CHANGELOG

v0.07.5
* Added procedural scenes
* Added box type
v0.07.4
* Updated janino version to 2.7.8
* Allow changing shading cache parameters for a quality/speed trade-off
* Fixed missing TriangleMeshLight shader in PluginRegistry
* Fixed self-intersection bias
* Fixed infinite loop in bih caused by small triangle
v0.07.3
* Fixed bump mapping to correctly treat black as the lowest point in the map
* Added command line override for samples paramter (affect bucket and multipas samplers)
* Added cubic bspline filter to multipass image sampler (via warp function)
* Fixed "usage of init" statistic report in BIH
* Added cubic bspline filter
* Fixed counting of secondary rays clipped by ray depth limit
* Added lattice sampling routines (experimental)
* Fixed CornellBox light source sampling
* Fixed all image readers/writer to use buffered I/O
* Added motion blur syntax for instances and objects in .sc files
* Added shutter parameter to camera to allow motion blur of scene objects even when the camera is static
* Camera and Instances are now controlled by moving matrices and may be motion blurred
* Added MovingMatrix4 class
* Removed eye/target/up syntax for describing camera transform (parameters only - not .sc syntax)
* Added total rays to statistics output
* Fixed filtering in y direction for BucketRenderer
* Fixes to QMC sigma table - no longer requires precomputation
* Implemented low sampling density for ImageBasedLight in fixed mode
* Added PerlinModifier
* Bug fix to writeVerbatimString() in binary scene writer
* Added sampler choice to image block in .sc parser
* Small bugfix to command line sampler choice
* Moved shading cache into new image sampler
* Added a new image sampler (MultipassRenderer - not multipass yet)
* Added statistics to count number of rays cast
* Removed "robust" intersection code for triangles and bezier patches
* Added sphereflake primitive
* Moved Nan/Inf check into LightServer, demoted to warning severity
* Fix to allow LDR images in IBL
* File browser in SunflowGUI remembers previous directory
* Modified Matrix4 class to only accept affine transformations
* Added cylinder primitive
* Removed getUniqueName method from SunflowAPI
* Fixed more potential locale issues with case conversion by forcing the ENGLISH locale to be used
* Renamed get/setCurrentFrame to currentFrame in SunflowAPI
* Renamed parse to include in SunflowAPI
* Added reset keyword to new scene file format
* Fixed access levels on certain classes in org.sunflow package
* Fixed spelling of absorption in glass shader - left backwards compatibility in SCParser
* Added reading/writing of Indigo's IGI file format
* Added GenericBitmap format for simple debugging tasks
* Added more robust file extension detection
* Refactored Bitmap loading/saving with plugin system
* Bug fix when reading interpolation types on non-english operating systems
* Added -translate command line parameter
* Added translate() method to convert any file format into the new ones
* New ascii/binary file formats (sca/scb)
* Added new colorspace options for color parameters (blackbody/spectrum)
* Changed the way colors are specified to SunflowAPI
* Upgraded to Janino 2.5.6
* Added camera shift option to pinhole and thinlens camera lenses
* Updated examples
* Moved scene parsers to plugin system
* Moved photon maps to plugin system
* Replaced object factories with PluginRegistry lookups
* Updated all parsers
* Added PluginRegistry and modified SunflowAPI to create objects through it instead of requiring users to create objects themselves
* Changed cornellbox primitive into the light block in the .sc parser
* Light objects can now specify their geometric represtentation at runtime
* Particle point positions can now be specified inline in the scene file
* Particle data files can now be scene relative (via include paths)
* Improved motion blur sampling
* Moved shaderOverride to an option

v0.07.2
* Filled in and corrected javadoc comments in org.sunflow.core package
* Upgraded to Janino 2.5.5
* Added experimental Ant build file
* Removed hard coded sRGB curve
* Fixes to bucket renderer anti-aliasing
* Camera motion blur
* Added bezier patch meshes to parser
* Added normal smoothing to FileMesh
* Implemented BVH2 case properly in BoundingIntervalHierarchy (needs benchmarking)
* Added binary STL format to FileMesh
* Upgraded to Janino 2.5.4
* Improvements to Geometry class to handle tesselation failures
* Created FileMesh class for on-demand loading of meshes (supports RA3/OBJ)
* Tweaks to Benchmark class for third parties
* Small bugfixes
* Added little_endian option for particle files

