private void DrawBoundingPrimitive(GameTime gameTime, ICollisionPrimitive collisionPrimitive, Color color)
{
if (collisionPrimitive is SphereCollisionPrimitive)
{
int primitiveCount = 0;
vertexData = new VertexData <VertexPositionColor>(VertexFactory.GetSphereVertices(1, 10, out primitiveCount),
PrimitiveType.LineStrip, primitiveCount);
coll = collisionPrimitive as SphereCollisionPrimitive;
world = Matrix.Identity * Matrix.CreateScale(coll.BoundingSphere.Radius) * Matrix.CreateTranslation(coll.BoundingSphere.Center);
wireframeEffect.World = world;
wireframeEffect.View = cameraManager.ActiveCamera.View;
wireframeEffect.Projection = cameraManager.ActiveCamera.Projection;
wireframeEffect.DiffuseColor = Color.White.ToVector3();
wireframeEffect.CurrentTechnique.Passes[0].Apply();
vertexData.Draw(gameTime, wireframeEffect);
}
else
{
BoxCollisionPrimitive coll = collisionPrimitive as BoxCollisionPrimitive;
BoundingBoxBuffers buffers = BoundingBoxDrawer.CreateBoundingBoxBuffers(coll.BoundingBox, GraphicsDevice);
BoundingBoxDrawer.DrawBoundingBox(buffers, wireframeEffect, GraphicsDevice,
cameraManager.ActiveCamera);
}
}
public static void DrawBoundingBox(BoundingBoxBuffers buffers, BasicEffect effect,
GraphicsDevice graphicsDevice, Camera3D camera)
{
graphicsDevice.SetVertexBuffer(buffers.Vertices);
graphicsDevice.Indices = buffers.Indices;
effect.World = Matrix.Identity;
effect.View = camera.View;
effect.Projection = camera.Projection;
foreach (EffectPass pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
graphicsDevice.DrawIndexedPrimitives(PrimitiveType.LineList, 0, 0,
buffers.PrimitiveCount);
}
}
public static 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);
}