Nasal/earthview.nas

   1 ###########################################################
   2 # Earthview orbital rendering
   3 ###########################################################
   4
   5 var start = func() {
   6
   7 if (earthview_running_flag ==1) {return;}
   8
   9 earthview_running_flag = 1;
  10
  11 var lat = getprop("/position/latitude-deg");
  12 var lon = getprop("/position/longitude-deg");
  13
  14 earth_model.node = earthview.place_earth_model("Models/Astro/earth.xml",lat, lon, 0.0, 0.0, 0.0, 0.0);
  15 cloudsphere_model.node = earthview.place_earth_model("Models/Astro/cloudsphere.xml",lat, lon, 0.0, 0.0, 0.0, 0.0);
  16
  17 # set Basic Weather off
  18 props.globals.getNode("/environment/config/enabled").setBoolValue(0);
  19 props.globals.getNode("/environment/params/metar-updates-environment").setBoolValue(0);
  20
  21 # set some reasonable defaults
  22
  23 setprop("/environment/visibility-m", 80000.0);
  24 setprop("/sim/rendering/mie", 0.0);
  25 setprop("/sim/rendering/rayleigh", 0.00002);
  26 setprop("/sim/rendering/dome-density", 1.0);
  27
  28 control_loop();
  29
  30 }
  31
  32 var stop = func () {
  33
  34 earth_model.node.remove();
  35 cloudsphere_model.node.remove();
  36 setprop("/earthview/control_loop_flag",0);
  37
  38 earthview_running_flag = 0;
  39 }
  40
  41 var place_earth_model = func(path, lat, lon, alt, heading, pitch, roll) {
  42
  43
  44
  45 var m = props.globals.getNode("models", 1);
  46                 for (var i = 0; 1; i += 1)
  47                         if (m.getChild("model", i, 0) == nil)
  48                                 break;
  49 var model = m.getChild("model", i, 1);
  50
  51 var R1 = 5800000.0;
  52 var R2 = 58000.0;
  53
  54 var altitude1 = getprop("/position/altitude-ft");
  55 var altitude2 = R2/R1 * altitude1;
  56 var model_alt = altitude1 - altitude2 - R2 * m_to_ft;
  57
  58 setprop("/earthview/latitude-deg", lat);
  59 setprop("/earthview/longitude-deg", lon);
  60 setprop("/earthview/elevation-ft", model_alt);
  61 setprop("/earthview/heading-deg", heading);
  62 setprop("/earthview/pitch-deg", pitch);
  63 setprop("/earthview/roll-deg", roll);
  64 setprop("/earthview/yaw-deg", 0.0);
  65
  66 var eview = props.globals.getNode("earthview", 1);
  67 var latN = eview.getNode("latitude-deg",1);
  68 var lonN = eview.getNode("longitude-deg",1);
  69 var altN = eview.getNode("elevation-ft",1);
  70 var headN = eview.getNode("heading-deg",1);
  71 var pitchN = eview.getNode("pitch-deg",1);
  72 var rollN = eview.getNode("roll-deg",1);
  73
  74
  75
  76 model.getNode("path", 1).setValue(path);
  77 model.getNode("latitude-deg-prop", 1).setValue(latN.getPath());
  78 model.getNode("longitude-deg-prop", 1).setValue(lonN.getPath());
  79 model.getNode("elevation-ft-prop", 1).setValue(altN.getPath());
  80 model.getNode("heading-deg-prop", 1).setValue(headN.getPath());
  81 model.getNode("pitch-deg-prop", 1).setValue(pitchN.getPath());
  82 model.getNode("roll-deg-prop", 1).setValue(rollN.getPath());
  83 model.getNode("load", 1).remove();
  84
  85 setprop("/earthview/heading-deg",90);
  86 setprop("/earthview/control_loop_flag",1);
  87
  88
  89
  90 return model;
  91 }
  92
  93
  94 var control_loop = func {
  95
  96 var R1 = 5800000.0;
  97 var R2 = 58000.0;
  98
  99 var altitude1 = getprop("/position/altitude-ft");
 100 var altitude2 = R2/R1 * altitude1;
 101 var model_alt = altitude1 - altitude2 - R2 * m_to_ft;
 102
 103 setprop("/earthview/elevation-ft", model_alt);
 104
 105 var lat = getprop("/position/latitude-deg");
 106 var lon = getprop("/position/longitude-deg");
 107
 108 setprop("/earthview/latitude-deg", lat);
 109 setprop("/earthview/longitude-deg", lon);
 110
 111 setprop("/earthview/roll-deg", -(90-lat));
 112 setprop("/earthview/yaw-deg", -lon);
 113
 114 # now set scattering paramaters
 115
 116 if (getprop("/earthview/mrd-flag") == 1)
 117         {
 118         var rayleigh = 0.0002;
 119         var mie = 0.001;
 120         var density = 1.0;
 121
 122         if (altitude1 < 300000.0)
 123                 {
 124                 setprop("/sim/rendering/rayleigh",rayleigh);
 125                 setprop("/sim/rendering/mie",mie);
 126                 setprop("/sim/rendering/dome-density",density);
 127                 }
 128         else if (altitude1 < 650000.0)
 129                 {
 130                 rayleigh = rayleigh - 0.00018 * (altitude1-300000.0)/350000.0;
 131                 mie = mie - 0.001 * (altitude1-300000.0)/350000.0;
 132                 density = 1.0;
 133                 setprop("/sim/rendering/rayleigh",rayleigh);
 134                 setprop("/sim/rendering/mie",mie);
 135                 setprop("/sim/rendering/dome-density",density);
 136                 }
 137         else
 138                 {
 139                 rayleigh = 0.00002;
 140                 mie = 0.0;
 141                 density = 1.0;
 142                 setprop("/sim/rendering/rayleigh",rayleigh);
 143                 setprop("/sim/rendering/mie",mie);
 144                 setprop("/sim/rendering/dome-density",density);
 145                 }
 146
 147         }
 148
 149
 150 if (getprop("/earthview/control_loop_flag") ==1) {settimer( func {control_loop(); },0);}
 151 }
 152
 153
 154 var ft_to_m = 0.30480;
 155 var m_to_ft = 1.0/ft_to_m;
 156 var earth_model = {};
 157 var cloudsphere_model = {};
 158 var earthview_running_flag = 0;
 159
 160