Add habitable zone asset for our solar system

data/assets/base.asset

@@ -7,6 +7,7 @@ asset.require('./base_blank')
 -- Specifying which other assets should be loaded in this scene
 asset.require('scene/solarsystem/sun/sun')
 asset.require('scene/solarsystem/sun/glare')
+asset.require('scene/solarsystem/sun/habitablezone')
 asset.require('scene/solarsystem/sun/default_layers')
 asset.require('scene/solarsystem/planets/planets')
 asset.require('scene/solarsystem/planets/default_layers')

data/assets/scene/solarsystem/sun/habitablezone.asset

@@ -0,0 +1,35 @@
+local assetHelper = asset.require("util/asset_helper")
+local transforms = asset.require("./transforms")
+
+local color = {0, 1, 0.81};
+local texture = openspace.absPath(openspace.createPixelImage('sun_habitable_zone', color));
+
+local HabitableZone = {
+    Identifier = "SunHabitableZone",
+    Parent =  transforms.SunECLIPJ2000.Identifier,
+    Renderable = {
+        Type = "RenderableHabitableZone",
+        Enabled = false,
+        Texture = texture,
+        EffectiveTemperature = 5780, -- Kelvin
+        Luminosity = 1, -- solar
+        Opacity = 0.06
+    },
+    GUI = {
+        Name = "Sun Habitable Zone",
+        Path = "/Solar System/Sun",
+        Description = "Habitable zone for the sun in our solar system."
+    }
+}
+
+assetHelper.registerSceneGraphNodesAndExport(asset, { HabitableZone })
+
+asset.meta = {
+    Name = "Sun Habitable Zone",
+    Version = "1.0",
+    Description = [[ The habitable zone around our sun]],
+    Author = "OpenSpace Team",
+    URL = "http://openspaceproject.com",
+    License = "MIT license",
+    Identifiers = {"SunHabitableZone"}
+}