XNA 中3D模型的显示

 XNA 中3D模型的显示：

        ModelMeshPart[] meshParts;

        Model start_model;

        Matrix[] dq_model_transforms;

　　 Matrix view = Matrix.CreateLookAt(new Vector3(72.93132f, 67.70515f, 101.329f), new Vector3(7.16512f, 66.22025f, 5.214687f), new Vector3(-0.01481795f, 0.9998762f, -0.0053083f));

        Matrix projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(88f), 800f / 600f, 0.1f, 1000000f);

        Matrix[] dq_transforms;

        Dictionary<string, Matrix> dq_transforms_d = new Dictionary<string, Matrix>();

        Dictionary<string, ModelMeshPart> dq_ModelMeshPart_d = new Dictionary<string, ModelMeshPart>();

       public void add_Set_model(string model_name)

        {

            Model model = contentManager.Load<Model>(model_name);

            start_model = model;

            Set_mesh(start_model, model_name);

        }

        public void Set_mesh(Model model, string model_name)

        {

            dq_transforms = new Matrix[model.Bones.Count];

            model.CopyAbsoluteBoneTransformsTo(dq_transforms);

            //dq_model_transforms = dq_transforms;

            foreach (ModelMesh mesh in model.Meshes)

            {

                if (!dq_transforms_d.ContainsKey(mesh.Name))

                {

                    dq_transforms_d.Add(mesh.Name, dq_transforms[mesh.ParentBone.Index]);

                }

                //dq_model_transforms_All.Add(dq_model_transforms);

                foreach (ModelMeshPart part in mesh.MeshParts)

                {

                    if (!dq_ModelMeshPart_d.ContainsKey(mesh.Name))

                    {

                        dq_ModelMeshPart_d.Add(mesh.Name, part);

                    }

                }

            }

        }

        protected override void Draw()

        {

            Color backColor = new Color(BackColor.R, BackColor.G, BackColor.B);

            GraphicsDevice.Clear(Color.Black);

            #region ModelMeshPart画模型

            //foreach (Effect effect_ls in mesh.Effects)

            foreach (var dq_part in dq_ModelMeshPart_d)

            {

                //dq_part.Value.Effect

                BasicEffect myBasicEffect = dq_part.Value.Effect as BasicEffect;

                //dq_transforms_d[dq_part.Key]

                myBasicEffect.World = dq_transforms_d[dq_part.Key];

                myBasicEffect.View = view;

                myBasicEffect.Projection = projection;

                myBasicEffect.EnableDefaultLighting();

                myBasicEffect.PreferPerPixelLighting = true;

                myBasicEffect.SpecularPower = 16;

                //获取或设置活动技术。  获取此渲染技术所需的EffectPass对象的集合。 开始这个

                myBasicEffect.CurrentTechnique.Passes[0].Apply();

                GraphicsDevice.Indices = dq_part.Value.IndexBuffer;

                GraphicsDevice.SetVertexBuffer(dq_part.Value.VertexBuffer);

                GraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, dq_part.Value.VertexOffset, 0, dq_part.Value.NumVertices, dq_part.Value.StartIndex, dq_part.Value.PrimitiveCount);

            }

            #endregion

           #region model.Draw画模型

            //foreach (ModelMesh mesh in start_model.Meshes)

            //{

            //    foreach (Effect effect_ls in mesh.Effects)

            //    {

            //        Type effects_type = effect_ls.GetType();

            //        if (effects_type.Name == "BasicEffect")

            //        {

            //            BasicEffect effect = (BasicEffect)effect_ls;

            //            effect.World = dq_model_transforms[mesh.ParentBone.Index];

            //            effect.View = view;

            //            effect.Projection = projection;

            //            effect.EnableDefaultLighting();

            //            effect.PreferPerPixelLighting = true;

            //            effect.SpecularPower = 16;

            //        }

            //    }

            //    if (!line_mode_flag)

            //    {

            //        mesh.Draw();

            //    }

            //    else

            //    {

            //        foreach (ModelMeshPart part in mesh.MeshParts)

            //        {

            //            BasicEffect myBasicEffect = part.Effect as BasicEffect;

            //            myBasicEffect.World = dq_model_transforms[mesh.ParentBone.Index];

            //            //myBasicEffect.View = view;

            //            //myBasicEffect.Projection = projection;

            //            // myBasicEffect.TextureEnabled = true;

            //            myBasicEffect.CurrentTechnique.Passes[0].Apply();

            //            //myBasicEffect.Alpha = dq_Alpha;

            //            GraphicsDevice.Indices = part.IndexBuffer;

            //            GraphicsDevice.SetVertexBuffer(part.VertexBuffer);

            //            GraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleStrip, part.VertexOffset, 0, part.NumVertices, part.StartIndex, part.PrimitiveCount);

            //        } 

            //    }

　　　　 #endregion

            }

        }

    }

}

 注：Model model = contentManager.Load<Model>(model_name);  通过content的Load方法从content中加载.xnb的模型，另外，BasicEffect 内的各个参数在用的时候有一定的顺序之分......