Augmented reality - XNA Models

#region File Description
//-----------------------------------------------------------------------------
// TeapotPrimitive.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#endregion

#region Using Statements
using System;
using System.Diagnostics;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
#endregion

namespace Primitives3D
{
    /// <summary>
    /// Geometric primitive class for drawing teapots.
    /// 
    /// This teapot model was created by Martin Newell and Jim Blinn in 1975.
    /// It consists of ten cubic bezier patches, a type of curved surface which
    /// can be tessellated to create triangles at various levels of detail. The
    /// use of curved surfaces allows a smoothly curved, visually interesting,
    /// and instantly recognizable shape to be specified by a tiny amount of
    /// data, which made the teapot a popular test data set for computer graphics
    /// researchers. It has been used in so many papers and demos that many
    /// graphics programmers have come to think of it as a standard geometric
    /// primitive, right up there with cubes and spheres!
    /// </summary>
    public class TeapotPrimitive : BezierPrimitive
    {
        /// <summary>
        /// Constructs a new teapot primitive, using default settings.
        /// </summary>
        public TeapotPrimitive(GraphicsDevice graphicsDevice)
            : this(graphicsDevice, 1, 8)
        {
        }


        /// <summary>
        /// Constructs a new teapot primitive,
        /// with the specified size and tessellation level.
        /// </summary>
        public TeapotPrimitive(GraphicsDevice graphicsDevice,
                               float size, int tessellation)
        {
            if (tessellation < 1)
                throw new ArgumentOutOfRangeException("tessellation");

            foreach (TeapotPatch patch in TeapotPatches)
            {
                // Because the teapot is symmetrical from left to right, we only store
                // data for one side, then tessellate each patch twice, mirroring in X.
                TessellatePatch(patch, tessellation, new Vector3(size, size, size));
                TessellatePatch(patch, tessellation, new Vector3(-size, size, size));

                if (patch.MirrorZ)
                {
                    // Some parts of the teapot (the body, lid, and rim, but not the
                    // handle or spout) are also symmetrical from front to back, so
                    // we tessellate them four times, mirroring in Z as well as X.
                    TessellatePatch(patch, tessellation, new Vector3(size, size, -size));
                    TessellatePatch(patch, tessellation, new Vector3(-size, size, -size));
                }
            }

            InitializePrimitive(graphicsDevice);
        }


        /// <summary>
        /// Tessellates the specified bezier patch.
        /// </summary>
        void TessellatePatch(TeapotPatch patch, int tessellation, Vector3 scale)
        {
            // Look up the 16 control points for this patch.
            Vector3[] controlPoints = new Vector3[16];

            for (int i = 0; i < 16; i++)
            {
                int index = patch.Indices[i];
                controlPoints[i] = TeapotControlPoints[index] * scale;
            }

            // Is this patch being mirrored?
            bool isMirrored = Math.Sign(scale.X) != Math.Sign(scale.Z);

            // Create the index and vertex data.
            CreatePatchIndices(tessellation, isMirrored);
            CreatePatchVertices(controlPoints, tessellation, isMirrored);
        }


        /// <summary>
        /// The teapot model consists of 10 bezier patches. Each patch has 16 control
        /// points, plus a flag indicating whether it should be mirrored in the Z axis
        /// as well as in X (all of the teapot is symmetrical from left to right, but
        /// only some parts are symmetrical from front to back). The control points
        /// are stored as integer indices into the TeapotControlPoints array.
        /// </summary>
        class TeapotPatch
        {
            public readonly int[] Indices;
            public readonly bool MirrorZ;


            public TeapotPatch(bool mirrorZ, int[] indices)
            {
                Debug.Assert(indices.Length == 16);

                this.Indices = indices;
                this.MirrorZ = mirrorZ;
            }
        }


        /// <summary>
        /// Static data array defines the bezier patches that make up the teapot.
        /// </summary>
        static TeapotPatch[] TeapotPatches =
        {
            // Rim.
            new TeapotPatch(true, new int[]
            {
                102, 103, 104, 105, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
            }),

            // Body.
            new TeapotPatch (true, new int[]
            { 
                12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27
            }),

            new TeapotPatch(true, new int[]
            { 
                24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40
            }),

            // Lid.
            new TeapotPatch(true, new int[]
            { 
                96, 96, 96, 96, 97, 98, 99, 100, 101, 101, 101, 101, 0, 1, 2, 3
            }),
            
            new TeapotPatch(true, new int[]
            {
                0, 1, 2, 3, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117
            }),

