/// <summary>
/// Calculates if the area is visible within a camera viewport or not
/// </summary>
/// <param name="area">The area</param>
/// <param name="camera">The camera to check against</param>
/// <returns>True if the area is visible, false if not</returns>
public bool IsAreaVisible(Area area, CameraBase camera)
{
if (area.Info.IsEmpty)
{
return false;
}
// Calculate the distance from the area to the camera
areaToCameraDistance = (area.Info.Center - camera.Position).Length();
// Is the area within stand-on or next-to distance
if (areaToCameraDistance < areasAlwaysVisibleWithinDistance)
{
return true;
}
// Calculate the normal from the area pointing towards the camera position
areaLookAtNormal = (camera.Position - area.Info.Center);
areaLookAtNormal.Normalize();
return Vector3.Dot(camera.LookAtNormal, areaLookAtNormal) <= -0.5f;
}
public void UpdateCamera(CameraBase camera)
{
camera.Position = spatialComponent.RigidBody.Position;
camera.Position.Y += playerComponent.CameraOffsetY;
Matrix cameraRotation = Matrix.CreateRotationX(radian * -spatialComponent.Angle.Y) *
Matrix.CreateRotationY(radian * -spatialComponent.Angle.X) *
Matrix.CreateRotationZ(radian * -spatialComponent.Angle.Z);
Vector3 upVector = Vector3.Transform(Vector3.Up, cameraRotation);
camera.Target = camera.Position - Vector3.Transform(Vector3.Forward, cameraRotation);
camera.View = Matrix.CreateLookAt(camera.Position, camera.Target, upVector);
}
public void UpdateCamera3rdPerson(CameraBase camera)
{
camera.Position = spatialComponent.RigidBody.Position;
camera.Position.Y += playerComponent.CameraOffsetY;
Vector3 thirdPersonReference = new Vector3(0, 0.4f, 4f);
Matrix rotationMatrix = Matrix.CreateRotationY(radian * (-spatialComponent.Angle.X + 180));
// Create a vector pointing the direction the camera is facing.
Vector3 transformedReference = Vector3.Transform(thirdPersonReference, rotationMatrix);
// Calculate the position the camera is looking from.
Vector3 cameraPosition = transformedReference + spatialComponent.Position;
camera.View = Matrix.CreateLookAt(cameraPosition, spatialComponent.Position, Vector3.Up);
}
public void Render(GameTime gameTime, CameraBase camera)
{
// Clear old content
VisibleTerrainMeshes.Clear();
// Loop through all areas to see which ones should be rendered
for (int i = 0; i < terrainVisibility.AreaCollection.Areas.Count; i++)
{
area = terrainVisibility.AreaCollection.Areas[i];
// Skip areas not visible to the camera
if (!terrainVisibility.IsAreaVisible(area, camera))
{
continue;
}
// Loop through all meshes within the current area and add them to the visible groups
foreach (KeyValuePair<TileType, TerrainMesh> meshPair in area.Model.Meshes)
{
// Initialize the current mesh-group key if needed
if (!VisibleTerrainMeshes.ContainsKey(meshPair.Key))
{
VisibleTerrainMeshes.Add(meshPair.Key, new List<TerrainMesh>());
}
meshPair.Value.Offset.X = area.Info.Location.X * Area.Size.X;
meshPair.Value.Offset.Y = (area.Info.Location.Y * Area.Size.Y);
meshPair.Value.Offset.Z = area.Info.Location.Z * Area.Size.Z;
// Add the mesh to the visible groups
VisibleTerrainMeshes[meshPair.Key].Add(meshPair.Value);
}
}
// Initiate rendering
var device = context.Graphics.Device;
var effect = context.Graphics.Effect as BasicEffect;
RenderStateContext.SetRenderStates(device);
// Loop through all visible meshes
foreach (var meshCollection in VisibleTerrainMeshes)
{
// Set the current texture
effect.Texture = context.Resources.Textures["Tile" + ((ushort)meshCollection.Key).ToString()];
// Loop through all meshes using the current texture
for (int i = 0; i < meshCollection.Value.Count; i++)
{
mesh = meshCollection.Value[i];
// Skip empty meshes
if (mesh.VertexCount == 0 || mesh.VertexBuffer == null)
{
continue;
}
// Set the vertex and index data to be rendered
device.SetVertexBuffer(mesh.VertexBuffer);
device.Indices = mesh.IndexBuffer;
// Translate the mesh
effect.World = Matrix.CreateTranslation(mesh.Offset);
// Loop through all effect passes
for (int j = 0; j < context.Graphics.Effect.CurrentTechnique.Passes.Count; j++)
{
// Apply the current effect pass
context.Graphics.Effect.CurrentTechnique.Passes[j].Apply();
// Render the mesh
device.DrawIndexedPrimitives(PrimitiveType.TriangleList,
0,
0,
mesh.VertexCount,
0,
mesh.IndexCount / 3);
}
}
}
}