v0.07.1
* Added Modifier concept - used to implement bump/normal mapping at the moment
* Added bucket dumping debugging option to bucket render - saves out unfiltered buckets as they are rendered
* Fixed jitter option - added to SCParser image block
* Added basic absorbtion model to GlassShader
* Added ngon sampling to ThinLens for bokeh effects
* Renamed MeshLight to TriangleMeshLight
* Updated LightSource interface - lights must now do their own loop to take mutltiple samples
* Spherical triangle sampling for triangle lights
* New wireframe shader (-quick_wire command line option)
* Added calls to get triangle vertices
* Added camera space utility functions
* Upgraded to Janino 2.5.3
* Upgraded to Janino 2.5.2
* Added sun light to SunSkyLight - modified LightSource interface slightly
* Added support for "noinstance" keyword
* Unified instance handling in .sc parser
* Added -pathgi command line argument
* Added basic animation support
* Added SunSkyLight
* Added QuadMesh primitive type (using bilinear patches)
* Added real sphere lights
* Console display now outputs to stderr to allow stdout to be used for output redirection
* Added fisheye lens to .sc parser
* Added imgpipe display compatible with mental ray imgpipe protocol
* Experimental fix to light bleeding problem
* Removed -accel command line option
* Deprecated use of accel keyword in .sc files - the default is usually best
* Moved accel into an option parameter
* Added -filter command line option
* When baking a lightmap without viewdep, a camera is not required in the scene
* Added -bakedir command line option
* Added baking.viewdep option to control lightmap baking style
* Lightmap baking can now either be view-dependent (to the current camera) or orthographic (perpendicular to the point being shaded)
* Added XYZColor class to represent colors with CIE coordinates
* Rengereated golden images for Benchmark data
* Fixed a subtle problem with float/int constructors for the Color class
* Added lightmap baking - only triangular meshes are supported at the moment
* Renamed DLASurface to ParticleSurface
* SCParser: Made all the options in the image block optional
* Added fake spherical lights (approximated by point lights - using the trick from the Lightcuts paper)
* Bug fix to RA2Parser (was passing fov argument to camera incorectly)
* Added a method to dump Mesh objects to .obj files (usefull for procedural geometry debugging)
* Added DLASurface for efficient rendering of large sets of spheres
* Split Camera into CameraLens (which is an interface to generate rays in camera space) and an internal Camera class which rotates the rays into world space
* Upgraded to Janino 2.5.1
* Upgraded to Janino 2.5.0
* Parser now generates bezier patch primitives intead of triangles is the subdivs/smooth parameters are ommited
* Added exact Ray/Bezier-patch intersection code
* Added Teapot and Gumbo primitives, both using bezier patch descriptions
* Added Bezier patch mesh, which generates a triangle mesh at runtime
* Added janino-tesselatable primitive
* Added on demand tesselation of primitives
* Added a parser for hair curve data as export by Shave and Haircut (http://www.joealter.com)
* Added a hair curve primitive
* Implemented parameter system for all render object creation
* Textures are now loaded on demand, when they are first accessed
* Modified bucketOrder call in SunflowAPI to create inverted bucket orders
* Added InvertedBucketOrder
* Added RandomBucketOrder
* Added Box primitive
* Removed SimpleShader from parser classes
* Added SimpleShader which shades using facing ratio
* Modified IDShader to be based on instance ID only, and to use facing ratio for better shading
* Added -quick_id option on the command line to override using IDShader
* Slight simplification of KDTree traversal
* Added ParameterList class to store arbitrary name/value pairs
* AccelerationStructure's are now built on demand for each geometry
* Added verbosity control to the UI system. Accessible on the command line using "-v n".
* Modified Scene to use an InstanceList
* Converted Janino invocations to use the default system compiler
* Upgraded to Janino 2.5.0
* Modified Mesh class to implement the AggregateTraceable interface
* Added AggregateTraceable interface
* Implemented Instance/Traceable combination
* Added checks for black diffuse/specular components
* Added PerlinVector which produce vector valued noise
* Renamed ImprovedNoise to PerlinScalar and added renderman-like calls

