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diff --git a/libdimension/dimension/model/camera.h b/libdimension/dimension/model/camera.h
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+/*************************************************************************
+ * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Cameras.
+ */
+
+/* Forward-declare dmnsn_camera */
+typedef struct dmnsn_camera dmnsn_camera;
+
+/**
+ * Camera ray callback.
+ * @param[in] camera  The camera itself.
+ * @param[in] x       The x coordinate of the pixel (in [0, 1]).
+ * @param[in] y       The y coordinate of the pixel (in [0, 1]).
+ * @return The ray through (\p x, \p y).
+ */
+typedef dmnsn_ray dmnsn_camera_ray_fn(const dmnsn_camera *camera, double x, double y);
+
+/** A camera. */
+struct dmnsn_camera {
+  /* Callback functions */
+  dmnsn_camera_ray_fn *ray_fn; /**< Camera ray callback. */
+
+  dmnsn_matrix trans; /**< Transformation matrix. */
+};
+
+/**
+ * Create a dummy camera.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return The allocated camera.
+ */
+dmnsn_camera *dmnsn_new_camera(dmnsn_pool *pool);
+
+/**
+ * Initialize a dmnsn_camera field.
+ * @param[out] camera  The camera to initialize.
+ */
+void dmnsn_init_camera(dmnsn_camera *camera);
+
+/**
+ * Invoke the camera ray callback, then correctly transform the ray.
+ * @param[in] camera  The camera itself.
+ * @param[in] x       The x coordinate of the pixel (in [0, 1]).
+ * @param[in] y       The y coordinate of the pixel (in [0, 1]).
+ * @return The ray through (\p x, \p y).
+ */
+dmnsn_ray dmnsn_camera_ray(const dmnsn_camera *camera, double x, double y);