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GALAXY INCLUDE FILE for Persistence of Vision 3.x
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Created by Chris Colefax, 1 February 1998
Updated 9 August 1998: updated for POV-Ray 3.1
INSTALLATION
QUICK START
UNDERSTANDING THE DIFFERENT GALAXY.* FILES
GALAXY OPTIONS
TROUBLESHOOTING
COPYRIGHT AND LEGAL INFORMATION
CONTACTING THE AUTHOR
The Galaxy Include File package consists of four files (Galaxy.inc,
Galaxy.bg, Galaxy.obj and Galaxy.sf) which work separately and together,
depending on the desired effect. All four files should be copied to
one of the directories (folders) in your POV-Ray library path. Normally
this is the INCLUDE sub-directory of the directory where you installed
POV-Ray, so if you installed POV-Ray in C:\POVRAY you should copy the files
to C:\POVRAY\INCLUDE. On a Windows 95 system, this is probably something
like:
C:\Program Files\POV-Ray for Windows\Include
On UNIX and similar systems, where filenames are case-sensitive, you may
have to rename the four include files so that the filenames are all uppercase.
This will enable you to render the sample files without modification.
The Galaxy Include File package allows you to create a variety of outer-
space scenes which can be used on their own or as backgrounds to other
scenes and animations. In addition to spiral galaxies, the Galaxy Include
File package can also create starfields, star clusters, nebulae, comets,
and meteor showers. You can easily create a galaxy scene containing a
selection of these elements by adding the following lines to a POV-Ray
scene file:
#declare galaxy_seed = 123456789;
#include "GALAXY.INC"
You can choose any positive or negative integer you like for the
galaxy_seed value. When you render this scene, the Galaxy Include File
will select random options, and then use Galaxy.bg, Galaxy.obj, and
Galaxy.sf to create the galaxy scene. In addition to changing the seed
number, you can use a variety of options to modify the galaxy scene.
To use any of these options just add the following line to your scene file,
before including Galaxy.inc:
#declare [variable-name] = [value]
substituting the desired variable name and value where appropriate.
Note that Galaxy.inc (or any of the Galaxy.* files) should never be
included at the start of a scene (like colors.inc or textures.inc).
They should only be included after declaring the desired galaxy options.
As well as creating random galaxy scenes using Galaxy.inc, you can use
Galaxy.bg, Galaxy.obj, and/or Galaxy.sf separately to build custom galaxy
scenes piece by piece. You can include any of the four Galaxy.* files as
many times as you want in a single POV-Ray scene, declaring separate options
for each Galaxy.* inclusion. Note that you don't have to redeclare any
options that are common to any or all of the Galaxy.* files, eg:
// COMMON GALAXY OPTIONS
#declare galaxy_colour1 = < 1.3, 1.2, .8> ;
#declare galaxy_colour2 = < 1, .5, .3 > ;
#declare galaxy_rotate = < 90, 180, 0> ;
// GALAXY BACKGROUND
#declare galaxy_bgstars = 4;
#declare galaxy_bgnebula = off;
#declare galaxy_nebula_sphere = 5;
#include "GALAXY.BG"
// GALAXY OBJECTS
#declare galaxy_object_name = "Nebula3"
#declare galaxy_cluster_name = "Star4"
#include "GALAXY.OBJ"
#declare galaxy_object_name = "Comet2"
#declare galaxy_cluster_name = ""
#include "GALAXY.OBJ"
In the above example the same colours and rotation are applied to each
element of the galaxy scene, without having to redeclare them each time
you include one of the Galaxy.* files.
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UNDERSTANDING THE DIFFERENT GALAXY.* FILES
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As mentioned above, the four different files of the Galaxy Include File
package can be used in a variety of ways, depending on how you wish to
create your galaxy scene. The files are:
The Galaxy Backgrounds File (GALAXY.BG): this include file is used to
create a selection of starfield and nebula pigments (including a Milky Way
pigment), which can either be mapped directly to the sky_sphere, or to an
actual sphere object. Although Galaxy.bg allows you to create backgrounds
quite easily, the file gives you little control over the exact shape of the
nebulae, and the starfields are not suitable for anti-aliasing or
animations in which the camera is moved or altered in some way.
