diff --git a/Render.Test/tests/Rendering.Test.cs b/Render.Test/tests/Rendering.Test.cs
index a6366af..335b94f 100644
--- a/Render.Test/tests/Rendering.Test.cs
+++ b/Render.Test/tests/Rendering.Test.cs
@@ -23,7 +23,7 @@ public class RenderingTest {
         
         // Create object
         var mesh = new Geometry.Primitives.Cube(size: 1, centre: Vec3.Zero);
-        var obj = new Renderable(mesh: mesh, uv: UV.Spherical(mesh), material: new Wireframe(Color.Red));
+        var obj = new MeshRenderer(mesh: mesh, uv: UV.Spherical(mesh), material: new Wireframe(Color.Red));
         scene.Add(obj);
 
         // Render
@@ -42,9 +42,9 @@ public class RenderingTest {
         var bblock  = Transformation.Scale(new Vec3(0.2, 1, 0.2)) * new Cube(size: 1, centre: Vec3.Zero);
         var ball    = new Sphere(radius: 0.2, centre: Vec3.Zero);
 
-        var aobj    = new Renderable(mesh: ablock, material: new UnlitColour(Color.Red));
-        var bobj    = new Renderable(mesh: bblock, material: new UnlitColour(Color.Blue));
-        var ballobj = new Renderable(mesh: ball, material: new UnlitColour(Color.Yellow));
+        var aobj    = new MeshRenderer(mesh: ablock, material: new UnlitColour(Color.Red));
+        var bobj    = new MeshRenderer(mesh: bblock, material: new UnlitColour(Color.Blue));
+        var ballobj = new MeshRenderer(mesh: ball, material: new UnlitColour(Color.Yellow));
         
         aobj.Transform = Transformation.Offset(new Vec3(-1, 0, 0));
         bobj.Transform = Transformation.Offset(new Vec3(1, 0, 0));
@@ -68,6 +68,8 @@ public class RenderingTest {
         camera.Skybox = new GradientSkybox(Color.FromArgb (255, 58, 58, 82), Color.FromArgb (255, 2, 1, 17));
 
         // Create objects
+        var helper = new AxisHelper();
+
         var planet = new Geometry.Primitives.Sphere(radius: 1, centre: Vec3.Zero, horizontalResolution: 32, verticalResolution: 32);
         var planetTexture = LoadImage("assets/planet.png");
 
@@ -77,13 +79,19 @@ public class RenderingTest {
         var hierarchy = new SceneNode();
         scene.Add(hierarchy);
 
-        var planetObj = new Renderable(mesh: planet, uv: UV.Spherical(planet), material: new UnlitTexture(planetTexture));
+        var planetObj = new MeshRenderer(mesh: planet, uv: UV.Spherical(planet), material: new UnlitTexture(planetTexture));
         hierarchy.Add(planetObj);
 
-        var satelliteObj = new Renderable(mesh: satellite, uv: UV.Spherical(satellite), material: new UnlitTexture(satelliteTexture)); 
+        var satelliteObj = new MeshRenderer(mesh: satellite, uv: UV.Spherical(satellite), material: new UnlitTexture(satelliteTexture)); 
         satelliteObj.Transform = Transformation.Offset(new Vec3(-1.6, 1.6, 0.1));
         hierarchy.Add(satelliteObj);
 
+        helper.Transform = Transformation.Scale(Vec3.One * 1.3);
+        helper.XLabel = "X";
+        helper.YLabel = "Y";
+        helper.ZLabel = "Z";
+        hierarchy.Add(helper);
+
         // Render
         SaveAnimation("render.complex", SpinAnimation(camera, hierarchy, frames: 64));
     }
diff --git a/Render/Render.csproj b/Render/Render.csproj
index 8b84ea3..c260595 100644
--- a/Render/Render.csproj
+++ b/Render/Render.csproj
@@ -11,7 +11,7 @@
 
   <PropertyGroup>
     <PackageId>Qkmaxware.Rendering</PackageId>
-    <Version>1.0.1</Version>
+    <Version>1.0.2</Version>
     <Authors>Colin Halseth</Authors>
     <PackageTags>softrendering</PackageTags>
     <PackageLicenseFile>LICENSE.md</PackageLicenseFile>
@@ -26,7 +26,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Qkmaxware.Geometry" Version="1.0.4" />
+    <PackageReference Include="Qkmaxware.Geometry" Version="1.0.6" />
   </ItemGroup>
 
 </Project>
diff --git a/Render/src/AxisHelper.cs b/Render/src/AxisHelper.cs
new file mode 100644
index 0000000..76e7d85
--- /dev/null
+++ b/Render/src/AxisHelper.cs
@@ -0,0 +1,104 @@
+using System.Drawing;
+using Qkmaxware.Geometry;
+using Qkmaxware.Geometry.Primitives;
+
+namespace Qkmaxware.Rendering {
+
+/// <summary>
+/// XYZ axis helper
+/// </summary>
+public class AxisHelper : SceneNode {
+
+    private MeshRenderer XObject;
+    private MeshRenderer XLabelObject;
+    private MeshRenderer YObject;
+    private MeshRenderer YLabelObject;
+    private MeshRenderer ZObject;
+    private MeshRenderer ZLabelObject;
+
+    /// <summary>
+    /// Create a new axis helper
+    /// </summary>
+    public AxisHelper() {
+        var rootX = CreateAxis(new UnlitColour(Color.Red), out XObject, out XLabelObject);
+        var rootY = CreateAxis(new UnlitColour(Color.Green), out YObject, out YLabelObject);
+        var rootZ = CreateAxis(new UnlitColour(Color.Blue), out ZObject, out ZLabelObject);
+
+        rootX.Transform = Transformation.Ry(-90 * Angle.Deg2Rad);
+        rootY.Transform = Transformation.Rx(-90 * Angle.Deg2Rad);
+    }
+
+    private string? xLabel;
+
+    /// <summary>
+    /// The label used for the x-Axis
+    /// </summary>
+    /// <value>the label</value>
+    public string? XLabel {
+        get {
+            return xLabel;
+        }
+        set {
+            this.xLabel = value;
+            if (value != null) {
+                var mesh = new TextMesh(value);
+                XLabelObject.Mesh = mesh;
+                XLabelObject.Material = XObject.Material;
+            }
+        }
+    }
+
+    private string? yLabel;
+    /// <summary>
+    /// The label used for the y-Axis
+    /// </summary>
+    /// <value>the label</value>
+    public string? YLabel {
+        get {
+            return yLabel;
+        }
+        set {
+            this.yLabel = value;
+            if (value != null) {
+                var mesh = new TextMesh (value);
+                YLabelObject.Mesh = mesh;
+                YLabelObject.Material = YObject.Material;
+            }
+        }
+    }
+
+    private string? zLabel;
+    /// <summary>
+    /// The label used for the z-Axis
+    /// </summary>
+    /// <value>the label</value>
+    public string? ZLabel {
+        get {
+            return zLabel;
+        }
+        set {
+            this.zLabel = value;
+            if (value != null) {
+                var mesh = new TextMesh(value);
+                ZLabelObject.Mesh = mesh;
+                ZLabelObject.Material = ZObject.Material;
+            }
+        }
+    }
+
+    private SceneNode CreateAxis(Material mat, out MeshRenderer arrow, out MeshRenderer label) {
+        var arrowMesh = new Arrow(length: 1);
+        arrow = new MeshRenderer(mesh: arrowMesh, material: mat);
+        label = new MeshRenderer();
+        label.Transform = Transformation.Offset(new Vec3(0, 0, 1.1)) * Transformation.Ry(90 * Angle.Deg2Rad);
+        
+        var root = new SceneNode();
+        root.Add(arrow);
+        root.Add(label);
+
+        this.Add(root);
+        return root;
+    }
+}
+
+}
\ No newline at end of file
diff --git a/Render/src/BaseCamera.cs b/Render/src/BaseCamera.cs
index a539673..647693e 100644
--- a/Render/src/BaseCamera.cs
+++ b/Render/src/BaseCamera.cs
@@ -99,10 +99,10 @@ public abstract class BaseCamera : SceneNode {
         vars.LightSources = scene.OfType<LightSource>().ToList().AsReadOnly();
 
         // Loop over all models
-        foreach (var renderable in scene.OfType<Renderable>()) {
+        foreach (var renderable in scene.OfType<IRenderable>()) {
             vars.ModelToWorld = renderable.LocalToWorldMatrix;
             if (renderable.Mesh != null && renderable.Material != null) {
-                Render(ref vars, renderable.Mesh, renderable.UVs, renderable.Material);
+                Render(ref vars, renderable.Mesh, renderable.UVs, (Material)renderable.Material);
             }
         }
     }
@@ -220,7 +220,7 @@ public abstract class BaseCamera : SceneNode {
 
     private void SetPixel(Vec3 pixel, Color c) {
         var x = (int)Math.Floor(pixel.X);
-        var y = (int)Math.Floor(pixel.Y);
+        var y = Size.Height - (int)Math.Floor(pixel.Y);
         var depth = pixel.Z;
 
