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152 lines
4.9 KiB
Text
152 lines
4.9 KiB
Text
1. INTRODUCTION
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===============
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Welcome to OpenCTM!
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OpenCTM is a file format, a software library and a tool set for compression of
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3D triangle meshes. The geometry is compressed to a fraction of comparable file
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formats (3DS, STL, COLLADA, VRML...), and the format is easily accessible
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through a simple, portable API.
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The library is written in portable C (C99), and should compile nicely on any
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32/64-bit system regardless of endianity (big endian or little endian).
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2. LICENSE
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==========
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The OpenCTM API and the OpenCTM tools are released under the zlib/libpng
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license (see LICENSE.txt).
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3. CREDITS
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==========
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Many people have helped out in the development process of OpenCTM, with
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valuable feedback, programming efforts, test models and conceptual ideas.
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Also, OpenCTM relies heavily on many other open source projects.
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Here is an incomplete list of persons that deserve credit:
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- Igor Pavlov (LZMA library)
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- Jonas Innala (COLLADA importer, Maya exporter plugin)
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- Ilian Dinev (help with the OpenCTM file format design and the LWO loader)
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- Lee Thomason (TinyXML)
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- Diego Nehab (RPly - for loading PLY files)
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- Lev Povalahev, Marcelo E. Magallon, Milan Ikits (GLEW)
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- Thomas G. Lane, Guido Vollbeding (libjpeg)
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- Jean-loup Gailly, Mark Adler (zlib)
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- Daniel Karling (pnglite)
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During the development of OpenCTM, the following software has been used
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extensively:
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- Ubuntu (www.ubuntu.com)
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- Blender (www.blender.org)
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- GCC (gcc.gnu.org)
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- SciTE (www.scintilla.org/SciTE.html)
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- Notepad++ (notepad-plus.sourceforge.net)
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- Smultron (smultron.sourceforge.net)
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Legal notices:
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- This software is based in part on the work of the Independent JPEG Group.
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4. CHANGES
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==========
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v1.0.3 - 2010.01.15
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-------------------
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- Added support for PNG format textures (ctmviewer).
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- Added support for LightWave LWO files (ctmconv and ctmviewer).
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- Added support for Geomview OFF files, e.g. as used by the Princeton Shape
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Benchmark (ctmconv and ctmviewer).
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- Improved the OBJ file loader (ctmviewer and ctmconv).
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- Experimental support for VRML 2.0 files - export only (ctmconv and ctmviewer).
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- Made it possible to run ctmviewer without command line arguments.
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- Improved the normal calculation algorithm (ctmviewer and ctmconv).
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- Normals are no longer exported if no normals were present in the input file
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(ctmviewer).
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v1.0.2 - 2009.12.13
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-------------------
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- Added an OpenCTM exporter plugin for Maya [Jonas Innala].
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- Added the possiblity to save and load files from ctmviewer, effectively
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turning it into a quick and simple converter tool (without all the options
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in the ctmconv program, though).
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- Added a function to load texture files from ctmviewer.
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- Improved the camera control in ctmviewer (panning with the right mouse
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button, zooming with the middle mouse button and the mouse wheel, feature
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focusing by double clicking, Y/Z up axis selection and "fit to screen"
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function).
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- Added a GUI dialog for showing errors in ctmviewer (this is especially useful
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under Windows, where console output is disabeled).
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- Added an option for calculating the normals in ctmconv (if the input file
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does not have normals).
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- Added options for turning off normals, texture coordinates and/or vertex
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colors for the output file in ctmconv.
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- Added manuals for ctmviewer and ctmconv (man pages).
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- Added a "make install" build target for Mac OS X and Linux for simple system
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wide installation (see COMPILING.txt).
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- NOTE: The Linux/X11 version of ctmviewer now reqires GTK+ 2.0.
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v1.0.1 - 2009.11.15
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-------------------
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- Notable reduction of the memory footprint by tuning of the LZMA compression
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parameters.
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- Added a Wavefront OBJ file importer/exporter.
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- Some improvements to ctmviewer and ctmconv.
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- Some directory structure and build system cleanups.
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v1.0 - 2009.11.09
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-----------------
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- Added a COLLADA converter module to the ctmconv program [Jonas Innala].
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- Added Python bindings and a demo Python program.
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- Improved the internal mesh integrity checking, to minimize the risk of invalid
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data processing.
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- Improved the file format specification document.
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v0.8 (beta) - 2009.09.14
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------------------------
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- Introduced a new API function for controlling the compression level
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(ctmCompressionLevel), and set the default compression level to 5 (rather
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than 9, which would eat a lot of memory, usally without much difference).
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- Changed the name "texture map" in the API to "UV map" (and all
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corresponding constant and function names). This is more in line with
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the nomenclature of most 3D authoring software, and avoids the confusion
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with the term texture mapping in 3D hardware (which is not limited to
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2D UV mapping coordinates).
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- A few updates to the documentation.
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v0.7 (beta) - 2009.08.29
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------------------------
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- This was the first public release of OpenCTM.
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