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diff --git a/libdimension/dimension/model/objects.h b/libdimension/dimension/model/objects.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
+ * Pre-defined objects.
+ */
+
+#include <stdbool.h>
+
+/**
+ * A flat triangle.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] vertices  The corners of the triangle.
+ * @return A triangle.
+ */
+dmnsn_object *dmnsn_new_triangle(dmnsn_pool *pool, dmnsn_vector vertices[3]);
+
+/**
+ * A triangle, with normals interpolated between the points.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] vertices  The corners of the triangle.
+ * @param[in] normals  The normals at each corner.
+ * @return A smooth triangle.
+ */
+dmnsn_object *dmnsn_new_smooth_triangle(dmnsn_pool *pool, dmnsn_vector vertices[3], dmnsn_vector normals[3]);
+
+/**
+ * A triangle fan.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] vertices  The vertices of the fan, starting in the center.
+ * @param[in] nvertices  The number of vertices.
+ * @return A triangle fan.
+ */
+dmnsn_object *dmnsn_new_triangle_fan(dmnsn_pool *pool, dmnsn_vector vertices[], size_t nvertices);
+
+/**
+ * A smooth triangle fan.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] vertices  The vertices of the fan, starting in the center.
+ * @param[in] normals  The normal vector for each vertex.
+ * @param[in] nvertices  The number of vertices.
+ * @return A triangle fan.
+ */
+dmnsn_object *dmnsn_new_smooth_triangle_fan(dmnsn_pool *pool, dmnsn_vector vertices[], dmnsn_vector normals[], size_t nvertices);
+
+/**
+ * A plane.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] normal  The normal vector of the plane.
+ * @return A plane through the origin, with the given normal.
+ */
+dmnsn_object *dmnsn_new_plane(dmnsn_pool *pool, dmnsn_vector normal);
+
+/**
+ * A sphere.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return A sphere of radius 1, centered at the origin.
+ */
+dmnsn_object *dmnsn_new_sphere(dmnsn_pool *pool);
+
+/**
+ * A cube.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return An axis-aligned cube, from (-1, -1, -1) to (1, 1, 1).
+ */
+dmnsn_object *dmnsn_new_cube(dmnsn_pool *pool);
+
+/**
+ * A cylinder/cone.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] r1    The bottom radius.
+ * @param[in] r2    The top radius.
+ * @param[in] open  Whether to render caps.
+ * @return A cone slice, from r = \p r1 at y = -1, to r = \p r2 at y = 1
+ */
+dmnsn_object *dmnsn_new_cone(dmnsn_pool *pool, double r1, double r2, bool open);
+
+/**
+ * A torus.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] major  The major radius.
+ * @param[in] minor  The minor radius.
+ * @return A torus, centered at the origin and lying in the x-z plane.
+ */
+dmnsn_object *dmnsn_new_torus(dmnsn_pool *pool, double major, double minor);