Has anybody managed to get some collision in the game?

[Jonotron]

So has anybody got collision in yet?  I'm really eager to figure out how this works.

[Nemo Krad]

Yes using bounding box's and spheres you can use the Intersects method to determine if two models collide.

[Jonotron]

Thanks!  I've googled a bit on that, and there's lots of help . What I'm confused is how to go through each object and check to see if it's collided with any other object.  When looping through objects to check for collision, where do I call the loop from (demo project or engine)?  And another big thing is the terrain collision.  My models fall through the map (because of gravity).  I noticed you put up a "GetHeightAt" function which is really useful, now how would I use it?

[Nemo Krad]

I am sure I gave an example of Terrain collision with my class, if not then I apologies.

Here is an example of terrain collision, I wrote a demo to show a friend how I was doing animation in my engine, here is the code I used

Code:

namespace DemoAnimation
{
    class DemoAnimation
    {
        static RCGame game = new RCGame();
        static RCModel tiny = new RCModel("Content/Models/tiny", "Tiny");

        public static void Main()
        {
            if (game.ValidateGraphicsCard())
            {
                game.Input.OnUpdate += new UpdateMethod(KeyboardControls);
                game.Input.OnUpdate += new UpdateMethod(CameraControls);
                game.OnEngineDraw += new EngineDrawEvent(Draw);

                SetupScene();
                game.Run();
            }
        }
        private static void SetupScene()
        {
            RCShaderManager.AddShader(new RCShader(@"Content/Shaders/Ocean"), "WAT");
            RCShaderManager.AddShader(new RCShader(@"Content/Shaders/TerrainTextured"), "TTT");
            RCShaderManager.AddShader(new RCShader(@"Content/Shaders/TransformTexture"), "TT");
            RCShaderManager.AddShader(new RCShader(@"Content/Shaders/BoneAnimationTransform"), "ANIM");

            Vector3 LightPosition = new Vector3(0, 10, 5);

            RCSkyBox sb = new RCSkyBox(new string[] { "Content/Textures/SkyBox/HazyMind/top",
                                                      "Content/Textures/SkyBox/HazyMind/bottom",
                                                      "Content/Textures/SkyBox/HazyMind/left",
                                                      "Content/Textures/SkyBox/HazyMind/right",
                                                      "Content/Textures/SkyBox/HazyMind/front",
                                                      "Content/Textures/SkyBox/HazyMind/back" }, "sb");
            sb.SetShader("TT");
            game.Scene.AddObject(sb, "sb");

            string[] textures = new string[] { "Content/Textures/Terrain/sand", "Content/Textures/Terrain/grass", "Content/Textures/Terrain/rock", "Content/Textures/Terrain/snow" };
            RCTerrain terrain = new RCTerrain(textures, "Content/Textures/Terrain/TheValley", "Terrain");
            terrain.SetShader("TTT");
            terrain.LightPosition = LightPosition;
            terrain.Position = new Vector3(0, -30, 0);
            game.Scene.AddObject(terrain, "terrain");

            RCWater water = new RCWater("Content/Textures/SkyBox/HazyMind/cubeMap", "Content/Textures/Terrain/waves2", "water");
            water.SetShader("WAT");
            water.Width = 256;
            water.Height = 256;
            water.WaveFrequency = .2f;
            water.WaveAmplitude = .1f;
            water.DeepWaterColor = Color.Navy.ToVector4();
            water.ShallowWaterColor = Color.DarkSeaGreen.ToVector4();
            water.ReflectionColor = Color.DarkGray.ToVector4();
            water.ReflectionAmount = 0.7f;
            water.Position = new Vector3(0, -26, 0);
            water.AnimationSpeed = .05f;
            game.Scene.AddObject(water, "water");

            tiny.SetShader("ANIM");
            tiny.Scaling = new Vector3(.025f, .025f, .025f);
            tiny.Position = new Vector3(0, 0, -128f);
            tiny.Rotate(new Vector3(0, 1, 0), MathHelper.Pi);
            game.Scene.AddObject(tiny, "Tiny");

