3D Models and Meshes Asst. Prof. Rujchai Ung-arunyawee COE, KKU

3D Models Simply called Models a hierarchy of meshes, which can be rendered independently. mesh is a collection of interconnected vertices, along with some rendering information. XNA provides special classes to manipulatemodels and meshes: Model and ModelMesh.

Using 3D models in XNA Add existing item of the model file (.x or.fxb) to the project. Declare a model variable as a member of the game class. Load a model with content manager and assign it to the model variable. Draw each mesh in the model.

Adding a model file

Declare a model variable public class Game1 : Microsoft.Xna.Framework.Game { GraphicsDeviceManager graphics; ContentManager content; BasicEffect effect; VertexBuffer vertexBuffer; Model myModel; …………… }

Loading model In the LoadContent method myModel = Content.Load ("Cube");

Drawing model In the Draw method, run through all meshes in the model and draw each one foreach (ModelMesh mesh in myModel.Meshes) { // Draw the current mesh mesh.Draw(); }

Model Transformation foreach (ModelMesh mesh in myModel.Meshes) { foreach (BasicEffect eff in mesh.Effects) { eff.World *= Matrix.CreateScale(0.5f); eff.View = effect.View; eff.Projection = effect.Projection; eff.EnableDefaultLighting(); } mesh.Draw(); }