The Galaxy Starfield File (GALAXY.SF): this include file is used to create
starfields consisting of actual objects, rather than textures. Because of
this, the starfields can be anti-aliased and animated very well, and
improved programming means that the parsing takes about one fifth of the
time needed for previous versions of the Starfield Include File. Galaxy.sf
can create three different types of stars, and can be used in conjunction
with Galaxy.bg to create stars larger than one pixel in size.
The Galaxy Objects File (GALAXY.OBJ): this include file is used to create
and position a selection of outer-space objects, including four different
feature stars, six different nebulae, five different galaxies, three
different comets, and two different meteors. The objects can be positioned
individually, or in random clusters (eg. star clusters or meteor showers).
The Galaxy Include File (GALAXY.INC): this include file uses the above three
files to create random galaxy scenes. Galaxy.inc selects random options for
the other files, including colours, object types, scaling, rotation, etc.,
and can automatically include the other files into your POV-Ray scene, making
it quick and easy to use the Galaxy Include File package without having to
declare separate options for each of the Galaxy.* files.
This section explains the various options that can be used with Galaxy.inc,
as well as the options that can be used separately with Galaxy.bg,
Galaxy.obj, and Galaxy.sf.
Note that the Galaxy Include File package supports both British and
American English, eg: galaxy_colour and galaxy_color are interchangeable,
as are galaxy_colouration and galaxy_coloration, etc.
GALAXY INCLUDE FILE OPTIONS
The options in this section apply to Galaxy.inc.
galaxy_seed
This is the random number seed used for all random aspects of the Galaxy
Include File package. Changing this number can result in vastly different
galaxy scenes, and any positive or negative integer accepted by POV-Ray can
be used. The default galaxy_seed value is 0. Each time you include
Galaxy.inc, a new galaxy_seed value is chosen at random. To find out the
new value, see debug_options.
galaxy_colour
Use this option to change the overall colour of the galaxy scene. The
exact result of changing this option depends on the current colour of
the galaxy scene, eg. if the current galaxy scene is predominantly green,
setting galaxy_colour to < 1.5, 0.1, 1> will increase the amount of red
in the scene, decrease the amount of green, and leave the blue unaltered,
resulting in a purple coloured galaxy.
The default galaxy_colour value is < 1, 1, 1> (which has no effect).
galaxy_colouration
Use this option to increase of decrease the amount of colour in the galaxy
scene. Good values range from 0 (little or no colour) to 1 or larger (very
saturated colour). Setting this option to a low value means that the
galaxy_colour option has more of an effect.
The default galaxy_colouration value is 0.5
galaxy_colour_turb
Use this option to alter the amount of colour variation between different
elements of the galaxy scene. Setting this option to 0 results in a
monochromatic galaxy scene, while larger values give greater colour
variation. The default galaxy_colour_turb value is 0.2
galaxy_intensity
Use this option to increase or decrease the overall visibility of the
galaxy scene. Good values usually lie somewhere between 0 (completely
transparent) and 5 (very opaque).
The default galaxy_intensity value is 1
galaxy_rotate
This option is a vector that is used to rotate the galaxy scene as a whole.
