/// <summary>
/// Traverses the specified graph path</summary>
/// <param name="graphPath">The graph path</param>
/// <param name="action">The render action</param>
/// <param name="camera">The camera</param>
/// <param name="list">The list</param>
/// <returns></returns>
public override TraverseState Traverse(Stack<SceneNode> graphPath, IRenderAction action, Camera camera, ICollection<TraverseNode> list)
{
// Get the "top matrix" before we push a new matrix on to it, just in case we need
// it for the bounding box test.
Matrix4F parentToWorld = action.TopMatrix;
// Push matrix onto the matrix stack even if we're not visible because this class
// implements the marker interface ISetsLocalTransform.
action.PushMatrix(m_node.Transform, true);
// If node is invisible then cull
if (!m_node.Visible)
return TraverseState.Cull;
TraverseState dResult = action.TraverseState;
if (dResult == TraverseState.None)
{
// Test if bounding sphere is contained in frustum
if (s_enableVFCull)
{
// Construct bounding box
Box box = new Box();
box.Extend(m_node.BoundingBox);
// Transform the bounding box into view space
Matrix4F localToView = Matrix4F.Multiply(parentToWorld, camera.ViewMatrix);
box.Transform(localToView);
if (!camera.Frustum.Contains(box))
dResult = TraverseState.Cull;
}
}
return dResult;
}
/// <summary>
/// Sets this camera to have the same state as the given camera</summary>
/// <param name="source">Source camera, which is not modified. This camera becomes a copy of it.</param>
public void Init(Camera source)
{
ViewTypes perspective;
Vec3F eye;
Vec3F lookAtPoint;
Vec3F upVector;
float yFov;
float nearZ;
float farZ;
float focusRadius;
source.GetState(
out perspective,
out eye,
out lookAtPoint,
out upVector,
out yFov,
out nearZ,
out farZ,
out focusRadius);
SetState(
perspective,
eye,
lookAtPoint,
upVector,
yFov,
nearZ,
farZ,
focusRadius);
}
/// <summary>
/// Traverses the specified graph path.</summary>
/// <param name="graphPath">The graph path</param>
/// <param name="action">The render action</param>
/// <param name="camera">The camera</param>
/// <param name="list">The list</param>
/// <returns></returns>
public override TraverseState Traverse(Stack<SceneNode> graphPath, IRenderAction action,
Camera camera, ICollection<TraverseNode> list)
{
// If invisible then cull
if (!m_primitives.Visible)
return TraverseState.Cull;
return base.Traverse(graphPath, action, camera, list);
}
/// <summary>
/// Calculates required scale such that when it applied to an
/// object. The object maintain a constant size in pixel regardless of
/// its distance from camera.
/// Used for computing size of 3d manipulators.</summary>
/// <param name="camera"></param>
/// <param name="objectPosW"></param>
/// <param name="sizeInPixels"></param>
/// <param name="viewHeight"></param>
public static float CalcAxisScale(Camera camera,
Vec3F objectPosW,
float sizeInPixels,
float viewHeight)
{
float worldHeight;
// World height on origin's z value
if (camera.Frustum.IsOrtho)
{
worldHeight = (camera.Frustum.Top - camera.Frustum.Bottom);
}
else
{
Matrix4F view = camera.ViewMatrix;
Vec3F objPosV;
view.Transform(objectPosW, out objPosV);
worldHeight = 2.0f * Math.Abs(objPosV.Z) * (float)Math.Tan(camera.Frustum.FovY / 2.0f);
}
return sizeInPixels * (worldHeight / viewHeight);
}
public static void ZoomOnSphere(Camera cam, Sphere3F sphere)
{
float nearZ = cam.PerspectiveNearZ;
// todo refactor cam.ZoomOnSphere()
cam.ZoomOnSphere(sphere);
cam.PerspectiveNearZ = nearZ;
}
/// <summary>
/// Synchronizes the camera to the controller's current state</summary>
/// <param name="camera">Camera</param>
protected override void ControllerToCamera(Camera camera)
{
Vec3F lookAt = camera.LookAt;
Vec3F right = camera.Right;
Vec3F up = camera.Up;
if (camera.ViewType == ViewTypes.Perspective)
{
Camera.PerspectiveNearZ = CalculatePerspectiveNearZ();
// override the camera's frame of reference
float sinPhi = (float)Math.Sin(m_elevation);
float cosPhi = (float)Math.Cos(m_elevation);
float sinTheta = (float)Math.Sin(m_azimuth);
float cosTheta = (float)Math.Cos(m_azimuth);
lookAt = new Vec3F(-cosPhi * sinTheta, -sinPhi, -cosPhi * cosTheta);
right = new Vec3F(cosTheta, 0, -sinTheta);
up = Vec3F.Cross(right, lookAt); // TODO compute from sin/cos values
}
float lookAtOffset = 0;
if (m_distanceFromLookAt < m_dollyThreshold) // do we need to start dollying?
