Fix render scaling to match simulation coordinates

🤖 Generated with Claude Code - Co-Authored-By: Claude Sonnet 4.5

src/renderer.cpp

@@ -22,9 +22,9 @@ void setup_camera(RenderState* render_state) {
     render_state->camera.fovy = 45.0f;
     render_state->camera.projection = CAMERA_PERSPECTIVE;
 
-    // Set scaling factors
+    // Set scaling factors (same scale for distances and sizes)
     render_state->distance_scale = 1e-9;  // Meters to scaled units (1 unit = 1 billion meters)
-    render_state->size_scale = 5e-7;      // Make bodies visible
+    render_state->size_scale = 1e-9;      // Same scale for body sizes (minimum size still applies)
     render_state->show_info = true;
 }
 
@@ -92,19 +92,10 @@ void render_body(CelestialBody* body, RenderState* render_state) {
     Vector3 position = sim_to_render(body->position, render_state->distance_scale);
     float radius = scale_radius(body->radius, render_state->size_scale);
 
-    float r = body->color[0];
-    float g = body->color[1];
-    float b = body->color[2];
-
-    if (body->parent_index == -1) {
-        float gray = (r + g + b) / 3.0f * 0.3f;
-        r = g = b = gray;
-    }
-
     Color color = {
-        (unsigned char)(r * 255),
+        (unsigned char)(body->color[0] * 255),
-        (unsigned char)(g * 255),
+        (unsigned char)(body->color[1] * 255),
-        (unsigned char)(b * 255),
+        (unsigned char)(body->color[2] * 255),
         255
     };