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POOnly seeing 1 object out of an array of 3 in XNA
 

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  1. POOnly seeing 1 object out of an array of 3 in XNA
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    <p>Can anyone see where I am going wrong here.</p> <p>I have a CameraObject class (its not a camera, simply the Model of a box to represent a "camera") that has a Model and a Position. It also has the usual LoadContent(), Draw() and Update() methods. However, when I draw the array of Models, I only see 1 model on the screen (well, there might be 3 but they might all be in the same location)?</p> <p>The Draw() method for the CameraModel class looks like this:</p> <pre><code>public void Draw(Matrix view, Matrix projection) { transforms = new Matrix[CameraModel.Bones.Count]; CameraModel.CopyAbsoluteBoneTransformsTo(transforms); // Draw the model foreach(ModelMesh myMesh in CameraModel.Meshes) { foreach (BasicEffect myEffect in myMesh.Effects) { myEffect.World = transforms[myMesh.ParentBone.Index]; myEffect.View = view; myEffect.Projection = projection; myEffect.EnableDefaultLighting(); myEffect.SpecularColor = new Vector3(0.25f); myEffect.SpecularPower = 16; } myMesh.Draw(); } } </code></pre> <p>Then in my Game1 class I create an array of CameraObject objects:</p> <pre><code>CameraObject[] cameraObject = new CameraObject[3]; </code></pre> <p>Which I Initialize() - so each new object should be at +10 from the previous object</p> <pre><code>for (int i = 0; i &lt; cameraObject.Length; i++) { cameraObject[i] = new CameraObject(); cameraObject[i].Position = new Vector3(i * 10, i * 10, i * 10); } </code></pre> <p>And finally Draw()</p> <pre><code>Matrix view = camera.viewMatrix; Matrix projection = camera.projectionMatrix; for (int i = 0; i &lt; cameraObject.Length; i++) { cameraObject[i].Draw(view, projection); } </code></pre> <p>Where view and projection are from my Camera() class which looks like so:</p> <pre><code>viewMatrix = Matrix.Identity; projectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(45.0f), 16 / 9, .5f, 500f); </code></pre> <p>But I only see 1 object drawn to the screen? I have stepped through the code and all seems well but I cant figure out why I cant see 3 objects?</p> <p>Can anyone spot where I am going wrong?</p> <p>This is the code in my Camera() class to UpdateViewMatrix:</p> <pre><code>private void UpdateViewMatrix(Matrix chasedObjectsWorld) { switch (currentCameraMode) { case CameraMode.free: // To be able to rotate the camera and and not always have it looking at the same point // Normalize the cameraRotation’s vectors, as those are the vectors that the camera will rotate around cameraRotation.Forward.Normalize(); cameraRotation.Up.Normalize(); cameraRotation.Right.Normalize(); // Multiply the cameraRotation by the Matrix.CreateFromAxisAngle() function, // which rotates the matrix around any vector by a certain angle // Rotate the matrix around its own vectors so that it works properly no matter how it’s rotated already cameraRotation *= Matrix.CreateFromAxisAngle(cameraRotation.Right, pitch); cameraRotation *= Matrix.CreateFromAxisAngle(cameraRotation.Up, yaw); cameraRotation *= Matrix.CreateFromAxisAngle(cameraRotation.Forward, roll); // After the matrix is rotated, the yaw, pitch, and roll values are set back to zero yaw = 0.0f; pitch = 0.0f; roll = 0.0f; // The target is changed to accommodate the rotation matrix // It is set at the camera’s position, and then cameraRotation’s forward vector is added to it // This ensures that the camera is always looking in the direction of the forward vector, no matter how it’s rotated target = Position + cameraRotation.Forward; break; case CameraMode.chase: // Normalize the rotation matrix’s forward vector because we’ll be using that vector to roll around cameraRotation.Forward.Normalize(); chasedObjectsWorld.Right.Normalize(); chasedObjectsWorld.Up.Normalize(); cameraRotation = Matrix.CreateFromAxisAngle(cameraRotation.Forward, roll); // Each frame, desiredTarget will be set to the position of whatever object we’re chasing // Then set the actual target equal to the desiredTarget, can then change the target’s X and Y coordinates at will desiredTarget = chasedObjectsWorld.Translation; target = desiredTarget; target += chasedObjectsWorld.Right * yaw; target += chasedObjectsWorld.Up * pitch; // Always want the camera positioned behind the object, // desiredPosition needs to be transformed by the chased object’s world matrix desiredPosition = Vector3.Transform(offsetDistance, chasedObjectsWorld); // Smooth the camera’s movement and transition the target vector back to the desired target Position = Vector3.SmoothStep(Position, desiredPosition, .15f); yaw = MathHelper.SmoothStep(yaw, 0f, .1f); pitch = MathHelper.SmoothStep(pitch, 0f, .1f); roll = MathHelper.SmoothStep(roll, 0f, .1f); break; case CameraMode.orbit: // Normalizing the rotation matrix’s forward vector, and then cameraRotation is calculated cameraRotation.Forward.Normalize(); // Instead of yawing and pitching over cameraRotation’s vectors, we yaw and pitch over the world axes // By rotating over world axes instead of local axes, the orbiting effect is achieved cameraRotation = Matrix.CreateRotationX(pitch) * Matrix.CreateRotationY(yaw) * Matrix.CreateFromAxisAngle(cameraRotation.Forward, roll); desiredPosition = Vector3.Transform(offsetDistance, cameraRotation); desiredPosition += chasedObjectsWorld.Translation; Position = desiredPosition; target = chasedObjectsWorld.Translation; roll = MathHelper.SmoothStep(roll, 0f, .2f); break; } // Use this line of code to set up the View Matrix // Calculate the view matrix // The up vector is based on how the camera is rotated and not off the standard Vector3.Up // The view matrix needs an up vector to fully orient itself in 3D space, otherwise, // the camera would have no way of knowing whether or not it’s upside-down viewMatrix = Matrix.CreateLookAt(Position, target, cameraRotation.Up); } </code></pre>
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    1. COWhat is the position of the camera? Try varying only the x-position of the created objects and moving your camera back.
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    2. COOk Ill try that. The camera is at: Position = new Vector3(0, 10, 70);
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    3. CONope, still only 1 object
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      1. USheyred
 

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