It can be useful when you want to create the illusion of movement in an
animation, without having to transform the camera and all the other objects
in a scene. The default galaxy_rotate value is < 0, 0, 0>
galaxy_distance
All the objects in a galaxy scene are arranged around a giant sphere,
usually surrounding the camera. You can use this option to set the size of
this sphere. The default value is 10000, which should be sufficient for
most scenes and animations. If the rest of the objects in your scene are
this size or larger, you may need to increase this value. However, values
that are too large may result in disappearing objects, or cause POV-Ray to
crash when rendering the scene.
galaxy_origin
As mentioned above, the objects in a galaxy scene are arranged around a
giant sphere. By default this sphere is centred around < 0, 0, 0>, but
you can use this option to change this value.
galaxy_bg
Use this option to disable the elements of the galaxy scene created by the
Galaxy Backgrounds File (Galaxy.bg). Setting this option to false (or off)
removes the background stars, background nebulae, and nebula sphere from
the galaxy scene. To remove these elements individually, see Background File Options.
galaxy_objects
Use this option to disable the elements of the galaxy scene created by the
Galaxy Objects File (Galaxy.obj). Setting this option to false (or off)
removes any feature nebulae, stars, comets, star clusters, or meteor
showers from the galaxy scene. Note that this option is always set to
false after including Galaxy.inc; if you wish to include Galaxy.inc a
second time (or third, fourth, etc.) and have it automatically create galaxy
objects, you must manually set galaxy_objects to true before including
Galaxy.inc.
galaxy_starfield
Use this option to remove the starfield objects in a galaxy scene created by
the Galaxy Starfield File (Galaxy.sf). Note that this option is always
set to false after including Galaxy.inc; if you wish Galaxy.inc to
automatically create another starfield, you must manually set
galaxy_starfield to true before including Galaxy.inc.
options_only
Setting this option to true will cause Galaxy.inc to declare all the options
it uses for Galaxy.bg, Galaxy.obj, and Galaxy.sf, but these three files will
not be automatically included. You can use this to then alter selected
galaxy options, before including some or all of the remaining Galaxy.* files,
eg. say you have discovered you like the galaxy produced by using 7362512
as the galaxy_seed value, but you want to change the galaxy object used:
#declare galaxy_seed = 7362512;
#declare options_only = true;
#include "GALAXY.INC"
#declare galaxy_object = "Galaxy2"
#include "GALAXY.OBJ"
#include "GALAXY.BG"
#include "GALAXY.SF"
Note that setting options_only to true is the same as setting galaxy_bg,
galaxy_objects, and galaxy_starfield to false.
debug_options
Setting this option to true will cause Galaxy.inc to output all the random
option values it uses to POV-Ray's debug stream. You can then use the +GD
command-line switch, or the Debug_File INI file setting, to direct the
debug stream to a file. This file can then be altered as desired, and
included directly into your scene before including Galaxy.bg, Galaxy.obj,
and/or Galaxy.sf (see the Rand.pov and Rand.ini files for an example of how
this option can be used).
GALAXY BACKGROUNDS FILE OPTIONS
The options in this section apply to Galaxy.bg. In addition to the
options below, the Galaxy Backgrounds File supports the galaxy_intensity,
galaxy_rotate, galaxy_distance, and galaxy_origin options, as detailed above.
galaxy_bgstars
This option specifies the type of background star pigment mapped to the
sky_sphere. Values range from 1 (sparse) to 3 (dense), and 4 (sparse) to
6 (dense). The first group has a mixture of faint and light stars, while
the second is mostly composed of bright stars of different colours. If you
don't want any background stars (for an animation, say), set this option
to false. The default galaxy_bgstars value is 2
galaxy_bgnebula
This option specifies the type of nebula pigment mapped to the sky_sphere.
Possible values are:
1 - Default nebula
2 - Light reflection nebula
3 - Nebula criss-crossed by dark gas lanes
4 - Spidery nebula
5 - Dense reflection nebula
6 - Milky Way pattern
Values 1 to 5 correspond roughly with the nebulae created by Galaxy.obj
(see galaxy_object_name). If you don't want a background nebula, set this option
to false. The default galaxy_bgnebula value is 6
galaxy_nebula_sphere
Use this option to create a large sphere (the radius is specified by the
galaxy_distance option) mapped with a nebula pigment. Possible values are
1 to 5, corresponding to the galaxy_bgnebula option. If you don't want a
nebula sphere, set this value to false.