            RCHelper.Fog.FogColor = Color.WhiteSmoke;
            RCHelper.Fog.FogEnable = false;
            RCHelper.Fog.FogStart = .95f;
            RCHelper.Fog.FogEnd = .999f;
            RCHelper.Fog.FogTableMode = FogMode.Linear;           
        }
        public static void Draw()
        {
            RCTerrain terrain = (RCTerrain)game.Scene.GetObject("terrain").Object;
            Vector3 offset = new Vector3(tiny.Position.X, tiny.Position.Y + 10.4f, tiny.Position.Z);
            float y = terrain.GetHeightAt(offset).Z;
            if (terrain.Collision(offset, 0))
            {
                game.WriteText(game.Font, 10, 200, "Collision", Color.Red);
                tiny.Position = new Vector3(offset.X, (y - 10.6f), offset.Z);
            }
            if (y < offset.Y + .2f)
            {
                tiny.Position = new Vector3(offset.X, (y - 10.4f) - .1f, offset.Z);
            }
            tiny.Translate(new Vector3(0, 0, -.25f));

            if (tiny.Position.Z > 128)
                tiny.Position = new Vector3(0, 0, -128f);
        }

        public static void KeyboardControls()
        {
            if (game.Input.Keys.Contains(Keys.Escape))
            {
                if (game.Sounds != null)
                    game.Sounds.StopAllMusic();

                if (game.Graphics.IsFullScreen)
                    game.Graphics.ToggleFullScreen();

                game.Exit();
                return;
            }

            if (game.Input.Keys.Contains(Keys.F))
            {
                if (!game.Graphics.IsFullScreen)
                    game.Graphics.ToggleFullScreen();
            }
            if (game.Input.Keys.Contains(Keys.N))
            {
                if (game.Graphics.IsFullScreen)
                    game.Graphics.ToggleFullScreen();
            }

            if (game.Input.Keys.Contains(Keys.Left))
            {
                RCCameraManager.ActiveCamera.Translate(new Vector3(-0.1f, 0, 0));
            }
            if (game.Input.Keys.Contains(Keys.Right))
            {
                RCCameraManager.ActiveCamera.Translate(new Vector3(0.1f, 0, 0));
            }

            if (game.Input.Keys.Contains(Keys.Up))
                RCCameraManager.ActiveCamera.Translate(new Vector3(0, 0, -0.1f));

            if (game.Input.Keys.Contains(Keys.Down))
                RCCameraManager.ActiveCamera.Translate(new Vector3(0, 0, 0.1f));


            if (game.Input.Keys.Contains(Keys.X))
            {
                RCCameraManager.ActiveCamera.RevolveTarget = new Vector3(0, 0, 1);
                RCCameraManager.ActiveCamera.Position = new Vector3(0, 0, 1);
                RCCameraManager.ActiveCamera.Rotation = new Quaternion(0, 0, 0, 1);
            }
        }
        public static void CameraControls()
        {
            Vector2 mouseMove = game.Input.MouseMoved;

            RCCameraManager.ActiveCamera.Rotate(new Vector3(1, 0, 0), mouseMove.Y * 0.01f);
            RCCameraManager.ActiveCamera.Rotate(new Vector3(0, 1, 0), mouseMove.X * 0.01f);
        }
    }
}

The terrain collision for tiny is in the Draw method. For collision detection for model on model take a look at the ray picking code and substitute the ray with the model you want to check for collision against.

[Jonotron]

 Does the terrain collision detecting have to be done in the demo.Draw() Procedure?  I want to make a physicsmanager and call that from the engine.Update() sub.  Could I do it that way?

[EDIT]I've managed to get that into my physicsManager.  I have another problem, when I try to make it so the camera cannot go through the terrain... it goes through the terrain at some points then at other points, it does what I want it to do.  When it DOES go through the terrain at some points, it stops it approximately 5f from the terrain.

Here is the code for camera collision:

Code:

public static void CheckCameraCollision()
        {
            //check terrain collision first
            Terrain terr = (Terrain)ObjectManager.Objects["terrain"];
           
            if (terr != null)
            {
                Vector3 campos = CameraManager.ActiveCamera.Position;
                Vector3 offset = new Vector3(campos.X, campos.Y + 5f, campos.Z);
                float y = terr.GetHeightAt(offset).Z;

                if (terr.Collision(offset, 0))
                {
                    //COLLISION
                    CameraManager.ActiveCamera.Position = new Vector3(offset.X, (y + 5.2f), offset.Z);
                }
                if (y < offset.Y + .2f)
                {
                    CameraManager.ActiveCamera.Position = new Vector3(offset.X, (y + 5f) - .1f, offset.Z);
                }

                if (CameraManager.ActiveCamera.Position.Z > 128)
                    CameraManager.ActiveCamera.Position = new Vector3(0, 0, -128f);

            }
        }

[Nemo Krad]

I had this issue, it turned out that I wax mixing up my X and Y planes when checking for height in the height map. Use the GetHeightAt method to find out what your collision function thinks the terrain height should be where you collide with the terrain.