v0.06.4
* Upgraded to Janino 2.4.7
* Regenerated golden benchmark files
* Implemented BanchoffSurface primitive (from RJii's submission)
* Implemented Torus primitive (from RJii's submission)
* Added robust quadratic and quartic solvers
* Improved uv calculations on Sphere
* Added Matrix parsing to SCParser
* Rewrote Sphere to use a Matrix4 transformation instead of center/radius positioning
* Added getCorner() to BoundingBox
* Added Matrix4 class
* Upgraded to Janino 2.4.6
* Minor tweaks to the benchmark mode
* Upgraded to Janino 2.4.5
* Improved the built-in benchmark mode
* Minor optimizations
* Optimized the traversal for KDTree and BoudingIntervalHierarchy a little
* Upgraded to Janino 2.4.4
* Initial implementation of the Bounding Interval Hierarchy paper
* Small fix to TexturedWard and TexturedPhong shaders (null check)
* Created UberShader with individual diffuse and reflection components

v0.06.3
* Moved texture search path functionality out of TextureCache and into SunflowAPI
* Fixed missing text in progress bar during KDTree build in the GUI
* Leave \ in paths when opening files in the GUI. This avoids problems with windows network paths.
* Fixed quantization issues in the SRGB conversions
* Deprecated "glossy-samples" and "light-samples" settings
* Each light and each glossy shader now accepts their own number of samples in the scene file
* ward and phong shader types now parse an optional argument: samples which sets the number of glossy rays
* Added TexturedWardShader (texture applies to diffuse component)
* Added TexturedPhongShader (texture applies to diffuse component)
* Disable computation of glossy reflections if samples are set to 0 (even for secondary bounces)
* Moved diffuse and specularPhong light integration into ShadingState for easy re-use
* Minor optimization to light iterator
* Changed all lights to be parsed as a color/intensity so that color LUTs may assume [0,1] components
* Added a mechanism options for specifying color space in .sc files
* Non HDR images are now automatically converted into linear space by the application of an inverse SRGB LUT
* Added sRGB curves to Color class
* Removed all gamma correction code
* Moved getNextColor/Point/Vector out of Parser and into SCParser
* Fixed fresnel calculations in GlassShader
* Added ambocc gi engine
* Fixed cube grid inside/outside classification for ray coming from outside the surface
* Fixed basis inversion in all shaders - added facefoward method to ShadingState
* Fixed javadoc comments that refered to outdated methods
* Added javadoc comments to SunflowAPI
* Fixed use of deprecated constructor for scanner
* Upgraded to Janino 2.4.3
* Fixed bug in UniformGrid which could lead to missing cells

v0.06.2
* Fixed timing issue with tiling windows on startup
* Added -resoluton w h command line option
* Maximize if resolution is not sufficient
* Added includepath support
* Added include search path support
* Added SearchPath class to abstract search path functionality
* Fixed missing basis vector for non-textured triangles
* Added quick_ambocc command line option
* Default for exr output is now float/zip
* Changed sphere intersection to >=