            // Handle.
            new TeapotPatch(false, new int[]
            {
                41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56
            }),

            new TeapotPatch(false, new int[]
            { 
                53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 28, 65, 66, 67
            }),

            // Spout.
            new TeapotPatch(false, new int[]
            { 
                68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83
            }),

            new TeapotPatch(false, new int[]
            { 
                80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95
            }),

            // Bottom.
            new TeapotPatch(true, new int[]
            { 
                118, 118, 118, 118, 124, 122, 119, 121,
                123, 126, 125, 120, 40, 39, 38, 37
            }),
        };


        /// <summary>
        /// Static array defines the control point positions that make up the teapot.
        /// </summary>
        static Vector3[] TeapotControlPoints = 
        {
            new Vector3(0f, 0.345f, -0.05f),
            new Vector3(-0.028f, 0.345f, -0.05f),
            new Vector3(-0.05f, 0.345f, -0.028f),
            new Vector3(-0.05f, 0.345f, -0f),
            new Vector3(0f, 0.3028125f, -0.334375f),
            new Vector3(-0.18725f, 0.3028125f, -0.334375f),
            new Vector3(-0.334375f, 0.3028125f, -0.18725f),
            new Vector3(-0.334375f, 0.3028125f, -0f),
            new Vector3(0f, 0.3028125f, -0.359375f),
            new Vector3(-0.20125f, 0.3028125f, -0.359375f),
            new Vector3(-0.359375f, 0.3028125f, -0.20125f),
            new Vector3(-0.359375f, 0.3028125f, -0f),
            new Vector3(0f, 0.27f, -0.375f),
            new Vector3(-0.21f, 0.27f, -0.375f),
            new Vector3(-0.375f, 0.27f, -0.21f),
            new Vector3(-0.375f, 0.27f, -0f),
            new Vector3(0f, 0.13875f, -0.4375f),
            new Vector3(-0.245f, 0.13875f, -0.4375f),
            new Vector3(-0.4375f, 0.13875f, -0.245f),
            new Vector3(-0.4375f, 0.13875f, -0f),
            new Vector3(0f, 0.007499993f, -0.5f),
            new Vector3(-0.28f, 0.007499993f, -0.5f),
            new Vector3(-0.5f, 0.007499993f, -0.28f),
            new Vector3(-0.5f, 0.007499993f, -0f),
            new Vector3(0f, -0.105f, -0.5f),
            new Vector3(-0.28f, -0.105f, -0.5f),
            new Vector3(-0.5f, -0.105f, -0.28f),
            new Vector3(-0.5f, -0.105f, -0f),
            new Vector3(0f, -0.105f, 0.5f),
            new Vector3(0f, -0.2175f, -0.5f),
            new Vector3(-0.28f, -0.2175f, -0.5f),
            new Vector3(-0.5f, -0.2175f, -0.28f),
            new Vector3(-0.5f, -0.2175f, -0f),
            new Vector3(0f, -0.27375f, -0.375f),
            new Vector3(-0.21f, -0.27375f, -0.375f),
            new Vector3(-0.375f, -0.27375f, -0.21f),
            new Vector3(-0.375f, -0.27375f, -0f),
            new Vector3(0f, -0.2925f, -0.375f),
            new Vector3(-0.21f, -0.2925f, -0.375f),
            new Vector3(-0.375f, -0.2925f, -0.21f),
            new Vector3(-0.375f, -0.2925f, -0f),
            new Vector3(0f, 0.17625f, 0.4f),
            new Vector3(-0.075f, 0.17625f, 0.4f),
            new Vector3(-0.075f, 0.2325f, 0.375f),
            new Vector3(0f, 0.2325f, 0.375f),
            new Vector3(0f, 0.17625f, 0.575f),
            new Vector3(-0.075f, 0.17625f, 0.575f),
            new Vector3(-0.075f, 0.2325f, 0.625f),
            new Vector3(0f, 0.2325f, 0.625f),
            new Vector3(0f, 0.17625f, 0.675f),
            new Vector3(-0.075f, 0.17625f, 0.675f),
            new Vector3(-0.075f, 0.2325f, 0.75f),
