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- Major changes since 3.0
- -----------------------
- Addition of CSG. "union", "intersect" and "difference" types.
-
- Animation support. Multi-frame image files, use of expressions, animated
- transformations, new keywords, including: shutter, frames, framelength,
- define, starttime. "linear" function, "time" and "frame" variables.
-
- Aggregate syntax changed. Rather than "define .... defend" with
- the aggregate type buried inbetween, syntax is "type ... end", where type
- is one of: grid, list, union, intersect, difference. Object naming
- is now accomplished by preceding one of the above with the "name" keyword
- followed by the name to assign to the aggregate.
-
- Torus, blob primitives added, courtesy of Mark Podlipec and Jochen Schwarze.
- Buggy superquadric primitive removed.
-
- Surface definition syntax and binding changed. Surface definition is now keyword-
- based. Note that the specular color of a surface is used to modify the color of
- reflected rays in 4.0. When converting 3.0 scripts to 4.0, the specular component
- and/or reflectivity may need to be modified.
-
- Improved antialiasing. Rather than using an adaptive scheme or nonadaptive
- "distributed" ray tracing, an adaptive jittered algorithm is used.
-
- Additional textures and light source types.
-
- Vastly improved performance when using many texturing functions.
-
- Many minor and not-so-minor bugfixes.
-