Remove unused render_body() function and FIXME comment

docs/planning/rendering-cleanup-plan.md

@@ -42,7 +42,7 @@ Remove all spacecraft texture-related code:
 - Update docs/rendering.md to remove spacecraft texture references
 - **PAUSE** for user review
 
-### Step 4: Remove Unused `render_body()` Function
+### Step 4: Remove Unused `render_body()` Function [COMPLETED]
 - Remove `render_body()` function from renderer.cpp (lines 359-371)
 - Remove function declaration from renderer.h (line 44)
 - Remove FIXME comment on line 357

docs/rendering.md

@@ -308,7 +308,6 @@ When a spacecraft is selected:
 - `get_initial_camera_distance(body, sim, render_state)` - Auto-position camera based on children distance
 
 #### Rendering
-- `render_body(body, render_state)` - Draw single celestial body
 - `render_maneuver_marker_screen_space(craft, maneuver, render_state)` - Draw burn indicator as 2D overlay
 - `render_simulation(sim, render_state)` - Full scene rendering (3D + 2D overlays)
 

docs/technical_reference.md

@@ -528,7 +528,6 @@ GUI-only application with interactive 3D visualization.
 2. `render_simulation()` → for each body:
    - `scale_position()` → convert to render coordinates using logarithmic scaling
    - `scale_radius()` → convert to render size using exponential scaling
-   - `render_body()` → draw sphere with color
 
 ### SOI Transition Mechanics
 - Bodies dynamically switch gravitational parents when crossing SOI boundaries

src/renderer.cpp

@@ -328,22 +328,6 @@ float scale_radius(double radius, double scale) {
     return (float)(radius * scale);
 }
 
-// FIXME: no longer used, can maybe re-use when refactoring render_simulation()
-// Render a single celestial body
-void render_body(CelestialBody* body, RenderState* render_state) {
-    Vector3 position = sim_to_render(body->global_position, render_state->distance_scale);
-    float radius = scale_radius(body->radius, render_state->size_scale);
-
-    Color color = {
-        (unsigned char)(body->color[0] * 255),
-        (unsigned char)(body->color[1] * 255),
-        (unsigned char)(body->color[2] * 255),
-        255
-    };
-
-    DrawSphereWires(position, radius, 16, 16, color);
-}
-
 void render_maneuver_marker_screen_space(Spacecraft* craft, Maneuver* maneuver, RenderState* render_state) {
     if (maneuver->executed) {
         return;

src/renderer.h

@@ -36,7 +36,6 @@ void update_camera(RenderState* render_state, SimulationState* sim);
 float get_initial_camera_distance(CelestialBody* body, SimulationState* sim, RenderState* render_state);
 
 // Rendering functions
-void render_body(CelestialBody* body, RenderState* render_state);
 void render_maneuver_marker_screen_space(Spacecraft* craft, Maneuver* maneuver, RenderState* render_state);
 void render_orbit(Vec3 position, Vec3 velocity, Vec3 parent_position, double parent_mass, Color orbit_color, RenderState* render_state);
 Color get_body_orbit_color(CelestialBody* body);