BEPUphysics

hi every one i'm new in bepu and xna
i'm trying to make my first step in bepu, i'm using xna4 and the newer version of bepu 0.16 , what i want to do is put one box(entity) and attach a cube model to it , then when game is running i want the etity falling to the ground , actualy i'm try to do that but the entity still in it's position whitout falling on the ground , i was attach the model with entity position (using the world matrix) . and i was also write a code for static mesh (ground) for collision with that box , here is my code:

using BEPUphysics;
using BEPUphysics.DataStructures;
using BEPUphysics.Entities;
using BEPUphysics.Collidables;
using BEPUphysics.MathExtensions;
using BEPUphysics.Entities.Prefabs;

// variable
Space space;
Vector3 cubeBoxPos;

// load content
cube = Content.Load<Model>("E/cube");
space = new Space();
space.ForceUpdater.Gravity = new Vector3(0, -9.8f, 0);
Vector3[] vertices;
int[] indices;
TriangleMesh.GetVerticesAndIndicesFromModel(ground_w_d, out vertices, out indices);
var mesh_level = new StaticMesh(vertices, indices, new AffineTransform(new Vector3(0, 0, 0)));
Box cubeBox;
cubeBoxPos = new Vector3(0, 20, 20);
cubeBox = new Box(cubeBoxPos, 1, 1, 1, 1);
space.Add(cubeBox);
space.Add(mesh_level);
// update
space.Update();
System.Diagnostics.Debug.WriteLine(cubeBoxPos);// to know the position of box entity

where is the wrong ?
thanx for any one need to help.

Nothing immediately jumps out as obviously wrong. I'd recommend comparing your project to the BasicSetupDemo and GettingStartedDemo (http://bepuphysics.codeplex.com/wikipag ... umentation), which includes some basic simulation setup and very basic rendering.

It could just be that the graphic is not being moved correctly with the entity.

i do a compare before and i don't know what the problem is . i know that the entity box still in it's position because the code "System.Diagnostics.Debug.WriteLine(cubeBoxPos);" tell me the position of box entity .any idea?

That line just outputs the cubeBoxPos variable, not the cubeBox.Position property. The variable won't change when the entity's position changes.

thanx norbo that's right .... . Position