晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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ABOUT THE ILMBASE LIBRARIES 
----------------------------

Half is a class that encapsulates our 16-bit floating-point format.

IlmThread is a thread abstraction library for use with OpenEXR
and other software packages.  It currently supports pthreads and
Windows threads.

Imath implements 2D and 3D vectors, 3x3 and 4x4 matrices, quaternions
and other useful 2D and 3D math functions.

Iex is an exception-handling library.

If you have questions about using the IlmBase libraries, you may want
to join our developer mailing list.  See http://www.openexr.com for
details.


LICENSE
-------

The IlmBase source code distribution is free software.  See the file
named COPYING (included in this distribution) for details.


BUILDING ILMBASE
----------------

To build IlmBase on GNU/Linux or other UNIX-like systems, do this:

./configure
make
make install

unless you obtained IlmBase directly from git, in which case you
should first read README.git


Please type :

./configure --help

for a list of options in relation to building IlmBase libraries. In 
particular, peruse README.namespaces for information regarding the 
use of namespaces in IlmBase and OpenEXR.


See README.OSX for details on building IlmBase in MacOS X.

Do `make check` to run the IlmBase confidence tests.  They should all
pass; if you find a test that does not pass on your system, please let
us know.

Other UNIX variants haven't been tested, but should be easy to build.
Let us know if you're having problems porting IlmBase to a particular
platform.

All include files needed to use the IlmBase libraries are installed in the 
OpenEXR subdirectory of the install prefix, e.g. /usr/local/include/OpenEXR.


USING ILMBASE IN YOUR APPLICATIONS
----------------------------------

On systems with support for pkg-config, use `pkg-config --cflags
IlmBase` for the C++ flags required to compile against IlmBase
headers; and `pkg-config --libs IlmBase` for the linker flags required
to link against IlmBase libraries.

haha - 2025