+
             return FromSource(File.ReadAllText(path), type, name);
         }
 
-        public static Shader FromFile(string path)
+        /// <summary>
+        /// Create and compile a shader from a glsl source file. Shader type is inferred from file extension.
+        /// Extension must be .vs, .vert, .fs, .frag, .gs, or .geom. This can optionally be followed by .glsl or .txt,
+        /// but the shader type extension must be present.
+        /// </summary>
+        /// <param name="path">The path to the glsl source file</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The compiled shader, or null if initialization failed or shader type cannot be inferred</returns>
+        public static Shader FromFile(string path, string name = null)
         {
             if (!File.Exists(path))
             {
@@ -78,12 +115,14 @@ namespace Diamond.Shaders
             }
 
             var ext = Path.GetExtension(path);
-            var name = Path.GetFileNameWithoutExtension(path);
+            var fileName = Path.GetFileNameWithoutExtension(path);
 
+            // get sub-extension if real extension is not valid
             if (ext != null)
                 if (!Extensions.ContainsKey(ext))
-                    ext = Path.GetExtension(name);
+                    ext = Path.GetExtension(fileName);
 
+            // if no extension, no sub-extension, or invalid sub-extension
             if (ext == null || !Extensions.ContainsKey(ext))
             {
                 Logger.Warn("Could not infer shader type from glsl file name {0}", path);
@@ -91,8 +130,10 @@ namespace Diamond.Shaders
             }
 
             var type = Extensions[ext];
+            if (name == null)
+                name = fileName;
 
-            return FromFile(path, type);
+            return FromFile(path, type, name);
         }
 
         #endregion
diff --git a/Diamond/Shaders/ShaderException.cs b/Diamond/Shaders/ShaderException.cs
deleted file mode 100644
index 361816e..0000000
--- a/Diamond/Shaders/ShaderException.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-using System;
-using System.Runtime.Serialization;
-
-namespace Diamond.Shaders
-{
-    /// <summary>
-    /// Exception relating to <code>Shader</code> and <code>Program</code> operations.
-    /// </summary>
-    [Serializable]
-    public class ShaderException : Exception
-    {
-        public ShaderException()
-        {
-        }
-
-        public ShaderException(string message)
-            : base(message)
-        {
-        }
-
-        public ShaderException(string message, Exception inner)
-            : base(message, inner)
-        {
-        }
-
-        protected ShaderException(
-            SerializationInfo info,
-            StreamingContext context)
-            : base(info, context)
-        {
-        }
-    }
-}
\ No newline at end of file
diff --git a/Diamond/Textures/Texture.cs b/Diamond/Textures/Texture.cs
index cbe28d3..a5c9eb7 100644
--- a/Diamond/Textures/Texture.cs
+++ b/Diamond/Textures/Texture.cs
@@ -1,5 +1,6 @@
 using System.Drawing;
 using System.Drawing.Imaging;
+using System.IO;
 using Diamond.Wrappers;
 using NLog;
 using OpenTK.Graphics.OpenGL4;
@@ -7,6 +8,9 @@ using PixelFormat = OpenTK.Graphics.OpenGL4.PixelFormat;
 
 namespace Diamond.Textures
 {
+    /// <summary>
+    /// Manages a OpenGL Texture object
+    /// </summary>
     public class Texture : GLObject
     {
         private readonly TextureWrap _texture;
@@ -18,15 +22,26 @@ namespace Diamond.Textures
             Name = name;
         }
 
+        /// <summary>
+        /// This textures target; how it is used
+        /// </summary>
         public TextureTarget Target => _texture.Target;
 
-        public void Bind() => _texture.Bind();
+        /// <summary>
+        /// Bind this texture to a particular unit
+        /// </summary>
         public void Bind(int unit) => _texture.Bind(unit);
 
         public override string ToString() => Name == null ? $"{Target} ({Id})" : $"{Target} \'{Name}\' ({Id})";
 
         #region Factory Methods
 
+        /// <summary>
+        /// Create a texture object and upload bitmap data to it
+        /// </summary>
+        /// <param name="bmp">The image to upload</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The initialized Texture, or null if initialsation failed</returns>
         public static Texture FromBitmap(Bitmap bmp, string name = null)
         {
             var wrapper = new TextureWrap(TextureTarget.Texture2D);
@@ -35,6 +50,8 @@ namespace Diamond.Textures
             Logger.Debug("Created Texture {0}", service);
 
             wrapper.Bind();
+
+            // todo: expose texture parameters to enable setting different filters
             wrapper.TexParameter(TextureParameterName.TextureMinFilter, (int) TextureMinFilter.Nearest);
             wrapper.TexParameter(TextureParameterName.TextureMagFilter, (int) TextureMagFilter.Nearest);
 
@@ -47,9 +64,18 @@ namespace Diamond.Textures
             return service;
         }
 
-        public static Texture FromFile(string path)
+        /// <summary>
+        /// Create a texture and upload the contents of an image file to it
+        /// </summary>
+        /// <param name="path">The path to the file</param>
+        /// <param name="name">The name of this GLObject</param>
+        /// <returns>The initialized Texture, or null if instantiation failed</returns>
+        public static Texture FromFile(string path, string name = null)
         {
-            return FromBitmap(new Bitmap(path));
+            if (name == null)
+                name = Path.GetFileNameWithoutExtension(path);
+
+            return FromBitmap(new Bitmap(path), name);
         }
 
         #endregion
diff --git a/Diamond/Level/TileData.cs b/Diamond/Util/TileData.cs
similarity index 94%
rename from Diamond/Level/TileData.cs
rename to Diamond/Util/TileData.cs
index d857b7b..2af7f99 100644
--- a/Diamond/Level/TileData.cs
+++ b/Diamond/Util/TileData.cs
@@ -1,7 +1,7 @@
 using Diamond.Buffers;
 using OpenTK;
 
-namespace Diamond.Level
+namespace Diamond.Util
 {
     [VertexData(Divisor = 1)]
     public struct TileData
diff --git a/hexworld/HexRender.cs b/hexworld/HexRender.cs
index 4ac30d4..889c509 100644
--- a/hexworld/HexRender.cs
+++ b/hexworld/HexRender.cs
@@ -2,7 +2,6 @@
 using System.IO;
 using System.Linq;
 using Diamond.Buffers;
-using Diamond.Level;
 using Diamond.Shaders;
 using Diamond.Textures;
 using Diamond.Util;