The default galaxy_nebula_sphere value is 1
galaxy_nebula_ambient
Use this option to change the ambient light value of the nebula sphere.
The default galaxy_nebula_ambient value is < 1, 1, 1>
galaxy_colour1, galaxy_colour2, galaxy_colour3
Use this option to set the RGB colour value used to create the galaxy
background pigments. For a monochromatic galaxy scene, only declare
the first option; for a scene that uses two colours declare both
galaxy_colour1 and galaxy_colour2. Finally, to add another colour to
the galaxy pigments declare all three galaxy_colour options.
The default galaxy_colour1 value is < 1, 1, 1> (White).
galaxy_star_colouration
This option sets the colour saturation used by the six background star
pigments, and by the Milky Way pigment. Good values range from 0 (no
colour) to 1 (complete colour). An interesting effect can be achieved by
using negative numbers, which result in the stars being the opposite colour
to the nebulae and other objects in the galaxy scene.
The default galaxy_star_colouration value is 0.2
galaxy_pattern_scale
Use this option to alter the size of the patterns used to create the
galaxy background pigments. Changing this option does not alter the general
shape of the pigments; it only changes the scaling of the patterns used
within each pigment. The default galaxy_pattern_scale value is 1
galaxy_pattern_origin
Use this option to translate the origin of the patterns used to create the
galaxy background pigments. Changing this option can completely alter the
shapes created by the pigments, and can be changed gradually within an
animation to create dynamic nebulae, etc.
The default galaxy_pattern_origin is < 0, 0, 0>
galaxy_turb_origin
Many of the galaxy pigments use some sort of turbulence; changing this
option translates the origin of the turbulence before it is applied to the
pigment. You can use this option to alter the shapes of various pigments,
or to animate the turbulence applied to the pigments.
The default galaxy_turb_origin is < 0, 0, 0>
galaxy_declare_only
Setting this option to true stops Galaxy.bg from actually creating the
sky_sphere or nebula sphere to which the galaxy background pigments are
mapped. Instead, the file declares each of the 12 pigments separately, so
that you can then use them in the ways you use any other pigment. The
pigment names are BGStars? (from 1 to 6), BGNebula? (from 1 to 5), and
BGMilkyWay. Each of the pigments is designed to be used at unit size, but
they can be scaled or transformed any way you want, eg:
#declare galaxy_declare_only = true;
#include "GALAXY.BG"
sky_sphere {
pigment {BGStars3}
pigment {BGMilkyWay rotate z * 45}
pigment {BGNebula5 scale 2}
pigment {BGNebula1 rotate < 60, 50, 0>}}
box {< -1, -1, -1>, < 1, 1, 1>
pigment {BGStars6} finish {phong .5}}
Note that setting galaxy_declare_only to true is the same as setting
galaxy_bgstars, galaxy_bgnebula, and galaxy_nebula_sphere to false.
GALAXY STARFIELD FILE OPTIONS
The options in this section apply to Galaxy.sf. In addition to the
options below, the Galaxy Starfield File supports the galaxy_seed,
galaxy_rotate, and galaxy_origin options, as detailed above.
star_count
This option sets the number of star objects created. The larger the number,
the longer the parsing time and memory required.
The default star_count value is 1000
star_colour
This option sets the RGB colour value of the stars.
The default star_colour value is < 0.9, 0.9, 0.9>
star_type
This option selects the pigment used on each star object. Possible
values are:
1 - Plain circular star (default)
2 - Circular star with halo
3 - Circular star with six evenly spaced rays
star_scale
Use this option to increase or decrease the size of the star objects. By
default the stars are designed to look best when rendered at resolutions
between 320x240 and 640x480; you may wish use smaller numbers for larger
resolutions, and vice-versa.
The default star_scale value is 1
star_distance
The star objects are arranged around a large sphere; this option sets the
radius of this sphere. The default value is 20000, which should be
sufficient for most scenes and animations. If the rest of the objects in
your scene are this size or larger, you may need to increase this value.
