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diff --git a/libdimension/dimension/model/pigment.h b/libdimension/dimension/model/pigment.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 pigments.
+ */
+
+/* Forward-declare dmnsn_pigment */
+typedef struct dmnsn_pigment dmnsn_pigment;
+
+/**
+ * Pigment callback.
+ * @param[in] pigment  The pigment itself.
+ * @param[in] v        The point to color.
+ * @return The color of the pigment at \p v.
+ */
+typedef dmnsn_tcolor dmnsn_pigment_fn(const dmnsn_pigment *pigment,
+                                      dmnsn_vector v);
+
+/**
+ * Pigment initializer callback.
+ * @param[in,out] pigment  The pigment to initialize.
+ */
+typedef void dmnsn_pigment_initialize_fn(dmnsn_pigment *pigment);
+
+/** A pigment. */
+struct dmnsn_pigment {
+  dmnsn_pigment_fn *pigment_fn; /**< The pigment callback. */
+  dmnsn_pigment_initialize_fn *initialize_fn; /**< The initializer callback. */
+
+  dmnsn_matrix trans; /**< Transformation matrix. */
+  dmnsn_matrix trans_inv; /**< The inverse of the transformation matrix. */
+
+  /** Quick color -- used for low-quality renders. */
+  dmnsn_tcolor quick_color;
+
+  bool initialized; /** @internal Whether the pigment is initialized. */
+};
+
+/**
+ * Allocate a new dummy pigment.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return The allocated pigment.
+ */
+dmnsn_pigment *dmnsn_new_pigment(dmnsn_pool *pool);
+
+/**
+ * Initialize a dmnsn_pigment field.
+ * @param[out] pigment  The pigment to initialize.
+ */
+void dmnsn_init_pigment(dmnsn_pigment *pigment);
+
+/**
+ * Initialize a pigment.  Pigments should not be used before being initialized,
+ * but should not be modified after being initialized.  Pigments are generally
+ * initialized for you.
+ * @param[in,out] pigment  The pigment to initialize.
+ */
+void dmnsn_pigment_initialize(dmnsn_pigment *pigment);
+
+/**
+ * Evaluate the color of a pigment at a point.
+ * @param[in] pigment  The pigment to evaluate.
+ * @param[in] v        The point to color.
+ * @return The color at \p v.
+ */
+dmnsn_tcolor dmnsn_pigment_evaluate(const dmnsn_pigment *pigment,
+                                    dmnsn_vector v);