diff --git a/docs/rendering.md b/docs/rendering.md
index 32041f2..b441cbc 100644
--- a/docs/rendering.md
+++ b/docs/rendering.md
@@ -59,22 +59,33 @@ Uses linear scaling for consistent representation at all scales.
 ## Camera System
 
 ### Camera Setup
-- Position: (0, 50, 100) initially
+- Position: (0, CAMERA_INITIAL_POSITION_Y, CAMERA_INITIAL_POSITION_Z) initially
 - Target: Origin (0, 0, 0)
 - Up vector: (0, 1, 0)
-- FOV: 45 degrees
+- FOV: CAMERA_INITIAL_FOV (45 degrees)
 - Projection: Perspective
 
+### Camera Control Constants
+- **Orbit rotation speed:** CAMERA_ORBIT_ANGLE_SPEED (0.02 radians per keypress)
+- **Zoom percentage:** ZOOM_PERCENTAGE (7% of current distance per keypress)
+- **Zoom delta limits:** ZOOM_MIN_DELTA (0.05) to ZOOM_MAX_DELTA (5.0)
+- **Initial height factor:** CAMERA_INITIAL_HEIGHT_FACTOR (0.3)
+- **Minimum distance fallback:** CAMERA_MIN_DISTANCE (0.1 for no target)
+
 ### Camera Controls
 **Arrow Keys:**
 - Left/Right: Orbit around target (horizontal rotation)
 - Up/Down: Zoom in/out (preserve viewing angle)
+- Zoom speed is percentage-based: faster when far, slower when close
+- Zoom delta clamped to prevent too-slow or too-fast movement
 
 **Camera Follow Mode:**
-- Tracks selected body or spacecraft
+- Tracks selected body only (spacecraft selection handled by UI)
+- When spacecraft selected, camera follows spacecraft's parent body
 - Preserves relative offset when following
 - Updates target position each frame to follow moving objects
 - Maintains camera distance when switching between bodies
+- Initial camera position accounts for body size when switching targets
 
 **Camera Rotation Logic:**
 - Uses camera's up vector for horizontal orbit
@@ -83,8 +94,9 @@ Uses linear scaling for consistent representation at all scales.
 
 **Follow State Transitions:**
 1. **Enable follow**: Store current offset from target
-2. **Body switch**: Recalculate offset to maintain distance
+2. **Body switch**: Recalculate offset using get_initial_camera_distance()
 3. **Frame update**: Move camera to maintain offset from moving target
+4. **Spacecraft selection**: Camera focuses on spacecraft's parent body
 
 ## Object Rendering