Lập trình đồ họa trong C (phần 11) potx
Lập trình đồ họa trong C (phần 11) potx
...
objects and texture patterns.
Reducing Object-Intersection Calculations
Raysurface intersection calculations can account for as much as
95
percent of the
processing time in a ray tracer. ... vectors in the viewing and specular-reflection direc-
tions,
we
can calculate the value of cos4 with the dot product
V
R.
Assuming
the specular-reflection coefficient is a constant, we can .....
Lập trình đồ họa trong C (phần 2) potx
... by scan con-
verting the basic geometric-structure specifications into pixel patterns. Typically,
graphics programming packages provide functions to describe a scene in terms
of these basic ... other conic sections, quadric surfaces,
spline curves and surfaces, polygon color areas, and character strings. We begin
our discussion of picture-generation procedures by examining device-level ....
Lập trình đồ họa trong C (phần 6) potx
...
Identifying
a
concave polygon by calculating cross
products of successive pairsof edge vectors.
some cross products
is
positive while others have
a
negative
z
component, we
have a concave polygon. ...
Area Clipping (polygons)
Curve Clipping
Text Clipp~ng
Line and polygon clipping routines
are
standard components of graphics pack-
ages, but many packages accommodate curved o...
Lập trình đồ họa trong C (phần 12) potx
...
physicdly
bnscd
by specifying the forCec acting on
the objects to be animated.
For complex scenes, we can separate the frames into individual components
or objects called
cels
celluloid ... we can expect
to obtain a set of well-matched colors. Rahdomly selected hues can be expected
to produce harsh and clashing color combinations. Another consideration
in
the
selection of color...
Lập trình đồ họa trong C (phần 3) doc
... general curve contour, then fitting.the selected points
with a polynomial. One way to accomplish the curve fitting is to construct a
cubic polynomial curve section between each pair of specified ... tint n, wcPt2 pts)
Draw a connected sequence of
n-1
line segments, specified in
pts .
pCircle (wcPt2 center, float r)
Draw a circle of radius
r
at
center.
ppillarea (int n, wcPt2
pts)...
Lập trình đồ họa trong C (phần 4) pps
... With the
direct
storage scheme, when-
ever a particular color code is specified in an application program, the corre-
sponding binary value is placed in the frame buffer for each-component pixel ... fill color with the two back-
ground colors to obtain the new pixel color. With three background colors and
one foreground color, or with two background and two foreground colors, we
nccd a...
Lập trình đồ họa trong C (phần 5) docx
... lines arc then processed through the intersection calculations,
which must solve simultaneous circle-line equations
Splitting
Concave
Polygons
We can identify a concave polygon by calculating ...
Identifying
a
concave polygon by calculating cross
products of successive pairsof edge vectors.
some cross products
is
positive while others have
a
negative
z
component, we
have a co...
Lập trình đồ họa trong C (phần 7) pdf
... noecho)
;
I
/*
set buttons to choice device. event mode
*/
1
setChoiceMode
(1,
6.
event, noechol
;
do
(
awaitEvent
(60,
vs, deviceclass, devicecode):
if (deviceclass
==
choice) ... electronic circuit schematics, are commonly put together using com-
puter-aided design methods. Graphical methods are used also for representing
economic, financial, organizational, scientific,...
Lập trình đồ họa trong C (phần 8) ppt
... objects
according to the lighting conditions in the scene and according to assigned sur-
face characteristics.
Lighhng
speclhcations include the intensity and positions of
light sources ... Some atmospheric effects can change the perceived color of an object, and
we can model these effects with depth cueing.
Visible Line and Surface Identification
We can also clarify depth
... three...
Lập trình đồ họa trong C (phần 9) pot
... described in the following section, searches the
octants and suboctants of
a
unit cube to locate the regions occupied by the two
objects that are to
be
combined.
10-16
OCTREES
Hierarchical ... quadtree nodes accordingly.
If
each quadrant in the original space has a
Invemd
Circle
L
.
Original
Circb
Figum
10-104
Inversion of a
circle
with
respect to
another circle.
tran...