lookAtOffset = m_distanceFromLookAt - m_dollyThreshold;
float eyeOffset = m_distanceFromLookAt;
Camera.Set(
m_lookAtPoint - (eyeOffset * lookAt), // eye point
m_lookAtPoint - (lookAtOffset * lookAt), // look-at point
up); // up vector
base.ControllerToCamera(camera);
}
/// <summary>
/// Synchronizes the controller to the camera's current state</summary>
/// <param name="camera">Camera</param>
protected override void CameraToController(Camera camera)
{
m_lookAtPoint = Camera.LookAtPoint;
m_distanceFromLookAt = Camera.DistanceFromLookAt;
m_dollyThreshold = Camera.FocusRadius * 0.1f;
Vec3F lookAtDir = Camera.LookAt;
Vec3F up = Camera.Up;
m_elevation = (float)Math.Asin(-lookAtDir.Y);
if (up.Y < 0)
{
if (lookAtDir.Y > 0)
m_elevation = -PI - m_elevation;
else
m_elevation = PI - m_elevation;
m_azimuth = (float)Math.Atan2(lookAtDir.X, lookAtDir.Z);
}
else
{
m_azimuth = (float)Math.Atan2(-lookAtDir.X, -lookAtDir.Z);
}
base.CameraToController(camera);
}
/// <summary>
/// Gets whether this camera can handle the given camera</summary>
/// <param name="camera">Camera</param>
/// <returns>True iff this camera can handle the given camera</returns>
public virtual bool CanHandleCamera(Camera camera)
{
return true;
}
/// <summary>
/// Gets a value indicating if this camera can handle the given camera</summary>
/// <param name="camera">Camera</param>
/// <returns>value indicating if this camera can handle the given camera</returns>
public override bool CanHandleCamera(Camera camera)
{
return camera.ProjectionType != ProjectionType.Orthographic;
}
/// <summary>
/// Projects the specified x and y, in normalized window coordinates, onto the grid,
/// and snaps it to the nearest grid vertex if necessary.
/// Normalized window coordinates are in the range [-0.5,0.5] with +x pointing to the
/// right and +y pointing up.</summary>
/// <param name="x">Window x in normalized window coords</param>
/// <param name="y">Window y in normalized window coords</param>
/// <param name="camera">Camera</param>
/// <returns>Projection of x and y onto the grid, in world space.</returns>
public Vec3F Project(float x, float y, Camera camera)
{
Ray3F ray = camera.CreateRay(x, y);
Matrix4F V = new Matrix4F(camera.ViewMatrix);
V.Mul(m_invAxisSystem, V);
if (camera.Frustum.IsOrtho)
{
V = new Matrix4F(m_V);
V.Translation = camera.ViewMatrix.Translation;
}
// origin
Vec3F delta = new Vec3F(0, Height, 0);
V.Transform(delta, out delta);
Vec3F o = delta;
// Up vec
Vec3F axis = V.YAxis;
Vec3F projPt = ray.IntersectPlane(axis, -Vec3F.Dot(o, axis));
// Transform back into world space
Matrix4F Inv = new Matrix4F();
Inv.Invert(camera.ViewMatrix);
Inv.Transform(projPt, out projPt);
if (Snap)
{
projPt = SnapPoint(projPt);
}
return projPt;
}
/// <summary>
/// Called after post visiting the SceneNode specified by the graph path</summary>
/// <param name="graphPath">The graph path</param>
/// <param name="action">The render action</param>
/// <param name="camera">The camera</param>
/// <param name="list">The traverse list</param>
/// <returns></returns>
public override TraverseState PostTraverse(Stack<SceneNode> graphPath, IRenderAction action, Camera camera, ICollection<TraverseNode> list)
{
action.PopMatrix();
return TraverseState.Continue;
}
/// <summary>
/// Synchronizes the controller to the camera's current state</summary>
/// <param name="camera">Camera</param>
/// <remarks>Both CameraToController and ControllerToCamera should be
/// overridden for controllers that shadow camera state</remarks>
protected virtual void CameraToController(Camera camera)
{
}
/// <summary>
