Used mass to calculate orbital speed. Added phobos.

punyverse/_model.c

@@ -1,4 +1,4 @@
-/* Generated by Cython 0.18 on Sat Oct 26 13:44:10 2013 */
+/* Generated by Cython 0.18 on Sat Oct 26 16:08:45 2013 */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
@@ -9084,22 +9084,52 @@ static int __pyx_f_9punyverse_6_model_model_list(struct __pyx_obj_9punyverse_6_m
  *                 point(f, model, tex_id, sx, sy, sz, 0)
  *         glEnd()             # <<<<<<<<<<<<<<
  * 
- *     glPopAttrib()
+ *         if tex_id:
  */
     glEnd();
-  }
-  __Pyx_DECREF(__pyx_t_10); __pyx_t_10 = 0;
 
     /* "punyverse\_model.pyx":341
  *         glEnd()
  * 
+ *         if tex_id:             # <<<<<<<<<<<<<<
+ *             glBindTexture(GL_TEXTURE_2D, 0)
+ *             glDisable(GL_TEXTURE_2D)
+ */
+    if (__pyx_v_tex_id) {
+
+      /* "punyverse\_model.pyx":342
+ * 
+ *         if tex_id:
+ *             glBindTexture(GL_TEXTURE_2D, 0)             # <<<<<<<<<<<<<<
+ *             glDisable(GL_TEXTURE_2D)
+ * 
+ */
+      glBindTexture(__pyx_e_9punyverse_6_model_GL_TEXTURE_2D, 0);
+
+      /* "punyverse\_model.pyx":343
+ *         if tex_id:
+ *             glBindTexture(GL_TEXTURE_2D, 0)
+ *             glDisable(GL_TEXTURE_2D)             # <<<<<<<<<<<<<<
+ * 
+ *     glPopAttrib()
+ */
+      glDisable(__pyx_e_9punyverse_6_model_GL_TEXTURE_2D);
+      goto __pyx_L25;
+    }
+    __pyx_L25:;
+  }
+  __Pyx_DECREF(__pyx_t_10); __pyx_t_10 = 0;
+
+  /* "punyverse\_model.pyx":345
+ *             glDisable(GL_TEXTURE_2D)
+ * 
  *     glPopAttrib()             # <<<<<<<<<<<<<<
  *     glPopMatrix()
  * 
  */
   glPopAttrib();
 
-  /* "punyverse\_model.pyx":342
+  /* "punyverse\_model.pyx":346
  * 
  *     glPopAttrib()
  *     glPopMatrix()             # <<<<<<<<<<<<<<
@@ -9108,7 +9138,7 @@ static int __pyx_f_9punyverse_6_model_model_list(struct __pyx_obj_9punyverse_6_m
  */
   glPopMatrix();
 
-  /* "punyverse\_model.pyx":344
+  /* "punyverse\_model.pyx":348
  *     glPopMatrix()
  * 
  *     glEndList()             # <<<<<<<<<<<<<<
@@ -9116,7 +9146,7 @@ static int __pyx_f_9punyverse_6_model_model_list(struct __pyx_obj_9punyverse_6_m
  */
   glEndList();
 
-  /* "punyverse\_model.pyx":345
+  /* "punyverse\_model.pyx":349
  * 
  *     glEndList()
  *     return display             # <<<<<<<<<<<<<<

punyverse/_model.pyx

@@ -338,6 +338,10 @@ cpdef int model_list(WavefrontObject model, float sx=1, float sy=1, float sz=1,
                 point(f, model, tex_id, sx, sy, sz, 0)
         glEnd()
 
+        if tex_id:
+            glBindTexture(GL_TEXTURE_2D, 0)
+            glDisable(GL_TEXTURE_2D)
+
     glPopAttrib()
     glPopMatrix()
 

punyverse/assets/models/satellites/phobos.mtl

@@ -0,0 +1,20 @@
+# Ns = Phong specular component. Ranges from 0 to 1000. (I've seen various statements about this range (see below))
+# Kd = Diffuse color weighted by the diffuse coefficient.
+# Ka = Ambient color weighted by the ambient coefficient.
+# Ks = Specular color weighted by the specular coefficient.
+# d = Dissolve factor (pseudo-transparency). Values are from 0-1. 0 is completely transparent, 1 is opaque.
+# Ni = Refraction index. Values range from 1 upwards. A value of 1 will cause no refraction. A higher value implies refraction.
+# illum = (0, 1, or 2) 0 to disable lighting, 1 for ambient & diffuse only (specular color set to black), 2 for full lighting (see below)
+# sharpness = ? (see below)
+# c
+# map_Bump = Bump texture map.
+# map_d = Opacity texture map.
+# refl = reflection type and filename (?)
+
+newmtl white
+Ka 1 1 1
+Kd 1 1 1
+Ks 0 0 0
+map_Kd phobos.jpg
+illum 2
+Ns 8

punyverse/entity.py

@@ -35,6 +35,7 @@ class Planet(Entity):
         self.atmosphere = kwargs.pop('atmosphere', 0)
         self.cloudmap = kwargs.pop('cloudmap', 0)
         self.last_tick = 0
+        self.mass = kwargs.pop('mass', None)
         super(Planet, self).__init__(*args, **kwargs)
 