         if (x >= 0 && y >= 0 && x < Size.Width && y < Size.Height) {
diff --git a/Render/src/IRenderable.cs b/Render/src/IRenderable.cs
new file mode 100644
index 0000000..ef40183
--- /dev/null
+++ b/Render/src/IRenderable.cs
@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using Qkmaxware.Geometry;
+
+namespace Qkmaxware.Rendering {
+
+/// <summary>
+/// Interface for any renderable 3d objects
+/// </summary>
+public interface IRenderable {
+    /// <summary>
+    /// Mesh to render
+    /// </summary>
+    IEnumerable<Triangle>? Mesh {get;}
+    /// <summary>
+    /// Vertex UV coordinates
+    /// </summary>
+    IUvMap? UVs {get;}
+    /// <summary>
+    /// Render material
+    /// </summary>
+    Material? Material {get;}
+    // <summary>
+    /// Matrix to convert from local to world space
+    /// </summary>
+    Transformation LocalToWorldMatrix {get;}
+}
+
+}
\ No newline at end of file
diff --git a/Render/src/Renderable.cs b/Render/src/MeshRenderer.cs
similarity index 65%
rename from Render/src/Renderable.cs
rename to Render/src/MeshRenderer.cs
index 6b2b636..19e2e64 100644
--- a/Render/src/Renderable.cs
+++ b/Render/src/MeshRenderer.cs
@@ -7,30 +7,33 @@ namespace Qkmaxware.Rendering {
 /// <summary>
 /// Object that can be rendered by the camera
 /// </summary>
-public class Renderable : SceneNode {
+public class MeshRenderer : SceneNode, IRenderable {
     /// <summary>
     /// Mesh to render
     /// </summary>
-    public IEnumerable<Triangle>? Mesh;
+    /// <returns>mesh</returns>
+    public IEnumerable<Triangle>? Mesh {get; set;}
     /// <summary>
     /// Vertex UV coordinates
     /// </summary>
-    public IUvMap? UVs;
+    /// <returns>uv map</returns>
+    public IUvMap? UVs {get; set;}
     /// <summary>
     /// Render material
     /// </summary>
-    public Material Material = new UnlitColour(Color.White);
+    /// <returns>material</returns>
+    public Material? Material {get; set;} = new UnlitColour(Color.White);
 
     /// <summary>
     /// Create empty renderable
     /// </summary>
-    public Renderable() {}
+    public MeshRenderer() {}
 
     /// <summary>
     /// Create renderable with geometry
     /// </summary>
     /// <param name="mesh">geometry</param>
-    public Renderable(IEnumerable<Triangle> mesh) {
+    public MeshRenderer(IEnumerable<Triangle> mesh) {
         this.Mesh = mesh;
     }
 
@@ -40,7 +43,7 @@ public class Renderable : SceneNode {
     /// <param name="mesh">geometry</param>
     /// <param name="material">material</param>
     /// <param name="uv">uv map</param>
-    public Renderable(IEnumerable<Triangle> mesh, Material material, IUvMap? uv = null) {
+    public MeshRenderer(IEnumerable<Triangle> mesh, Material material, IUvMap? uv = null) {
         this.Mesh = mesh;
         this.UVs = uv;
         this.Material = material;
diff --git a/Render/src/Skybox.cs b/Render/src/Skybox.cs
index 817fbfb..ae5ac14 100644
--- a/Render/src/Skybox.cs
+++ b/Render/src/Skybox.cs
@@ -71,7 +71,7 @@ public class GradientSkybox : Skybox {
         } else {
             var vangle = Math.Acos(z / length);
             var interpolation_factor = vangle / Math.PI; // angles are 0deg to 180deg (0 to Pi radians)
-            return Blend(top, bottom, interpolation_factor);
+            return Blend(bottom, top, interpolation_factor);
         }
     }
 }
diff --git a/docs/using.md b/docs/using.md
index 44148f9..ca2b9ec 100644
--- a/docs/using.md
+++ b/docs/using.md
@@ -7,13 +7,13 @@ All scene management start off from the `Scene` class which acts as the root of
 Scene scene = new Scene();
 ```
 
-We can attach `SceneNode` objects to the scene and to other scene nodes in order to fill out the scene hierarchy. Currently there are 3 types of scene nodes. The base `SceneNode` class is used purely to construct the hierarchy and provides no additional functionality. The `Renderable` class is used to render a geometric object to the camera. This object can be provided with a UV map which is used to map geometry vertices to texture coordinates as well as a material which defines how the object is coloured. Additionally the `Animator` class is used with an `AnimatedScene` to apply actions to nodes between animation frames which is covered the section [Animated Scenes](#animated-scenes).
+We can attach `SceneNode` objects to the scene and to other scene nodes in order to fill out the scene hierarchy. Currently there are 3 types of scene nodes. The base `SceneNode` class is used purely to construct the hierarchy and provides no additional functionality. The `MeshRenderer` class is used to render a geometric object to the camera. This object can be provided with a UV map which is used to map geometry vertices to texture coordinates as well as a material which defines how the object is coloured. Additionally the `Animator` class is used with an `AnimatedScene` to apply actions to nodes between animation frames which is covered the section [Animated Scenes](#animated-scenes).
 
 ```cs
 SceneNode emptyNode = new SceneNode();
 scene.Add(emptyNode);
 
-Renderable mesh = new Renderable(
+MeshRenderer mesh = new MeshRenderer(
     mesh: new Sphere(radius: 1, centre: Vec3.Zero),
     uv: null,
     material: new Wireframe(Color.Red)