small fixes

data/assets/dsn.scene

@@ -9,6 +9,7 @@ asset.require('scene/solarsystem/planets')
 asset.require('scene/solarsystem/dwarf_planets/pluto/pluto')
 asset.require('scene/solarsystem/dwarf_planets/pluto/pluto_trail')
 asset.request('scene/digitaluniverse/stars')
+asset.request('scene/digitaluniverse/milkyway')
 asset.request('customization/globebrowsing')
 asset.request('scene/digitaluniverse/grids')
 

data/assets/scene/solarsystem/dsn/stations.asset

@@ -39,7 +39,8 @@ local siteColorMap = {
 
 -- stationMap 
 -- SiteColor: determines color of the signals going to this station
--- Size: The height of the station, either 34 or 70m for modern stations
+-- Size: The height of the station, approximately the same as their 
+--       dish diameter size which is 34m or 70m for modern stations
 local stationMap = {
                  DSS13 = {
                     SiteColor = "GoldstoneColor",

modules/dsn/rendering/renderablesignals.cpp

@@ -407,7 +407,7 @@ void RenderableSignals::update(const UpdateData& data) {
         GL_ARRAY_BUFFER,
         _vertexArray.size() * sizeof(float),
         _vertexArray.data(),
-        GL_STATIC_DRAW
+        GL_DYNAMIC_DRAW
     );
 
     updateVertexAttributes();