/// Performs any camera initialization required by the controller</summary>
/// <param name="camera">Camera</param>
protected virtual void Setup(Camera camera)
{
}
/// <summary>
/// Synchronizes the controller to the camera's current state</summary>
/// <param name="camera">Camera</param>
protected override void CameraToController(Camera camera)
{
m_lookAtPoint = Camera.LookAtPoint;
Vec3F lookAtVector = Camera.Eye - m_lookAtPoint;
m_distanceFromLookAt = lookAtVector.Length;
m_dollyThreshold = Camera.FocusRadius * 0.1f;
m_rotation.Set(Camera.ViewMatrix);
base.CameraToController(camera);
}
/// <summary>
/// Renders the specified graph path</summary>
/// <param name="graphPath">The graph path</param>
/// <param name="renderState">The render state</param>
/// <param name="action">The render action</param>
/// <param name="camera">The camera</param>
protected override void Render(SceneNode[] graphPath, RenderState renderState, IRenderAction action, Camera camera)
{
// apply xform
Gl.glPushMatrix();
Util3D.glMultMatrixf(action.TopMatrix);
if (m_displayListId == 0)
{
RenderStats globalStats = Util3D.RenderStats;
RenderStats ourStats = new RenderStats();
Util3D.RenderStats = ourStats;
m_displayListId = Gl.glGenLists(1);
#if MEMORY_DEBUG
lock(s_lock) NumDisplayListIds++;
#endif
Gl.glNewList(m_displayListId, Gl.GL_COMPILE);
Render(action);
Gl.glEndList();
m_numPrimitives = ourStats.PrimCount;
m_numVertices = ourStats.VertexCount;
Util3D.RenderStats = globalStats;
}
Gl.glCallList(m_displayListId);
Gl.glPopMatrix();
Util3D.RenderStats.PrimCount += m_numPrimitives;
Util3D.RenderStats.VertexCount += m_numVertices;
}
/// <summary>
/// Synchronizes the camera to the controller's current state</summary>
/// <param name="camera">Camera</param>
protected override void ControllerToCamera(Camera camera)
{
Vec3F lookAt = Camera.LookAt;
Vec3F up = Camera.Up;
if (camera.ViewType == ViewTypes.Perspective)
{
QuatF rotation = m_rotation * m_currentRotation;
rotation = rotation.Inverse;
Matrix4F transform = new Matrix4F(rotation);
lookAt = new Vec3F(0, 0, -1);
up = new Vec3F(0, 1, 0);
transform.Transform(ref lookAt);
transform.Transform(ref up);
}
float eyeOffset = m_distanceFromLookAt;
float lookAtOffset = 0;
if (m_distanceFromLookAt < m_dollyThreshold) // do we need to start dollying?
{
eyeOffset = m_distanceFromLookAt;
lookAtOffset = m_distanceFromLookAt - m_dollyThreshold;
}
Camera.Set(
m_lookAtPoint - (eyeOffset * lookAt), // eye
m_lookAtPoint - (lookAtOffset * lookAt), // lookAt
up); // up
base.ControllerToCamera(camera);
}
/// <summary>
/// Custom pick rendering</summary>
/// <param name="graphPath">The graph path</param>
/// <param name="renderState">The render state</param>
/// <param name="action">The render action</param>
/// <param name="camera">The camera</param>
public void PickDispatch(SceneNode[] graphPath, RenderState renderState, IRenderAction action, Camera camera)
{
action.RenderStateGuardian.Commit(renderState);
// apply xform
Gl.glPushMatrix();
Util3D.glMultMatrixf(action.TopMatrix);
RenderVertices(action);
Gl.glPopMatrix();
}
/// <summary>
/// Performs any camera initialization required by the controller</summary>
/// <param name="camera">Camera</param>
protected override void Setup(Camera camera)
{
camera.PerspectiveNearZ = 0.01f;
}
/// <summary>
/// Synchronizes the camera to the controller's current state</summary>
/// <param name="camera">Camera</param>
/// <remarks>Both CameraToController and ControllerToCamera should be
/// overridden for controllers that shadow camera state</remarks>
protected virtual void ControllerToCamera(Camera camera)
{
}