v0.06.1
* Public release

v0.06.0
* Removed -kd command line option
* Made KDTree3 into KDTree and KDTree into KDTreeOld - the new algorithm is stable enough to be the default
* Upgraded to Janino 2.4.2
* Fixed texture search path caching and added option to add texture search paths in the scene file
* Upgraded to Janino 2.4.1
* Optimizations to KDTree3 leading to reduced memory usage
* Added version number into FastDisplay title bar
* Removed KDTree2
* Increased resolution limit for uniform grids to 256
* Allow meshes to be built without triangle indices - for meshes which just contain raw triangles
* New KDTree algorithm based on KDTree2 - produces the same trees about 2x faster
* New KDTree algorithm implemented as KDTree2 - produces better trees
* Removed all serialVersionUID's
* Moved Render and IPR buttons into image panel
* -buildonly now exits with error code 0
* Allow gamma correction on the command line for all display types
* Seperated gamma correction from toRGB() method
* Merged IrradianceCache classes together
* Added parameter to getIrradiance() to take into account the diffuse reflectance of the surface. Allows for importance tracking and other optimizations
* Instant GI method introduced (with bias correction options)
* Photon maps can classify the types of bounces they wish to allow
* Photon tracing takes place per-map
* Multi-threaded IPR
* Changed sigma table to be 128 pixels wide
* Added -nogi command line option
* Added generalized PhotonStore interface
* Fixed photon distribution bug in CornellBox primitive
* Changed UI.print* methods to use printf formatting and refactored all print* calls
* Created seperate method to load caustic samples into light sample list
* Removed interpolation of normals from BucketRenderer
* Require all light shaders to trace shadow rays themselves - allows for selective shadow tracing
* Modified LightSample to store only a shadow ray and diffuse/specular contributions
* LightSample iteration in shaders now makes use of the extended for loop syntax
* Light server doesn't warn about disabling photon mapping if photon mapping was not enabled
* SCParser adds the directory of the scene being loaded to search paths
* Added texture search paths
* Changed most output statements to use String.format for number display
* Replaced single trace depth with individual settings for diffuse, reflection and refraction depths
* Fixed IBL to use shorter shadow rays so it won't self shadow
* traceShadow returns a colored opacity
* Added Color.blend with the blend factor as a Color
* Removed adaptive shadow testing for area lights (not a huge win for transparent shadows)
* Removed special case for intersection with shadow rays
* Added -gamma option to the command line
* Extra info about the scene bounding box is displayed before rendering begins
* Added IDShader which uses a constant color per primitive
* Fixed incorrect handling of specular/glossy rays behind diffuse bounces
* Added TextureShinyDiffuseShader and corresponding parser construct
* Gamma correction menu in GUI
* Removed epsilon for SmallTriangle intersection test
* Only displays which need to be synchronized are. Most can be safely written to by multiple threads
* FastDisplay updates the BufferedImage all at once on imageEnd
* Added BucketThread into BucketRenderer instead of abstract class
* Removed an extra level of function calls from bucket based renderers
* Moved CamParser into RA2Parser
* Added Color constructor for greyscale colors
* Optimized FakeGI to not use Math.acos
* More SCParser cleanups
* Fixed bug in adaptive AA for background sampling
* Added option to view adaptive AA sampling in BucketRenderer
* New parameter to KDTree generation: SMALL_PROBABILITY which indicates when to cull nodes of very small size. 1e-6 seems to be a good default
* Default leaf size is now 0 to allow potential empty space cutoff in leaves
* Fixed serious bug in KDTree generation
* Option to dump KDTree as an obj
* Renamed -norender command line option to -buildonly 
* Fixed small bug in uv setting method
* More SCParser cleanup
* Fixed handling of /* */ for peekNextToken
* Upgraded to Janino 2.4.0
* Moved Bucket and Progressive renderers into their own package
* Removed TriangleMesh, Mesh now has enough functionality that this is no longer needed
* Timer displays ms if the measured time is below 10 seconds
* Added RA2Parser and CameraParser for RTCore comparison benchmarks
* Broke up SCParser into several methods
* Added peekNextToken function to parser
* Added C style block comment handling to parser
* Added an irradiance cache which works without photons
* Removed old GUI
* Added Janino detection to GUI
* Removed texture messages from parser
* Simpler KDTree traversal algorithm
* KDTree stores nodes in breadth first order (children are always next to each other)
* KDTree now builds compressed tree directly
* Created IntArray utility class for fast growable arrays of integers
* Removed KDTreeOld and KDTreeHavran
* Precompute AA base threshold
* Removed unecessary calls to Color.copy() and Color.black()
* Added an init message to QMC precomputation
* Halved the size of the QMC tables
* Removed stack allocation on each intersect by re-using scratch space inside IntersectionState
* Split RenderState into IntersectionState and ShadingState
* Fixed a small bug in the photon emission code for triangle lights. Thanks to lynx for pointing it out.
* Renamed SunflowGUI3 to SunflowGUI
* Renamed SunflowGUI to SunflowGUIOld
* Moved command line operation into new GUI
* Switched to JDesktopPane style for GUI
* Fixed canceled task exit for photon tracing
* Fixed cancel task logic
* Created SunflowGUI3 - script based UI
* Removed unused IrradianceCache from core package
* Removed unused methods from Ray
* Removed special handling for incorrect smooth normals from light sampling code
* IntersectonAccelerators are built from an ArrayList to avoid allocating an extra array if it isn't needed
* Filters have size only, not width and height
* Removed procedural demos from root package
* Added -norender flag for scripts which call render() themselves
* FrameDisplay won't open a window larger than the current resolution
* Enhanced image panel is now shared by SunflowGUI and standalone FrameDisplay
* Zoom image using mouse-wheel
* Added String based methods in SunflowAPI for built-in types
* Fit image using Ctrl+middle mouse button
* Reset image using middle mouse button
* Reset/Fit image menu options
* Dim image by modifying colors to 50% instead of clearing alternate scanlines
* Pan/Zoom rendered image in the GUI using left/right mouse buttons
* Procedural scene creation - run with a java file which implements a build method
* Flag to avoid rebuild acceleration structure if no geometry changed

v0.05.5
* Added customizable leaf size in kdtree builder (-kd n on command line)
* Added SmallTriangle to reduce memory usage when loading really large meshes (-smallmesh at the command line)
* Basic bump and normal mapping support
* Tangent space computation on meshes that have valid uvs
* Background color support
* Added texture support to amb-occ2 shader type in the parser
* Support for multiple shaders per mesh
* Removed gamma correction
* Renamed KDTree to be the most recent code. Old code is accesible as: KDTreeOld (-accel kdtree_old on the command line)
* Renamed [BSP] to [KDT]
* Minor speedups and reduce mem-usage in UniformGrid
* Optimized build process for KDTree
* Switched to enhanced for loop where appropriate
* Minor tweaks to kdtree builder

v0.05.4
* Removed Memory.sizeof for Object[]. This was printing the wrong information on 64bit systems.
* Bitmap constructor now throws its exceptions instead of silently catching them
* Added support for picking the channel type for OpenEXR files
* Added support for picking the compression type for OpenEXR files
* Removed unused snippets from OpenEXR code
* Refactored OpenEXR code to make it fit inside one Display class
* Added OpenEXR display driver (submitted by RJii)
* The Display interface now expects its image data to have (0, 0) be the top-left corner
* Added ImprovedNoise code from Ken Perlin
* Proof of concept janino shader support allows arbitrary shaders to be created on the fly
* Parser supports grabbing code blocks
* Fixed a bug in photon shader override process
* Shader table is now stored by the API instead of the parser
* Removed colormap support from TGA loader
* Added -lopri and -hipri command line settings for thread priority
* Added thread priority option
* Added -accel command line option
* Optimization to the bounding box test in each accel struct
* Improved the robustness of the KDTree intersection

v0.05.3
* Added some basic documentation to the README
* Minor quantization tweaks
* Can save any type of bitmap from framedisplay's or the gui (PNG or TGA)
* Added proper command line handling to SunflowGUI. Run with -h to see a list of options
* Added option to control the number of rendering threads (used for bucket processing and photon tracing)
* Moved intersection acceleration and primitive storage into Scene to unclutter LightServer
* Split primitives into regular and bounded primitives to avoid having to seperate the two in each intersection accel
* Don't allocate any memory for empty cells in UniformGrid
* Protected GridPhotonMap with a read/write lock
* Protected IrradianceCache with a read/write lock
* Added "Save Image" to the GUI to save rendered frames
* Basic drag and drop support for scene files into SunflowGUI (submitted by RJii)
* TGA read/write support. Reading support is not complete, but should handle the most common file types (submitted by RJii)

v0.05.2
* Include keyword for scene files. Allows seperating large meshes from the scene.
* Parser supports grouping tokens together by using quotes. This allows filenames with spaces.
* Parser supports comments starting in the middle of a line (after keywords for example)
* Removed point set surfaces
* Introduce Mesh and MeshLight and got rid of Triangle/Triangle light and Vertex classes
* Default glossy samples is now 4
* Phong shader has customizable number of rays
* Fixed sampling of adaptive lights through diffuse bounces. This improves path tracing performance.

v0.05.1
* Public release

v0.05.0
* Added ConstantShader
* Added a path tracing gi engine
* Bug fixes to parser around deprecated statements
* More error checking before photon tracing
* Added helper methods to Parser for colors, points and vectors
* Better error checking in SceneParser
* Introduced GiEngine class as a way to abstract the global illumination engine
* Split parser out of SunflowAPI into SceneParser
* Split non-image methods out of Display and into UserInterface
* Multi-threaded photon tracing
* deprecated options are now flagged as such by the parser
* shader override feature
* refactored photonmap package + new photon emission style
* fixed potential bug in PhotonMap when rendering with multiple threads
* synchronized TextureCache
* imagePrepare method in Display
* Javadoc Ant build file
* Lights are now responsible for generating their own sampling pattern
* Moved ConsoleDisplay into org.sunflow.core.display
* Moved Display interface into the core package
* Progressive rendering mode
* Method in display drivers to fill area with a flat color
* Programmable bucket ordering
* Added KDTree intersection accelerator
* Added TriangleFilter
* Added BlackmanHarrisFilter
* Added SincFilter
* Added LanczosFilter
* Added filter keyword to scene format
* Made the sigma sampling table as large as the maximum resolution (16k)
* Moved the case for light facing away from geometric normal into the light server
* Inverted bucket order so first bucket start in the upper left corner of the image
* Adaptive sampling for light sources (experimental - disabled for now)
* Console display can now show preview window if no filename is given
* Moved to Java 5, made all appropriate containers parameterized
* Fix for percentage display on large tasks in ConsoleDisplay
* Added low memory FlatTriangle for large triangle meshes
* Moved .sc file parser into api
* Removed RenderOptions class, merged all settings into light server
* Improved DOF lens sampling - concentric map disk sampling
* Moved TriMesh code into core, native support for large triangle meshes
* Computation of tangent vectors for spheres
* Added storage for a surface orthonormal basis inside RenderState
* Implemented Ward BRDF shader
* GUI now dims the previous image when re-rendering an image of the same resolution
* Synchronized writes of tile regions to Display
* Added preview of tile region before rendering the tile
* Added SphericalCamera to parser
* Added ShinyDiffuseShader, a combination of diffuse and perfect mirror shader
* Precomputed exponents for RGBE decompression
* Corrected flipping of HDR images on load
* Added options to lock samples inside IBL
* Moved shadow computations outside the shader, this simplifies the shader API a little
* Changed LightSample to use a linked list
* Switched QMC computations back to doubles as well as all sampling operations
* Added optimized calculation of base 2 halton points
* Added other radical inversion methods to QMC class
* ImageBasedLight: improved sampling using the histogram technique presented on the PBRT webpage
* Fixed internal reflection issue on glass shader
* ImageBasedLight: infinite sphere surrounding scene which can be mapped with angular probes or lon/lat environment maps
* .hdr image loading
* Added option for picking intersection accelerator in api and in .sc file format
* Fix to irradiance caching when number of samples is 0 (cache disabled)
* Cornell box primitive
* RainbowTest for motion blur
* Moving camera
* Thinlens camera
* Depth of field and motion blur super sampling
* Added Re-open option to GUI to quickly reload the same scene for tweaking
* Fix to final gather QMC - was missing instance number
* Fix to BVH for infinite extent geometry
* Removed path tracing shader and traceDiffuse call in LightServer
* Image filtering with programable filters
* Made main bucket rendering multi-threaded
* Made light samples a parameter of each individual light
* Added gamma correction option in GUI
* Fixed thread synchronization issue with cancel dialog in GUI
* Moved shader methods into RenderState
* Changed Shader an interface for easier integration with third party software
* Timer class for better time display in statistics
* ProgressDisplay class renamed to Display
* Display driver interface - Scene no longer stores output bitmap
* Hilbert tile scan order
* Arbitrary image resolution (not rounded to step sizes)
* Custom tile sizes and bug fixes to tile-rendering
* SunflowAPI frontend for scene creation
* Spherical camera shader
* Menger sponge example using cube grid
* Added cube grid primitive
* Large mesh rendering example
* Added maximum distance option for ambient occlusion computation

v0.04.0
* Fixed light server info display when using photon grids
* Bug fix in Vector3.encode
* Rewrote UniformGrid accelerator
* Switch from double to float throughout the code to save memory
* Faster ray/triangle intersection
* Experimental point cloud tracing
* BVH acceleration structure

v0.03.0
* Experimental photon grid algorithm
* Path tracing shader
* Glossy phong shader
* Fully deterministic rendering (no more calls to Math.random()) - removed unused QMC sequence code
* Ambient occlusion shader
* Adaptive over and under sampling

v0.02.2
* Added scene format description to README
* Changed Color class to use doubles instead of floats
* Moved light sampling book-keeping into RenderState instead of LightServer
* Seperated out PhotonMap class into GlobalPhotonMap and CausticPhotonMap
* Reduced memory usage in global photon map after irradiance computation
* Reduced memory usage in Bitmap class
* Fixed variance calculation on adaptive AA
* Added madd (multiply and add) operator to Color class
* Irradiance Gradients
* Changed QMC sequence interface to include multi-dimensional sequences.

v0.02.1
* Initial public release