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1995-03-18
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QRT Sample Programs
Introduction
The following are actual QRT input files. They can be used as a
guide to suggested QRT indenting style, or as a quick reference
to QRT commands. The first one uses most of the advanced
features of QRT, and would be a good example of QRT programming.
File One
{ ******************************************
QRT source for 8 spheres connected by
reflecting cylenders. The spheres
form the corners of a cube.
****************************************** }
FILE_NAME = object.raw
{ ** Instance definitions for quadratics to save
typing. These quadratics are the cylenders
that connect the spheres ** }
BEGIN_INSTANCES
QUADRATIC ( loc = (0, 0, 0),
name = X_AXIS_QUAD
a = 0,
b = 1,
c = 1,
d = 120,
xmin = 0, xmax = 100,
ymin = -11, ymax = 11,
zmin = -11, zmax = 11,
QRT Ray Tracer Page 1 QRT Sample Programs
diff = ( 0, 0 , 0),
mirror = (.9, .9, .9),
dither = 0
)
QUADRATIC ( loc = (0, 0, 0),
name = Y_AXIS_QUAD
a = 1,
b = 0,
c = 1,
d = 120,
xmin = -11, xmax = 11,
ymin = 0, ymax = 100,
zmin = -11, zmax = 11,
diff = ( 0, 0 , 0),
mirror = (.9, .9, .9),
dither = 0
)
QUADRATIC ( loc = (0, 0, 0),
name = Z_AXIS_QUAD
a = 1,
b = 1,
c = 0,
d = 120,
xmin = -11, xmax = 11,
ymin = -11, ymax = 11,
zmin = 0, zmax = 100,
diff = ( 0, 0 , 0),
mirror = (.9, .9, .9),
dither = 0
)
END_INSTANCES
{ ** A pattern for the ground ** }
PATTERN ( x_size = 50,
y_size = 50,
name = CHECK,
QRT Ray Tracer Page 2 QRT Sample Programs
RECTANGLE (
start_x = 0,
start_y = 0,
end_x = 25,
end_y = 25,
diff = (1, .2, .2)
)
RECTANGLE (
start_x = 25,
start_y = 25,
end_x = 50,
end_y = 50,
diff = (1, .2, .2)
)
)
{ ** The actual world starts here ** }
BEGIN_BBOX
BEGIN_BBOX { ** This is the lower half ** }
BEGIN_BBOX
SPHERE ( loc = (0, 0, 0), { ** back ** }
radius = 20,
diff = (1, .1, .1),
)
SPHERE ( loc = (100, 0, 0),
radius = 20,
diff = (1, .1, .1),
)
INSTANCE_OF ( name = X_AXIS_QUAD,
loc = (0, 0, 0)
)
END_BBOX
BEGIN_BBOX { ** front ** }
SPHERE ( loc = (0, 0, 100),
radius = 20,
diff = (1, .1, .1),
)
SPHERE ( loc = (100, 0, 100),
radius = 20,
diff = (1, .1, .1),
)
QRT Ray Tracer Page 3 QRT Sample Programs
INSTANCE_OF ( name = X_AXIS_QUAD,
loc = (0, 0, 100)
)
END_BBOX
INSTANCE_OF ( name = Z_AXIS_QUAD,
loc = (0, 0, 0)
)
INSTANCE_OF ( name = Z_AXIS_QUAD,
loc = (100, 0, 0)
)
END_BBOX
BEGIN_BBOX { ** This is the upper half ** }
BEGIN_BBOX { ** back ** }
SPHERE ( loc = (0, 100, 0),
radius = 20,
diff = (1, .1, .1),
)
SPHERE ( loc = (100, 100, 0),
radius = 20,
diff = (1, .1, .1),
)
INSTANCE_OF ( name = X_AXIS_QUAD,
loc = (0, 100, 0)
)
END_BBOX
BEGIN_BBOX { ** front ** }
SPHERE ( loc = (0, 100, 100),
radius = 20,
diff = (1, .1, .1),
)
SPHERE ( loc = (100, 100, 100),
radius = 20,
diff = (1, .1, .1),
)
QRT Ray Tracer Page 4 QRT Sample Programs
INSTANCE_OF ( name = X_AXIS_QUAD,
loc = (0, 100, 100)
)
END_BBOX
INSTANCE_OF ( name = Z_AXIS_QUAD,
loc = (0, 100, 0)
)
INSTANCE_OF ( name = Z_AXIS_QUAD,
loc = (100, 100, 0)
)
END_BBOX
{ ** four vertical cylenders ** }
INSTANCE_OF ( name = Y_AXIS_QUAD,
loc = (0, 0, 0)
)
INSTANCE_OF ( name = Y_AXIS_QUAD,
loc = (0, 0, 100)
)
INSTANCE_OF ( name = Y_AXIS_QUAD,
loc = (100, 0, 0)
)
INSTANCE_OF ( name = Y_AXIS_QUAD,
loc = (100, 0, 100)
)
END_BBOX
PARALLELOGRAM ( loc = (-10000, -60, -10000),
v1 = ( 20000, 0, 0),
v2 = ( 0, 0, 20000),
pattern = check,
xmult = 2,
ymult = 2,
diff = (.1, 1, .1)
)
OBSERVER ( loc = (-50, 70, 250),
lookat = (50, 50, 50)
)
QRT Ray Tracer Page 5 QRT Sample Programs
LAMP ( loc = (70, 250, 350),
radius = 5,
dist = 350
)
FOC_LENGTH = 70
SKY ( horiz = (0, 0, .55),
zenith = (0, 0, .25),
dither = 4
)
File Two
{**********************************
Room - brick walls and a
mirrored sphere in the middle.
