Today's meeting was the first meeting with Luke in this semester. I
demonstrated what I have done during summer vacation to Luke. We already have
a 3D rendering engine that can render 3D strings and those API's have been
provided for writing further user interface. They all seemed very happy with
what I have done for the project. Basic functionalities and operations of the
knot rendering engine are described as bellow ---

Add A New End Control Point Uing A key: while holding on A key, left click on
the screen; It adds a new control point at the end of the string. When there
are more than three control points, the program starts rendering the string.
Show Editing Ball Using S key: Press S key to toggle on or off showing the
editing balls on all control points.

Delete A Control Point Using D key: When the control balls are visible, a left
click on a control ball will select this ball. The ball will become red and
the X, Y, Z coordinators will appear on the ball. At this moment, press D key,
this selected contorl point will be deleted.

Add A New Internal Control Point Uing E key: To add a new control point
between two existing control points on the string. Left click to select one
control ball, holding on E key, continue to select next control ball using a
left click. Two selected balls will become red. Then release the E key, press
the E key again, a new control point will be added and a new control ball will
be drawn at the position.

Move A Control Point Using Left Click, Drag & Drop: When a control ball is
selected, the coordinators are shown, a left click on the X, Y or Z axis will
select that axis and the axis will become white. At this moment, a drag & drop
on different directions will move the control point to a new position.
Make A String To Be A Closed String Using G key: Press G key, it joins the
start point with the end point making a string to be a closed one. Press G key
again, it makes it back to be open one.

A Undo Using [ key: Press [ key to make a undo, being one step back in the
editing history. The editing history is unlimited recording all editing steps.

A Redo Using ] key: Press ] key to make a redo.

Toggle Wireframe Mode Using F key: Press F key to toggle on or off the
wireframe display mode.

Reduce The Radius Of The Strings Using - key: Press - key to reduce the radius
of the strings. It has a minimal radius restriction.

Enlarge The Radius Of The Strings Using = key: Press = key to enlarge the
radius of the strings. It has a maximal radius restriction.

Switch Between Two Strings Of A Knot Using R key: Press R key to activate
another string of the knot. It switch to working on this active string and the
previous one becomes inactive.

Put A Tree Frustum Into The Scene Using T key: Press T key to put into or take
out from the scene a tree frustum.

Put A Hanger Into The Scene Using Y key: Press Y key to put into or take out
from the scene a string hanger.

Rotate The Scene Using X Key And Drag & Drop: While pressing the X key, a drag
& drop in different direction will rotate and scene.

Pan Camera Using Arrow Keys: Holding on left, right, up and down arrow keys
will move the scence in four relative directions.

Zoom In or Zoom Out Using Mouse Wheel Or Page Up & Page Down Keys: Scrooling
the mouse wheel or holding on Page Up or Page Down key will do zoom in or zoom
out camera operations.

Switch To Four View Windows Using 4 Key: Press 4 key at any time, it will
switch to four view windows with Top, Right, Front and Perspective views.
Activate A View Window Using Left Click: When it's four views, a left click on
any view window will activate this view to be current active working one.
Swith To One View Window Using 1 Key: When it's four views, press 1 key, it
will enlarge the active view window.

Play Knot Animation Using P key: Press P key, the knot engine kernel will play
two kinds of animations showing how the strings of the knot are tied step by
step.