These features must be present before 0.1 is released.

• Working Scene Description system
• Sphere and basic mesh handling
• Working direct lighting (reasonable quality, multiple light sources)
• Spectral handling
• HDR output of some kind (e.g. Radiance compatible)
• (desired) Texturing of diffuse components (i.e. colour mapping)
• Documentation on all implemented features
• Exporter for at least one major modelling application

These features must be present before 0.2 is released.

• 'Robustify' the Scene Description system, systematic error handling and recovery
• Initial bi-directional path tracing implementation
• Scene partitioning system to accelerate shadow and first-hit rays
• More powerful importance sampling for direct lighting (and other systems)
• Beginnings of physically based camera model

These features are desired in future releases.

• Network (and SMP) distributed rendering. This is actually a priority for me and will probably be in 0.3
• More sophisticated texturing abilities
• More primitive types (and more types that can be used as lights)
• Participating media rendering
• Volume rendering (where different to p-media)
• Ensure ports to other platforms work
• More exporters, work out best ways to integrate renderer into art pipeline (e.g. coverage rendering would be a simple addition)