Add examples for circle, ellipse and elliptic disc

data/assets/examples/discs.asset

@@ -1,16 +1,14 @@
 local assetHelper = asset.require('util/asset_helper')
 
-local color = {0.0, 1.0, 1.0}
-
 -- @TODO (emmbr 2020-02-03) Potential threading issue later on? This will run on the main thread
-local singeColorTexturePath = openspace.createSingeColorImage("example_ring_color", color)
+local cyanTexture = openspace.createSingeColorImage("example_disc_color1", {0.0, 1.0, 1.0})
+local purpleTexture = openspace.createSingeColorImage("example_disc_color2", {0.5, 0.0, 0.5})
 
 local BasicDisc = {
     Identifier = "BasicDisc",
-    Parent = "Root",
     Renderable = {
         Type = "RenderableDisc",
-        Texture = singeColorTexturePath,
+        Texture = cyanTexture,
         Size = 1e10,
         Width = 0.5
     },
@@ -20,6 +18,29 @@ local BasicDisc = {
     }
 }
 
+-- Elliptic discs can be created using a non-uniform scaling
+-- For a full disc, use a width of 1.0
+local FullEllipticDisc = {
+    Identifier = "FullEllipticDisc",
+    Transform = {
+        Scale = {
+            Type = "NonUniformStaticScale",
+            Scale = {2.0, 1.0, 1.0}
+        }
+    },
+    Renderable = {
+        Type = "RenderableDisc",
+        Texture = purpleTexture,
+        Size = 2e10,
+        Width = 1.0
+    },
+    GUI = {
+        Name = "Full Elliptic Disc",
+        Path = "/Examples/Discs"
+    }
+}
+
 assetHelper.registerSceneGraphNodesAndExport(asset, {
-    BasicDisc
+    BasicDisc,
+    FullEllipticDisc
 })

data/assets/examples/primitives.asset

@@ -0,0 +1,52 @@
+local assetHelper = asset.require('util/asset_helper')
+
+local scale = 149597870700 -- 1 AU
+
+local circle = {
+    Identifier = "ExampleCircle",
+    Transform = {
+        Scale = {
+            Type = "StaticScale",
+            Scale = scale
+        }
+    },
+    Renderable = {
+        Type = "RenderableRadialGrid",
+        Color = { 0.6, 0.6, 0.8 },
+        LineWidth = 3.0,
+        GridSegments = { 1, 1 },
+        CircleSegments = 64,
+        OuterRadius = 1.0
+    },
+    GUI = {
+        Name = "Example Circle",
+        Path = "/Examples/Primitives"
+    }
+}
+
+local ellipse = {
+    Identifier = "ExampleEllipse",
+    Transform = {
+        Scale = {
+            Type = "NonUniformStaticScale",
+            Scale = {1.5, 1.0, 1.0}
+        }
+    },
+    Renderable = {
+        Type = "RenderableRadialGrid",
+        Color = { 0.6, 0.8, 0.6 },
+        LineWidth = 3.0,
+        GridSegments = { 1, 1 },
+        CircleSegments = 64,
+        OuterRadius = scale
+    },
+    GUI = {
+        Name = "Example Ellipse",
+        Path = "/Examples/Primitives"
+    }
+}
+
+assetHelper.registerSceneGraphNodesAndExport(asset, {
+    circle,
+    ellipse
+})