Tinker Toys Object Control Win Matrix Win View Control Win
The Vertex Window is used to
examine a single vertex. The vertex's locations in the
world-coordinate system, viewing-reference coordinate system and
View Window Panel are displayed along with the equations that were
used to calculate them. The Vertex Window is best used in conjunction
with the Matrix Window, which will
display the composite transform matrices referenced in the equations.
The first line of text shows the name of the vertex that is being
examined. The vertex may be changed by clicking on a different vertex of the
model in the World or
View Window Panels.
The vertex's location in each of the following coordinate systems is
- The world-coordinate (WC)
system: The current WC location of the vertex is generated
by applying the model last transform matrix to the vertex's
previous WC location, if any.
- The viewing-reference
coordinate (VRC) system: The vertex's VRC location
is determined by applying the
matrix to its WC position. The contents of the
view-orientation matrix will be displayed in the
Matrix Window when the mouse is clicked in the background of the
View Window Panel.
- The two-dimensional
view window coordinate
system: If the current projection is parallel, the vertex's position in
view window coordinates is set to the U and V components of the
vector that is created by applying the
to the vertex's VRC position. The shear-parallel matrix will be
displayed along with the view-orientation matrix in the
Matrix Window if the projection is parallel.
If the current projection is perspective, the view window
coordinate position of each vertex is related to its (u, v, n)
distance from the PRP and must be calculated individually.
Calculations for both the U and V components are shown.
If the vertex has been clipped and thus is not displayed in the
View Window Panel, a message to this effect will be displayed
in the Vertex Window.
- Exit: Remove the Vertex Window from the
screen. It may be redisplayed if it has been removed, but
only one instance may exist at any given time.
Last Modified: 5/17/96 APR