breve 2.1 beta now available for all platforms

Hello everybody,
I'm pleased to announce a beta release of breve 2.1 for all
platforms.  The beta can be downloaded from:

http://www.spiderland.org/breve2.1b/

All feedback and bug reports are greatly appreciated!

The following is a partial list of changes in breve 2.1b:

New features
- New elastic Spring simulation class (see documentation for class 
Spring).
- New fast 2d matrix manipulation class (see documentation for class 
Matrix2D). AltiVec accelerated, where supported by hardware.
- Fast chemical diffusion supported via Matrix2D class.
- Different patterns (dashed, dotted, etc) can be drawn for lines 
between objects.
- String length now given with | string |.
- Letters in strings can be read with string{ n }.
- Letters in strings can be replaced with string{ n } = "newstring".
- Physical collisions may now be disabled between specific object types.
- Faster physical simulation via "QuickStep" (see method 
enable-fast-physics in class Control).
- Various improvements to the Push programming language.
- Changes to Push programming language to match the Lisp implementation
- Implemented "discrepancy" method for comparing Push programs.
- Improved "Go to method..." popup menu (Mac OS X).
- Introduced basic support for transparent breve <=> Java bridge on Mac 
OS X.
- Major optimizations.

Bug fixes
- Fixed slowdowns and crashes on multiprocessor Macs.
- Fixed bug in cube/sphere collisions on -x axis.
- Fixed network server starting on wrong port on x86 machines
- Fixed copylist garbage collection bug
- Fixed disabled light detector
- Fixed bug using "@define" with strings.
- Fixed bug in Mobile method "set-label".
- Fixed incorrect rendering when bitmaps rendered after transparencies.



- jon klein

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