added asset helper back with deprication warning

data/assets/util/asset_helper.asset

@@ -0,0 +1,187 @@
+openspace.printWarning([[Warning asset_helper has been depricated and will be removed in future verions]]);
+local tableLength = function(table)
+  local count = 0
+  for _ in pairs(table) do count = count + 1 end
+  return count
+end
+
+
+local registerSpiceKernels = function (spiceAsset, kernels)
+  spiceAsset.onInitialize(function ()
+    for i, kernel in ipairs(kernels) do
+      openspace.spice.loadKernel(kernel)
+    end
+  end)
+  spiceAsset.onDeinitialize(function ()
+    for i = #kernels, 1, -1 do
+      local kernel = kernels[i]
+      openspace.spice.unloadKernel(kernel) 
+    end
+  end)
+end
+
+local registerSceneGraphNodes = function (sceneAsset, nodes, override)
+  override = override or false
+  if not override then
+    if tableLength(nodes) == 0 then
+      openspace.printWarning(sceneAsset.filePath .. ": Register function was called with an empty node list. Pass 'true' as third argument to silence this warning.")
+      return
+    end
+  end
+
+
+  sceneAsset.onInitialize(function ()
+    for i, node in ipairs(nodes) do
+      openspace.addSceneGraphNode(node)
+    end
+  end)
+  sceneAsset.onDeinitialize(function ()
+    for i = #nodes, 1, -1 do
+      node = nodes[i]
+      openspace.removeSceneGraphNode(node.Identifier)
+    end
+  end)
+end
+
+
+local registerScreenSpaceRenderables = function (sceneAsset, renderables, override)
+  override = override or false
+  if not override then
+    if tableLength(renderables) == 0 then
+      openspace.printWarning(sceneAsset.filePath .. ": Register function was called with an empty node list. Pass 'true' as third argument to silence this warning.")
+      return
+    end
+  end
+
+  sceneAsset.onInitialize(function ()
+    for i, node in ipairs(renderables) do
+      openspace.addScreenSpaceRenderable(node)
+    end
+  end)
+  sceneAsset.onDeinitialize(function ()
+    for i = #renderables, 1, -1 do
+      renderable = renderables[i]
+      openspace.removeScreenSpaceRenderable(renderable.Identifier)
+    end
+  end)
+end
+
+local registerDashboardItems = function (dashboardAsset, items)
+  dashboardAsset.onInitialize(
+    function ()
+      for i, item in ipairs(items) do
+        openspace.dashboard.addDashboardItem(item)
+      end
+    end
+  )
+  dashboardAsset.onDeinitialize(function ()
+    for i = #items, 1, -1 do
+      local item = items[i]
+      openspace.dashboard.removeDashboardItem(item.Identifier)
+    end
+  end)
+end
+
+local registerSceneGraphNodesAndExport = function (sceneAsset, nodes, override)
+  override = override or false
+  if not override then
+    if tableLength(nodes) == 0 then
+      openspace.printWarning(sceneAsset.filePath .. ": Register function was called with an empty node list. Pass 'true' as third argument to silence this warning.")
+      return
+    end
+  end
+
+  for i, node in ipairs(nodes) do
+    if not node.Identifier then
+      openspace.printError("Could not load asset as Identifier was missing")
+    end
+  end
+
+  sceneAsset.onInitialize(function ()
+    for i, node in ipairs(nodes) do
+      openspace.addSceneGraphNode(node)
+    end
+  end)
+  sceneAsset.onDeinitialize(function ()
+    for i = #nodes, 1, -1 do
+      local node = nodes[i]
+      openspace.removeSceneGraphNode(node.Identifier)
+    end
+  end)
+
+  for i, node in ipairs(nodes) do
+    sceneAsset.export(node.Identifier, node)
+  end
+end
+
+local requireAll = function (sceneAsset, directory)
+  function string.ends(String,End)
+    return End=='' or string.sub(String,-string.len(End))==End
+  end
+
+  local result = {}
+
+  local files = openspace.walkDirectoryFiles(sceneAsset.localResource('') .. directory, true)
+  for _, file in pairs(files) do
+    if file:ends('.asset') then
+      openspace.printDebug("Requiring: " .. file:sub(file:find(directory), -7))
+      local exports = sceneAsset.require(file:sub(1, -7))
+      table.insert(result, exports)
+    end
+  end
+
+  return result
+end
+
+local getDefaultLightSources = function (solarSystemBarycenterIdentifier)
+  local sourceList = {
+    {
+      Type = "SceneGraphLightSource",
+      Identifier = "Sun",
+      Node = solarSystemBarycenterIdentifier,
+      Intensity = 1.0
+    },
+    {
+      Identifier = "Camera",
+      Type = "CameraLightSource",
+      Intensity = 0.5
+    }
+  }
+  return sourceList
+end
+
+
+local createModelPart = function (parent, sunLightSourceNode, models, geometry, texture, performShading)
+  local lightSources = {}
+  if performShading then
+    lightSources[1] = {
+        Type = "SceneGraphLightSource",
+        Identifier = "Sun",
+        Node = sunLightSourceNode,
+        Intensity = 1.0
+    }
+  end
+  return {
+    Identifier = parent .. "-" .. geometry,
+    Parent = parent,
+    Renderable = {
+      Type = "RenderableModel",
+      GeometryFile =  models .. "/" .. geometry .. ".obj",
+      LightSources = lightSources,
+      PerformShading = performShading,
+      DisableFaceCulling = true 
+    },
+    GUI = {
+      Hidden = true
+    }
+  }
+end
+
+asset.export("registerSceneGraphNodes", registerSceneGraphNodes)
+asset.export("registerSceneGraphNodesAndExport", registerSceneGraphNodesAndExport)
+asset.export("registerScreenSpaceRenderables", registerScreenSpaceRenderables)
+asset.export("registerSpiceKernels", registerSpiceKernels)
+asset.export("registerDashboardItems", registerDashboardItems)
+asset.export("requireAll", requireAll)
+asset.export("getDefaultLightSources", getDefaultLightSources)
+asset.export("createModelPart", createModelPart)