protected override void LoadContent()
{
Model model = Game.Content.Load<Model>(_modelAssetName);
BoundingBox boundingBox = CreateBoundingBox(model, _translateMatrix);
_buffers = CreateBoundingBoxBuffers(boundingBox, GraphicsDevice);
_effect = new BasicEffect(GraphicsDevice);
_effect.LightingEnabled = false;
_effect.TextureEnabled = false;
_effect.VertexColorEnabled = true;
base.LoadContent();
}
private BoundingBoxBuffers CreateBoundingBoxBuffers(BoundingBox boundingBox, GraphicsDevice graphicsDevice)
{
BoundingBoxBuffers boundingBoxBuffers = new BoundingBoxBuffers();
boundingBoxBuffers.PrimitiveCount = 24;
boundingBoxBuffers.VertexCount = 48;
VertexBuffer vertexBuffer = new VertexBuffer(graphicsDevice,
typeof(VertexPositionColor), boundingBoxBuffers.VertexCount,
BufferUsage.WriteOnly);
List<VertexPositionColor> vertices = new List<VertexPositionColor>();
const float ratio = 5.0f;
Vector3 xOffset = new Vector3((boundingBox.Max.X - boundingBox.Min.X) / ratio, 0, 0);
Vector3 yOffset = new Vector3(0, (boundingBox.Max.Y - boundingBox.Min.Y) / ratio, 0);
Vector3 zOffset = new Vector3(0, 0, (boundingBox.Max.Z - boundingBox.Min.Z) / ratio);
Vector3[] corners = boundingBox.GetCorners();
// Corner 1.
AddVertex(vertices, corners[0]);
AddVertex(vertices, corners[0] + xOffset);
AddVertex(vertices, corners[0]);
AddVertex(vertices, corners[0] - yOffset);
AddVertex(vertices, corners[0]);
AddVertex(vertices, corners[0] - zOffset);
// Corner 2.
AddVertex(vertices, corners[1]);
AddVertex(vertices, corners[1] - xOffset);
AddVertex(vertices, corners[1]);
AddVertex(vertices, corners[1] - yOffset);
AddVertex(vertices, corners[1]);
AddVertex(vertices, corners[1] - zOffset);
// Corner 3.
AddVertex(vertices, corners[2]);
AddVertex(vertices, corners[2] - xOffset);
AddVertex(vertices, corners[2]);
AddVertex(vertices, corners[2] + yOffset);
AddVertex(vertices, corners[2]);
AddVertex(vertices, corners[2] - zOffset);
// Corner 4.
AddVertex(vertices, corners[3]);
AddVertex(vertices, corners[3] + xOffset);
AddVertex(vertices, corners[3]);
AddVertex(vertices, corners[3] + yOffset);
AddVertex(vertices, corners[3]);
AddVertex(vertices, corners[3] - zOffset);
// Corner 5.
AddVertex(vertices, corners[4]);
AddVertex(vertices, corners[4] + xOffset);
AddVertex(vertices, corners[4]);
AddVertex(vertices, corners[4] - yOffset);
AddVertex(vertices, corners[4]);
AddVertex(vertices, corners[4] + zOffset);
// Corner 6.
AddVertex(vertices, corners[5]);
AddVertex(vertices, corners[5] - xOffset);
AddVertex(vertices, corners[5]);
AddVertex(vertices, corners[5] - yOffset);
AddVertex(vertices, corners[5]);
AddVertex(vertices, corners[5] + zOffset);
// Corner 7.
AddVertex(vertices, corners[6]);
AddVertex(vertices, corners[6] - xOffset);
AddVertex(vertices, corners[6]);
AddVertex(vertices, corners[6] + yOffset);
AddVertex(vertices, corners[6]);
AddVertex(vertices, corners[6] + zOffset);
// Corner 8.
AddVertex(vertices, corners[7]);
AddVertex(vertices, corners[7] + xOffset);
AddVertex(vertices, corners[7]);
AddVertex(vertices, corners[7] + yOffset);
AddVertex(vertices, corners[7]);
AddVertex(vertices, corners[7] + zOffset);
vertexBuffer.SetData(vertices.ToArray());
boundingBoxBuffers.Vertices = vertexBuffer;
IndexBuffer indexBuffer = new IndexBuffer(graphicsDevice, IndexElementSize.SixteenBits, boundingBoxBuffers.VertexCount,
BufferUsage.WriteOnly);
indexBuffer.SetData(Enumerable.Range(0, boundingBoxBuffers.VertexCount).Select(i => (short)i).ToArray());
boundingBoxBuffers.Indices = indexBuffer;
return boundingBoxBuffers;
}