However, values that are too large may result in disappearing objects, or
cause POV-Ray to crash when rendering the scene.
star_spread
This option sets the difference between the distances to the closest
(largest) star and the farthest (smallest) star. The option is expressed
as a percentage of the star_distance, eg: the default value of 1 means that
the stars lie somewhere between 20000 and 40000 units away (40000 being
equal to 20000 plus 20000 times 1). Setting this option to 0 would result
in all the star objects being the same distance from the origin.
star_distribution
This option sets the ratio of large (close) stars to small (far) stars.
The default value of 1 results in equal numbers of each. Values larger
than 1 give more large stars, while values smaller than 1 give more small
stars.
star_colour_turb
Use this option to alter the amount of colour variation between different
stars. Setting this option to 0 results in stars all of the same colour,
while larger values give greater colour variation.
The default star_colour_turb value is 0.2
star_brightness_turb
Use this option to set the amount of brightness variation between different
stars. Setting this option to 0 results in stars all of the same brightness,
while larger values give greater brightness variation.
The default star_brightness_turb value is 0.5
GALAXY OBJECTS FILE OPTIONS
The options in this section apply to Galaxy.obj. In addition to the
options below, the Galaxy Objects File supports the following options
detailed above:
galaxy_seed, galaxy_colour_turb, galaxy_intensity,
galaxy_rotate, galaxy_distance, galaxy_origin
galaxy_colour1, galaxy_colour2, galaxy_colour3, galaxy_star_colouration,
galaxy_pattern_scale, galaxy_pattern_origin, galaxy_turb_origin
galaxy_object_name
Use this option to select which galaxy object you wish to use. Possible
values are (the case of the strings is not important):
Star1, Star2, Star3, Star4
Nebula1, Nebula2, Nebula3, Nebula4, Nebula5, Nebula6
Galaxy1, Galaxy2, Galaxy3, Galaxy4, Galaxy5
Comet1, Comet2, Comet3
Meteor1, Meteor2
As a shortcut you can just use the first and last letters of the object
name, eg. S3 for Star3, or N4 for Nebula4. If you don't want to create
a galaxy object, set this value to an empty string.
The default galaxy_object_name is Nebula1
galaxy_object_scale
Use this option to increase of decrease the size of the galaxy object.
The default galaxy_object_scale value is 1
galaxy_object_rotate
Use this option to rotate the galaxy object. The object is rotated around
the viewing axis, so only one float value is required.
The default galaxy_object_rotate value is 0
galaxy_object_flatten
Use this option to flatten Galaxy, Comet, and Meteor objects. Good values
lie somewhere between 0 (no flattening) and 1 (completely flattened). You
can also use negative numbers to widen the object instead of thinning it.
The default galaxy_object_flatten value is 0.2
galaxy_object_position
Use this option to move the galaxy object and cluster objects. The
x-component of this option specifies the altitude of the objects, while the
y-component specifies the azimuth of the objects. The z-component is
ignored. The default value of < 0, 0, 0> positions the objects directly
perpendicular to the z-axis. North lies along the z-axis and up lies along
the y-axis. Therefore, < 90, 0, 0> positions the object directly above the
origin, and <-90, 0, 0> positions the objects below the origin. < 0, 90, 0>
positions the objects to the east (along the x-axis), < 0, -90, 0> positions
the objects to the west (along the negative x-axis), and < 0, 180, 0>
positions the objects to the south (along the negative z-axis). You can
combine these two movements using the galaxy_object_position value to place
the galaxy object and cluster objects anywhere in the sky.
galaxy_cluster_name
In addition to a single galaxy object you can create a cluster of randomly
positioned, sized, and coloured objects. Use this option to select which
object you wish to use for the cluster, using the same selection as
the galaxy_object_name option. If you don't want to create
a cluster of objects, set this option to an empty string.
