From f53e840ecdaf925e6e4584900aeeb298dd588442 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Fri, 4 May 2012 22:47:43 +0200
Subject: [PATCH] Camera must be attached to scene when attempting to draw.

---
 src/Camera.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Camera.cpp b/src/Camera.cpp
index 199d2cfc8..5dc595899 100644
--- a/src/Camera.cpp
+++ b/src/Camera.cpp
@@ -106,11 +106,14 @@ void Camera::setClearColor(const Magnum::Vector4& color) {
 }
 
 void Camera::draw() {
+    Scene* s = scene();
+    CORRADE_ASSERT(s, "Camera: cannot draw without camera attached to scene", )
+
     /** @todo Clear only set features */
     glClear(GL_COLOR_BUFFER_BIT|GL_STENCIL_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 
     /* Recursively draw child objects */
-    drawChildren(scene(), cameraMatrix());
+    drawChildren(s, cameraMatrix());
 }
 
 void Camera::drawChildren(Object* object, const Matrix4& transformationMatrix) {