= Release Requirements =

== Mostly done.  May need cleaning up. ==

=== Graphics and tools ===
 - Atom/bond styles: sticks, bs, sphere, individually controllable
 - Show/hide controllable down to individual atoms, small units of other reps
 - Coloring controllable down to individual atoms, small units of other reps
 - Silhouettes
 - Adjustable background color
 - Interactive shadows
 - Lighting options - ambient occlusion, ambient-only, N-point
 - Supersampling
 - Volume isosurfaces
 - Depth cueing (want adjustable color, amount)
 - Set of built-in colors (as opposed to giving hex code or RGBs only)
 - Molecular surface and volume isosurface styles: solid, mesh


== Late summer release ==

 === Graphics and tools ===
 - Sessions (required because one needs to save state for any pub figure)
 - Ribbons
   - hides mainchain atoms, sidechain connects to ribbon nicely
 - Molecular surface
   - molecular surface categories* (I think the default should have a separate "main" for each chain ID)
   - easily hide smaller bits (like "surf visiblePatches N")
 - Smoothness control (vertex density, subdivision)
 - Balloon atomspec
 - Pseudobonds
    - metal complexation
    - distance monitor

 === User interface ===
 - Go up and down selection hierarchy
 - Save image dialog
 - Open file dialog
 - Save/restore sessions
 - Command history
 - Mouse modes
  - button strip
  - hot keys

 === Infrastructure ===
 - Nightly builds
 - Preferences
 - Triggers
 - Selections
 - Session files
   - molecular data
   - Maybe just implement a command history rather than a full session?
 - Distinction between public and private API


== December release ==

 === Presentation graphics ===
 - Transparency controllable down to individual atoms/bonds, small units of other reps
   - single-layer
 - Clipping
   - global hither/yon
   - capping of all solids: surfaces, ribbons, atoms/bonds, objects
   - per-model single-plane or slab
 - Selection highlight

 === CellPACK ===
 - Open cellPACK models, fetching JSON files from web
 - Open collada surface files used to represent cellPACK molecules
 - Hierarchical collapsible list of model components
  - checkbuttons for display, active, etc.
 - Mouse hover to pop-up name of molecular component

 === User interface ===
 - Simple !Selection/Action menus
  - Actions
   - Hide/show
   - Color
   - Surface
   - Style (atom only)
   - Delete
  - Selections
   - By model/chain
   - By structure (ions, ligand, secondary structure, etc.)
   - Operations (clear, invert all models, invert selected models, select all)
 - Rapid Access (file history in particular)
 - Hierarchical model panel
  - Active/shown checkboxes
  - Action buttons
 - Full side view (clipping planes)
 - Mouse selection

 === Infrastructure ===
 - Essential commands, make a list with command syntax
 - Command documentation
 - Full atomspecs


== Highly desirable ==

 === Graphics and tools ===
 - Smart molecule display
 - Transparency correctly rendered multiple-layer, multiple models
 - Color by atom/res attribute (e.g. hydrophobicity)*, geometry (e.g. radial), or volume data value (e.g. density, electrostatic potential)*
 - H-bonds*
 - Dashed and dotted pseudobonds (cylinders as well as lines)
 - Isosurface smoothing
 - Easily hide smaller surface components (like hide dust)
 - Geometric objects 
  - structure-derived (best-fit planes, axes, ellipsoids, etc.)*
  - arbitrary (3D arrows, planes to cast shadows upon, etc.)
 - Scenes (so that one doesn't have to have a session for each figure panel)
 - Background color gradient
 - Other sectioning (e.g. cut octant, spherical clipping, etc.)
 - 3D labels
 - 2D labels and arrows of adjustable color/size, interactive repositioning
 - Color key (specialized 2D annotation)

 === CellPACK ===
 - Geometric selection eg drag-select and select-within-shape

 === User interface ===
 - Actions
  - Style
   - ribbon
   - surface
  - Label
 - Selections
  - By residue type or category/atom element
  - By chemistry (functional groups, atom types, residue properties)
 - Appearance (transparency and material)
 - Export in different formats (PDB, volume format, graphics format, etc)
 - Improved toolshed interface

 === Infrastructure ===
 - Reliable operation on Linux
 - Application icon
 - API documentation

== Would be nice ==

 === Graphics and tools ===
 - Ribbons fully integrated with pipes and planks 
  - (alternative ways of "cartooning" the secondary structure elements)
 - Tubes (could be a sub-option of ribbons)
 - Continuous fade between residue ribbon segments instead of abrupt
 - Ring fill, aromaticity and bond multiplicity displays 
  - (e.g. two lines or two sticks for double bonds)
 - Option to show solvent-accessible vs. solvent-excluded, or both
 - Ways to control and smooth boundary of displayed patch, maybe drawing an outline with mouse or choosing individual triangles to hide?
  - Individual surface triangles?
 - Abstracted nucleotides
  - slabs, lollipops, ladder rungs
  - need better default than in Chimera1
 - Per-model silhouette
 - Custom silhouette
  - draw outline in 2D with mouse, regular geometric (e.g. circular) and maybe even free-form with smoothing?
  - other ways to emphasize area of interest within an outline 
   - making stuff outside it transparent, faded, or blurred
 - Some kind of shininess control and/or ability to use different material properties for different objects
 - "Smart" clipping (keeping objects whole, e.g. multiscale subunits not sliced even if plane goes through them)
 - Interactively adjustable light positions
 - Lighting contrast slider
 - Background images
 - Publication presets?  hard to decide because there are so many potentially useful combinations of styles and lighting
 - Clashes*
  - (find contacts also important for coloring interaction patches of surfaces*)
 
 === User interface ===
 - Stereo and orthographic camera modes
 - RFE / bug report dialogs
 - Chimera 1 -> 2 session conversion


== Eventually ==

 === Unsorted ===
 - Morphing, trajectory playback*
 - Animation commands (frame-argument)
 - Animation GUI (timeline)
 - Show multiple frames of a trajectory simultaneously
 - Windows app