The default galaxy_cluster_name is Star1
galaxy_cluster_objects
Use this option to set the number of objects you want to create in the
cluster. The default galaxy_cluster_objects value is 6
galaxy_cluster_scale
Use this option to increase of decrease the size of the individual objects
in the cluster (not the overall size of the cluster itself). The default
galaxy_cluster_scale value is half of the galaxy_object_scale value.
galaxy_cluster_rotate
Use this option to rotate each individual object in the cluster (not the
cluster as a whole). The default galaxy_cluster_rotate value is the same
as the galaxy_object_rotate value.
galaxy_cluster_spread
Use this option to increase the amount of space between the individual
cluster objects. The option is expressed as an angle, where 0 results in
all the objects being clustered at the same position, while 360 spreads the
objects across the entire sky.
The default galaxy_cluster_spread value is 15 degrees.
galaxy_scale_turb
Use this option to alter the amount of size variation between individual
cluster objects. Setting this option to 0 results in all the cluster
objects being the same size, while larger values give greater size
variation. The default galaxy_scale_turb value is 0.5
galaxy_rotate_turb
Use this option to alter the amount of variation (in degrees) between the
rotations of individual cluster objects. Setting this option to 0 results
in all the cluster objects being rotated by the same amount, while setting
this option to 360 gives objects rotated by completely random angles.
The default galaxy_rotate_turb value is 0
galaxy_declare_only
Setting this option to true stops Galaxy.obj from actually creating the
galaxy object and cluster objects. Instead, these objects are declared
(as galaxy_object and galaxy_cluster_object respectively) as textured
discs which can be used like any other object. The discs are scaled
and rotated according to the relevant options above, and are centred
at the origin perpendicular to the z-axis.
This section contains some common problems you might encounter while using
the Galaxy Include File package, and instructions on how to fix these
problems.
Q) POV-Ray crashes when I try to render my galaxy scene?
A: This may be caused by objects being larger than POV-Ray's allowed limit.
To make the objects smaller, try decreasing the galaxy_distance value
(the default is 10000), and also the star_distance value if you have
declared this separately. If reducing this value doesn't help, try
reducing the max_trace_level of your scene; the Galaxy Include File
automatically increases the value for each object it creates, so add
the line:
global_settings {max_trace_level 10}
after including any of the Galaxy.* files.
Q) POV-Ray crashes before even starting to render my galaxy scene?
A: This is probably caused by a lack of memory; try decreasing your
star_count value, or your galaxy_cluster_objects value if they
are quite large. Otherwise, check the error message POV-Ray gives
you; you have probably tried to redeclare an option that has
already been used by one of the Galaxy Include Files; ensuring that
options are always declared as the same type (eg. vectors are always
redeclared as vectors, etc.) should remove the problem.
Q) POV-Ray renders my galaxy scene, but it is very slow?
A: This is probably caused by very large objects; try reducing the
galaxy_distance and/or star_distance options as detailed in the first
question. Note, however, that when using many complex pigments like
those used by the Galaxy Include Files a certain amount of calculation
time is to be expected.
Q) I have created an animation using the Galaxy Include File, but the
stars seems to flicker annoyingly?
A: This is caused by using background stars (mapped to the sky_sphere)
which are only suitable for still scenes. Try setting the
galaxy_sky_sphere option to false before including the Galaxy.* files
to remove the problem.
Q) I am using the galaxy_pattern_origin and/or galaxy_turb_origin options,
and there are some strange artefacts in my galaxy scene?
A: This is caused by problems with POV-Ray's internal pigment mapping
functions; you should be able to fix the problem by using smaller values
for the galaxy_pattern_origin and galaxy_turb_origin options.
Q) I have tried declaring some of the options, but nothing changes?
A: Make sure that you have declared all the desired options before
including any of the Galaxy.* files. The files are not designed
to be included once at the beginning of a scene.
Q) How can I use the Galaxy Include File with Moray (or another modeller)?