**********************************}
FILE_NAME = ROOM.RAW
{ ********* Some pattern definitions ********** }
PATTERN ( x_size = 16, { ** A checkered pattern ** }
y_size = 16,
name = CHECK,
RECTANGLE (
start_x = 0, start_y = 0,
end_x = 8, end_y = 8,
diff = (1, .20, .20);
)
RECTANGLE (
start_x = 8, start_y = 8,
end_x = 16, end_y = 16,
diff = (1.00, .20, .20);
)
)
QRT Ray Tracer Page 6 QRT Sample Programs
PATTERN ( x_size = 80, { ** brick pattern ** }
y_size = 50,
name = BRICK,
RECTANGLE (
start_x = 0, start_y = 2,
end_x = 18, end_y = 23,
diff = (1.00, .20, .20);
)
RECTANGLE (
start_x = 62, start_y = 2,
end_x = 80, end_y = 23,
diff = (1.00, .20, .20);
)
RECTANGLE (
start_x = 22, start_y = 2,
end_x = 58, end_y = 23,
diff = (.80, .20, .20);
)
RECTANGLE (
start_x = 2, start_y = 27,
end_x = 38, end_y = 48,
diff = (.85, .35, .10);
)
RECTANGLE (
start_x = 42, start_y = 27,
end_x = 78, end_y = 48,
diff = (.70, .25, .20);
)
)
{ ******* Now for the room itself ******** }
{ ** four walls ** }
PARALLELOGRAM ( loc = ( 0, 0, -100),
v1 = (100, 0, 0),
v2 = ( 0, 50, 0),
pattern = BRICK,
xmult = .2,
ymult = .2
)
PARALLELOGRAM ( loc = ( 0, 0, 100),
v1 = (100, 0, 0),
v2 = ( 0, 50, 0),
pattern = BRICK,
xmult = .2,
ymult = .2
)
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PARALLELOGRAM ( loc = (100, 0, -100),
v1 = ( 0, 0, 200),
v2 = ( 0, 50, 0),
pattern = BRICK
xmult = .2,
ymult = .2
)
PARALLELOGRAM ( loc = ( 0, 0, -100),
v1 = ( 0, 0, 200),
v2 = ( 0, 50, 0),
pattern = BRICK,
xmult = .2,
ymult = .2,
)
{ ** a floor ** }
PARALLELOGRAM ( loc = ( 0, 0, 100),
v1 = (100, 0, 0),
v2 = ( 0, 0, -200),
diff = ( 0, 1, 0),
pattern = CHECK
)
{ ** several mirrored spheres ** }
BEGIN_BBOX
SPHERE ( loc = (50, 25, -40),
radius = 15,
diff = (0, 0, 0),
mirror = (.9, .9, .9),
dither = 0
)
END_BBOX
BEGIN_BBOX
QUADRATIC ( loc = (30, 0, -20),
a = 1,
b = 0,
c = 1,
d = 50,
QRT Ray Tracer Page 8 QRT Sample Programs
xmin = -10,
xmax = 10,
ymin = 0,
ymax = 50,
zmin = -10,
zmax = 4,
diff = (.7, 0, 0),
dither = 4,
reflect = .4,
sreflect = 30
)
END_BBOX
{ ** An observer ** }
OBSERVER ( loc = (40, 25, 30),
lookat = (50, 0, -100)
)
{ ** Two lamps ** }
LAMP ( loc = (65, 70, 20),
radius = 5,
dist = 45
)
LAMP ( loc = (30, 55, -10),
radius = 5,
dist = 25
)
SKY ( horiz = (0, 0, .55),
zenith = (0, 0, .25),
dither = 4
)
QRT Ray Tracer Page 9 QRT Sample Programs