     def update(self):

punyverse/world.json

@@ -1,5 +1,9 @@
 {
+  "au": "greatly shrunk so planets can actually be seen",
   "au": 10000,
+  "tick": 4320,
+  "length": "kilometre per world units for satellite distance, note that this is approx 10x smaller than AU",
+  "length": 637,
   "planets": {
     "earth": {
       "texture": ["earth.jpg", "earth_medium.jpg", "earth_small.jpg", [0, 0.28, 1, 1]],
@@ -8,6 +12,7 @@
       "pitch": -90,
       "yaw": 23.4,
       "roll": -90,
+      "mass": 5.97219e+24,
       "atmosphere": {
         "cloud_texture": "cloudmap.png",
         "diffuse_texture": "atmosphere_earth.png",
@@ -17,8 +22,7 @@
         "moon": {
           "texture": ["moon.jpg", "moon_medium.jpg", "moon_small.jpg", [0.53, 0.53, 0.53, 1]],
           "radius": 27.25,
-          "distance": 603.357,
-          "orbit_speed": 1,
+          "distance": 384399,
           "eccentricity": 0.0549,
           "inclination": 5.145,
           "pitch": -90,
@@ -27,7 +31,7 @@
         "iss": {
           "model": "satellites/iss.obj",
           "inclination": 51.65,
-          "distance": 110,
+          "distance": 68000,
           "scale": 5
         }
       }
@@ -37,7 +41,14 @@
       "radius": 53.3,
       "z": "1.524 * AU",
       "pitch": -90,
-      "yaw": 25.19
+      "yaw": 25.19,
+      "mass": 6.4185e+23,
+      "satellites": {
+        "phobos": {
+          "distance": 93770,
+          "model": "satellites/phobos.obj"
+        }
+      }
     },
     "jupiter": {
       "texture": ["jupiter.jpg", "jupiter_medium.jpg", "jupiter_small.jpg", [0.65, 0.36, 0.19, 1]],

punyverse/world.py

@@ -1,10 +1,6 @@
-from bisect import bisect_left
 from collections import OrderedDict
-from operator import itemgetter
 from functools import partial
-import hashlib
 import os.path
-import random
 
 try:
     import json
@@ -23,7 +19,9 @@ from punyverse.glgeom import *
 from punyverse.entity import *
 from punyverse.texture import *
 
-AU = 2000
+from math import pi, sqrt
+
+G = 6.67384e-11  # Gravitation Constant
 
 
 def get_best_texture(info, optional=False):
@@ -62,6 +60,8 @@ def load_world(file):
 
         world = World()
         e = lambda x: eval(str(x), {'__builtins__': None}, {'AU': root.get('au', 2000)})
+        tick = root.get('tick', 4320)  # How many second is a tick?
+        length = root.get('length', 4320)  # Satellite distance is in km, divide by this gets in world units
 
         if 'start' in root:
             info = root['start']
@@ -95,23 +95,31 @@ def load_world(file):
                 else:
                     object_id = compile(sphere, radius, int(radius / 2), int(radius / 2), texture, lighting=lighting)
             elif 'model' in info:
-                scale = info.get('scale', 10)
+                scale = info.get('scale', 1)
                 object_id = model_list(load_model(info['model']), info.get('sx', scale), info.get('sy', scale),
                                        info.get('sz', scale), (0, 0, 0))
             else:
                 print 'Nothing to load for %s.' % name
 
+            params = {}
             if parent is None:
                 type = Planet
             else:
                 x, y, z = parent.location
-                distance = e(info.get('distance', 100))
-                x -= distance
-                type = partial(Satellite, parent=parent, orbit_speed=info.get('orbit_speed', 1),
-                               distance=distance, eccentricity=info.get('eccentricity', 0),
+                distance = e(info.get('distance', 100))  # Distance here means semi-major axis
+                if hasattr(parent, 'mass') and parent.mass is not None:
+                    speed = 360 / (2 * pi * sqrt((distance * 1000) ** 3 / (G * parent.mass)) / tick)
+                else:
+                    speed = info.get('orbit_speed', 1)
+                type = Satellite
+                params.update(parent=parent, orbit_speed=speed,
+                              distance=distance / length, eccentricity=info.get('eccentricity', 0),
                               inclination=info.get('inclination', 0), longitude=info.get('longitude', 0),
                               argument=info.get('argument', 0))
 
+            if 'mass' in info:
+                params['mass'] = info['mass']
+
             atmosphere_id = 0
             cloudmap_id = 0
             if 'atmosphere' in info:
@@ -128,7 +136,7 @@ def load_world(file):
                     atmosphere_id = compile(disk, radius, radius + size, 30, atm_texture)
 
             object = type(object_id, (x, y, z), (pitch, yaw, roll), delta=delta,
-                          atmosphere=atmosphere_id, cloudmap=cloudmap_id, background=background)
+                          atmosphere=atmosphere_id, cloudmap=cloudmap_id, background=background, **params)
             world.tracker.append(object)
 
             if 'ring' in info: