place stars at their actual xyz coordinate. (try zooming out in map 🤯)

doc/scripts/generate_starchart.py

@@ -34,33 +34,34 @@ MAX_APPARENT_MAGNITUDE = 7.0
 print("// This file was autogenerated by \"genrate_starchart.py\" using data from the")
 print("// HYG database: https://github.com/astronexus/HYG-Database/tree/main/hyg")
 print("// License: CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/")
-print("// Each star's values: (x, y, z, magnitude, color index, distance, name)")
+print("// Each star's values: (x, y, z, magnitude, absolute magnitude, color index, name)")
 print("[")
 
 
-def render(ra, dec, mag, ci, dist, name):
+def render(x, y, z, ra, dec, mag, absmag, ci, dist, name):
     # Takes ra/deg in degrees
     ra = float(ra)
     dec = float(dec)
     mag = float(mag)
+    x, y, z = float(x), float(y), float(z)
     name = re.sub(r'\s+', ' ', name)
     if name == 'Sol':
         return
 
-    distance = 1.0
-    ra_radians = math.radians(ra * 15)  # ra is in [0, 24], multiplying by 15 gives degrees in [0, 360]
-    dec_radians = math.radians(dec)
-    #print(f"ra_radians={ra_radians}, dec_radians={dec_radians}, dec={dec}, ra={ra}", file=sys.stderr)
-    x = distance * math.cos(dec_radians) * math.cos(-ra_radians)
-    y = distance * math.cos(dec_radians) * math.sin(-ra_radians)
-    z = distance * math.sin(dec_radians)
-
-    # Correct for differences in coordinate system axes
-    x, y, z = x, z, y
+#    distance = 1.0
+#    ra_radians = math.radians(ra * 15)  # ra is in [0, 24], multiplying by 15 gives degrees in [0, 360]
+#    dec_radians = math.radians(dec)
+#    #print(f"ra_radians={ra_radians}, dec_radians={dec_radians}, dec={dec}, ra={ra}", file=sys.stderr)
+#    x = distance * math.cos(dec_radians) * math.cos(-ra_radians)
+#    y = distance * math.cos(dec_radians) * math.sin(-ra_radians)
+#    z = distance * math.sin(dec_radians)
+#
+#    # Correct for differences in coordinate system axes
+#    x, y, z = x, z, y
 
     #brightness = 2.512 ** (0 - mag)
 
-    print(f'({x:.04},{y:.04},{z:.04},{mag:.04},{ci},{dist},"{name}"),')
+    print(f'({x:.04},{y:.04},{z:.04},{mag:.04},{absmag:.04},{ci},"{name}"),')
 
 
 def clean_name(string):
@@ -81,7 +82,11 @@ for entry in entries:
     total += 1
     ra = entry['ra']
     dec = entry['dec']
+    x = entry['x']
+    y = entry['y']
+    z = entry['z']
     mag = entry['mag']
+    absmag = entry['absmag']
     ci = entry['ci']
     dist = entry['dist']
     name = clean_name(entry['proper'])
@@ -94,7 +99,7 @@ for entry in entries:
         continue
     if float(mag) > MAX_APPARENT_MAGNITUDE:
         continue
-    render(ra, dec, mag, ci, dist, name)
+    render(x, y, z, ra, dec, mag, absmag, ci, dist, name)
     count += 1
 #for entry in CUSTOM_ENTRIES:
 #    render(entry[0], entry[1], entry[2], entry[3], entry[4])

src/world.rs

@@ -113,70 +113,54 @@ pub fn setup(
     commands.insert_resource(AsteroidModel2(asset_server.load(ASSET_ASTEROID2)));
 
     // Generate starmap
-    let sphere_handle = meshes.add(Circle::new(1.0));
+    let sphere_handle = meshes.add(Sphere::new(1.0).mesh().uv(16, 16));
     let mut starcount = 0;
     for star in nature::STARS {
-        let mag = star.3;
+        let (x, y, z, mag, absmag, color_index, name) = *star;
         if mag > STARS_MAX_MAGNITUDE {
             continue;
         }
-        let is_sun = mag < -20.0;
         let mag = mag.min(6.0);
         let scale_color = {|color: f32|
-            if is_sun {
-                color * 13.0f32
-            } else {
-                color * (0.0659663 * mag * mag - 1.09862 * mag + 4.3)
-            }
+            color * (0.0659663 * mag * mag - 1.09862 * mag + 4.3)
         };
-        let scale_size = {|mag: f32|
-            if is_sun {
-                40000.0f32
-            } else {
-                1000.0 * (0.230299 * mag * mag - 3.09013 * mag + 15.1782)
-            } * 1e11
-        };
-        let (r, g, b) = nature::star_color_index_to_rgb(star.4);
+        let (r, g, b) = nature::star_color_index_to_rgb(color_index);
         let star_color_handle = materials.add(StandardMaterial {
             base_color: Color::rgb(scale_color(r), scale_color(g), scale_color(b)),
             unlit: true,
             ..default()
         });
-        let mesh_distance = 1e18;
-        let starchart_distance = if is_sun {
-            Some(nature::DIST_JUPTER_SUN)
-        } else if star.5 >= 100000.0 {
-            None
-        } else {
-            Some(nature::PARSEC2METER * star.5 as f64)
-        };
         let name = if star.6.is_empty() {
             "Uncharted Star".to_string()
         } else {
             star.6.to_string()
         };
         let translation = Vec3::new(
-            mesh_distance * star.0,
-            mesh_distance * star.1,
-            mesh_distance * star.2,
+            nature::PARSEC2METER as f32 * x,
+            nature::PARSEC2METER as f32 * z,
+            nature::PARSEC2METER as f32 * -y,
         );
-        let rotation = Quat::from_rotation_arc(Vec3::Z, (-translation).normalize());
+        //let rotation = Quat::from_rotation_arc(Vec3::Z, (-translation).normalize());
+
+        let scale = translation.length().powf(0.85);
+
         commands.spawn((
             Star,
             hud::IsClickable {
                 name: Some(name),
-                distance: starchart_distance,
+                distance: None,
             },
             PbrBundle {
                 mesh: sphere_handle.clone(),
                 material: star_color_handle,
                 transform: Transform {
                     translation,
-                    rotation,
-                    scale: Vec3::splat(scale_size(mag)),
+                    scale: Vec3::splat(scale),
+                    ..default()
                 },
                 ..default()
-            }
+            },
+            Position::new(translation.as_dvec3()),
         ));
         starcount += 1;
     }