A: First export your scene from your modeller to a POV file. Then just add
your desired galaxy options to this file, and include the desired
Galaxy.* files before rendering the scene. If your modeller uses a
right handed coordinate system (like Moray) declare these two options
before any others to ensure that the galaxy objects are positioned
properly:
#declare galaxy_distance = < -1, 1, 1> * 10000;
#declare galaxy_rotate = < -90, 180, 0> ;
Q) I want to fly around a galaxy I have created, but this doesn't seem possible?
A: This is because the galaxy objects are designed to generally be viewed in the background, and so they are placed at a great distance from the other objects in a scene.
You can, however, use any of the galaxy objects just as you would any other object in POV-Ray, so that it can translated, rotated, scaled, etc.
Just use the galaxy_declare_only option to create the galaxy_object, eg:
#declare galaxy_colour1 = < 1.3, 1.2, .9> ;
#declare galaxy_colour2 = < .4, .8, 1> ;
#declare galaxy_cluster_name = ""
#declare galaxy_object_name = "Galaxy3"
#declare galaxy_object_flatten = 0;
#declare galaxy_declare_only = true;
#include "Galaxy.obj"
object {galaxy_object rotate x * 90 scale 10}
camera {location < 1, 2, -3> look_at < 0, .5, 0>}
Q) I rendered my galaxy image using anti-aliasing and all the stars disappeared?
A: This is usually the result of using the Galaxy.bg file to create stars as a pigment on the sky_sphere.
Stars created in this manner will not work well with anti-aliasing, and it is usually a good idea to set the galaxy_bgstars option to false to remove these background stars if you plan to render the image with anti-aliasing turned on.
In their place, you should use the stars created by Galaxy.sf, as these are actual objects with pigments that have already been anti-aliased.
The best settings for a scene usually depend on the rendering size, but for an 800x600 image these settings work quite well:
#declare star_count = 5000;
#declare star_scale = .5;
#include "Galaxy.sf"
Q) I can't get media to work with the Galaxy Include Files?
A: Due to the way the Galaxy Include Files create the galaxy objects and stars, the results obtained using POV-Ray 3.1's media can be unpredictable.
Part of the problem is caused by the galaxy objects usually being at a great distance from the other objects in a scene, which makes it very difficult for POV-Ray to calculate accurate media interactions.
One solution is to decrease the galaxy_distance option to bring the galaxy objects closer to the camera, although this can make it difficult to place other objects correctly.
A better solution might be to use localised media container objects, rather than atmospheric media, to only place the media in those sections of the scene that it is required for.
This should give you more control over the media interactions in your scene, and possibly increase the rendering speed as well.
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COPYRIGHT AND LEGAL INFORMATION
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The Galaxy Include File package, including Galaxy.inc, Galaxy.bg, Galaxy.obj, Galaxy.sf, all documentation, and
associated sample *.POV files are Copyright 1998 by Chris Colefax. Full
permission is granted to the user to modify any or all of the files for
his/her own use. If modified versions are to be distributed the user
should make clear the modifications that have been made by him/herself.
The Galaxy Include File package may be bundled with or without other
software on CD-ROM collections, Bulletin Board systems and other file
archives, providing that all associated files, including documentation and
samples, are included. I would also request that persons intending to
distribute the Galaxy Include File package in this manner or otherwise
would first contact me to ensure that
they are in possession of the latest available version.
Further, no restrictions of any sort are placed on the usage of the include
files themselves (Galaxy.inc, Galaxy.bg, Galaxy.obj, and Galaxy.sf), and scene files or images created using the include
files remain entirely the property of the user or users who have created
them. I claim no liability or responsibility for damages or loss resulting
from usage of the include files, or any part of the include file package.
If you wish to contact me with bug reports, bug fixes, criticisms,
comments, suggested improvements, questions, etc. you can reach me by
email at:
ccolefax@geocities.com
or by regular mail at:
Chris Colefax
PO Box 110
Kuranda, Queensland
Australia 4872
POV-RayTM and Persistence of VisionTM are registered trademarks of the POV-Ray TeamTM