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diff --git a/libdimension/dimension/model/finish.h b/libdimension/dimension/model/finish.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
+ * Object finishes.
+ */
+
+/* Ambient component */
+
+/** Ambient finish component. */
+typedef struct dmnsn_ambient {
+  dmnsn_color ambient; /**< Ambient light. */
+} dmnsn_ambient;
+
+/** Allocate an ambient component. */
+dmnsn_ambient *dmnsn_new_ambient(dmnsn_pool *pool, dmnsn_color ambient);
+
+/* Diffuse component */
+
+typedef struct dmnsn_diffuse dmnsn_diffuse;
+
+/**
+ * Diffuse reflection callback.
+ * @param[in] diffuse  The diffuse object itself.
+ * @param[in] light    The color of the light illuminating the object.
+ * @param[in] color    The pigment of the object.
+ * @param[in] ray      The direction of the light source.
+ * @param[in] normal   The normal vector of the surface.
+ * @return The diffuse reflection component of the object's color.
+ */
+typedef dmnsn_color dmnsn_diffuse_fn(const dmnsn_diffuse *diffuse,
+                                     dmnsn_color light, dmnsn_color color,
+                                     dmnsn_vector ray, dmnsn_vector normal);
+
+/** Diffuse finish component. */
+struct dmnsn_diffuse {
+  dmnsn_diffuse_fn *diffuse_fn; /**< Diffuse callback. */
+};
+
+/** Allocate a dummy diffuse component. */
+dmnsn_diffuse *dmnsn_new_diffuse(dmnsn_pool *pool);
+/** Initialize a dmnsn_diffuse field. */
+void dmnsn_init_diffuse(dmnsn_diffuse *diffuse);
+
+/* Specular component */
+
+typedef struct dmnsn_specular dmnsn_specular;
+
+/**
+ * Specular highlight callback.
+ * @param[in] specular  The specular object itself.
+ * @param[in] light     The color of the light illuminating the object.
+ * @param[in] color     The pigment of the object.
+ * @param[in] ray       The direction of the light source.
+ * @param[in] normal    The normal vector of the surface.
+ * @param[in] viewer    The direction of the viewer.
+ * @return The specular reflection component of the object's color.
+ */
+typedef dmnsn_color dmnsn_specular_fn(const dmnsn_specular *specular,
+                                      dmnsn_color light, dmnsn_color color,
+                                      dmnsn_vector ray, dmnsn_vector normal,
+                                      dmnsn_vector viewer);
+
+/** Specular finish component. */
+struct dmnsn_specular {
+  dmnsn_specular_fn *specular_fn; /**< Specular callback. */
+};
+
+/** Allocate a dummy specular component. */
+dmnsn_specular *dmnsn_new_specular(dmnsn_pool *pool);
+/** Initialize a dmnsn_specular field. */
+void dmnsn_init_specular(dmnsn_specular *specular);
+
+/* Reflection component */
+
+typedef struct dmnsn_reflection dmnsn_reflection;
+
+/**
+ * Reflected light callback.
+ * @param[in] reflection  The reflection object itself.
+ * @param[in] reflect     The color of the reflected ray.
+ * @param[in] color       The pigment of the object.
+ * @param[in] ray         The direction of the reflected ray.
+ * @param[in] normal      The normal vector of the surface.
+ * @return The contribution of the reflected ray to the object's color.
+ */
+typedef dmnsn_color dmnsn_reflection_fn(const dmnsn_reflection *reflection,
+                                        dmnsn_color reflect, dmnsn_color color,
+                                        dmnsn_vector ray, dmnsn_vector normal);
+
+/** The reflection component. */
+struct dmnsn_reflection {
+  dmnsn_reflection_fn *reflection_fn; /**< Reflection callback. */
+};
+
+/** Allocate a dummy reflection component. */
+dmnsn_reflection *dmnsn_new_reflection(dmnsn_pool *pool);
+/** Initialize a dmnsn_reflection field. */
+void dmnsn_init_reflection(dmnsn_reflection *reflection);
+
+/* Entire finishes */
+
+/** A finish. */
+typedef struct dmnsn_finish {
+  dmnsn_ambient *ambient; /**< Ambient component. */
+  dmnsn_diffuse *diffuse; /**< Diffuse component. */
+  dmnsn_specular *specular; /**< Specular component. */
+  dmnsn_reflection *reflection; /**< Reflection component. */
+} dmnsn_finish;
+
+/**
+ * Create a new blank finish.
+ * @return The new finish.
+ */
+dmnsn_finish dmnsn_new_finish(void);
+
+/**
+ * Fill missing finish properties from a default finish.
+ * @param[in]     default_finish  The default finish.
+ * @param[in,out] finish          The finish to fill.
+ */
+void dmnsn_finish_cascade(const dmnsn_finish *default_finish,
+                          dmnsn_finish *finish);