            new Vector3(0f, 0.2325f, 0.75f),
            new Vector3(0f, 0.12f, 0.675f),
            new Vector3(-0.075f, 0.12f, 0.675f),
            new Vector3(-0.075f, 0.12f, 0.75f),
            new Vector3(0f, 0.12f, 0.75f),
            new Vector3(0f, 0.06375f, 0.675f),
            new Vector3(-0.075f, 0.06375f, 0.675f),
            new Vector3(-0.075f, 0.007499993f, 0.75f),
            new Vector3(0f, 0.007499993f, 0.75f),
            new Vector3(0f, -0.04875001f, 0.625f),
            new Vector3(-0.075f, -0.04875001f, 0.625f),
            new Vector3(-0.075f, -0.09562501f, 0.6625f),
            new Vector3(0f, -0.09562501f, 0.6625f),
            new Vector3(-0.075f, -0.105f, 0.5f),
            new Vector3(-0.075f, -0.18f, 0.475f),
            new Vector3(0f, -0.18f, 0.475f),
            new Vector3(0f, 0.02624997f, -0.425f),
            new Vector3(-0.165f, 0.02624997f, -0.425f),
            new Vector3(-0.165f, -0.18f, -0.425f),
            new Vector3(0f, -0.18f, -0.425f),
            new Vector3(0f, 0.02624997f, -0.65f),
            new Vector3(-0.165f, 0.02624997f, -0.65f),
            new Vector3(-0.165f, -0.12375f, -0.775f),
            new Vector3(0f, -0.12375f, -0.775f),
            new Vector3(0f, 0.195f, -0.575f),
            new Vector3(-0.0625f, 0.195f, -0.575f),
            new Vector3(-0.0625f, 0.17625f, -0.6f),
            new Vector3(0f, 0.17625f, -0.6f),
            new Vector3(0f, 0.27f, -0.675f),
            new Vector3(-0.0625f, 0.27f, -0.675f),
            new Vector3(-0.0625f, 0.27f, -0.825f),
            new Vector3(0f, 0.27f, -0.825f),
            new Vector3(0f, 0.28875f, -0.7f),
            new Vector3(-0.0625f, 0.28875f, -0.7f),
            new Vector3(-0.0625f, 0.2934375f, -0.88125f),
            new Vector3(0f, 0.2934375f, -0.88125f),
            new Vector3(0f, 0.28875f, -0.725f),
            new Vector3(-0.0375f, 0.28875f, -0.725f),
            new Vector3(-0.0375f, 0.298125f, -0.8625f),
            new Vector3(0f, 0.298125f, -0.8625f),
            new Vector3(0f, 0.27f, -0.7f),
            new Vector3(-0.0375f, 0.27f, -0.7f),
            new Vector3(-0.0375f, 0.27f, -0.8f),
            new Vector3(0f, 0.27f, -0.8f),
            new Vector3(0f, 0.4575f, -0f),
            new Vector3(0f, 0.4575f, -0.2f),
            new Vector3(-0.1125f, 0.4575f, -0.2f),
            new Vector3(-0.2f, 0.4575f, -0.1125f),
            new Vector3(-0.2f, 0.4575f, -0f),
            new Vector3(0f, 0.3825f, -0f),
            new Vector3(0f, 0.27f, -0.35f),
            new Vector3(-0.196f, 0.27f, -0.35f),
            new Vector3(-0.35f, 0.27f, -0.196f),
            new Vector3(-0.35f, 0.27f, -0f),
            new Vector3(0f, 0.3075f, -0.1f),
            new Vector3(-0.056f, 0.3075f, -0.1f),
            new Vector3(-0.1f, 0.3075f, -0.056f),
            new Vector3(-0.1f, 0.3075f, -0f),
            new Vector3(0f, 0.3075f, -0.325f),
            new Vector3(-0.182f, 0.3075f, -0.325f),
            new Vector3(-0.325f, 0.3075f, -0.182f),
            new Vector3(-0.325f, 0.3075f, -0f),
            new Vector3(0f, 0.27f, -0.325f),
            new Vector3(-0.182f, 0.27f, -0.325f),
            new Vector3(-0.325f, 0.27f, -0.182f),
            new Vector3(-0.325f, 0.27f, -0f),
            new Vector3(0f, -0.33f, -0f),
            new Vector3(-0.1995f, -0.33f, -0.35625f),
            new Vector3(0f, -0.31125f, -0.375f),
            new Vector3(0f, -0.33f, -0.35625f),
            new Vector3(-0.35625f, -0.33f, -0.1995f),
            new Vector3(-0.375f, -0.31125f, -0f),
            new Vector3(-0.35625f, -0.33f, -0f),
            new Vector3(-0.21f, -0.31125f, -0.375f),
            new Vector3(-0.375f, -0.31125f, -0.21f),
        };
    }
}