DIVERSE Lance Arsenault John Kelso Center for Visualization and Virtual Environments Virginia Tech, Blacksburg, VA

Outline flashy demos15 overview: goals, description, design45 participatory demos, code revealed!60 do some programming60

flashy demos

overview DIVERSE: Device Independent Virtual Environments Reconfigurable Scalable Extensible

overview: goals free/open source modular flexible extensible

overview: goals works by default stay out of the user’s way augments instead of replaces easy to use, reconfigure, extend

overview: description C++ API SGI IRIX and GNU/Linux –supports all 3 IRIX binary types

overview: design DTK- DIVERSE ToolKit dgiPf- DIVERSE interface to Performer

overview: design: DTK server library client

overview: design: DTK remote shared memory hardware services DSOs

overview: design: dgiPf uses Performer, DTK generic input interface reconfigure without recompiling using –environment variables –DSOs –tweak files

overview: design: dgiPf structures Performer classes provides scenegraph symmetric/asymmetric frusta stereo new pfNode types

overview: design: dgiPf:classes dgiPf dgiPfAugment dgiPfDisplay dgiPfInput

overview: design: dgiPf:classes dgiPf –single instance –entry point into system –factory of other objects –loads DSO dgiPfAugment objects

overview: design: dgiPf:classes dgiPfAugment –adds functionality without program modification –four entry points- return value tells dgiPf how to proceed: prePfConfig postPfConfig prePfApp postPfApp

overview: design: dgiPf:classes dgiPfDisplay –single instance –sets up scenegraph –DIVERSE to world coordinates, meters –creates and updates frusta, stereo parallax and viewpoint –creates and manages dgiPfPipe objects

overview: design: dgiPf:scenegraph

overview: design: dgiPf:coordinates

dgiPfDisplay nested structure dgiPfDisplay –dgiPfPipe dgiPfWin –dgiPfScreen »pfChannal

overview: design: dgiPf:classes dgiPfPipe –one instance per pfPipe –each object creates and manages dgiPfPwin objects

overview: design: dgiPf:classes dgiPfPwin –one instance per pfPipeWindow –each object creates and manages dgiPfScreen objects –stereo or mono

overview: design: dgiPf:classes dgiPfScreen –each object creates and manages pfChannels one per screen if mono window two if stereo window –symmetric or asymmetric viewing frustum

overview: design: dgiPf:classes dgiPfScreen –symmetric frustum fixed size base moves with user’s view and position typically desktop or non-immersive specified by Performer fov and aspect

overview: design: dgiPf:classes dgiPfScreen –asymmetric frustum base is at a fixed position shape changes with view typically head-tracked or immersive specified by a center, height, width and hpr

overview: design: dgiPf:classes VT CAVE configuration: 3 pipes 3 windows 5 screens 9 channels

overview: design: dgiPf:classes dgiPfRecord –used by input –single instance –circular queue –each item an event record –all input devices in each event record

overview: design: dgiPf:classes dgiPfInput –client of dgiPfRecord –generic devices –polled or queued –local or remote –actual or virtual –devices identified by segment name

overview: design: dgiPf:classes dgiPfInput –generic devices locator valuator button keyboard

overview: design: dgiPf:classes dgiPfInput –polled or queued- application can specify polled –reads data asynchronously –typical example: tracker, valuator queued –circular –typical example: keyboard, button

overview: design: dgiPf:classes dgiPfInput –local or remote application unaware of source –actual or virtual data from hardware or calculations

overview: design: dgiPf:classes dgiPfInput –identified by segment name ex: head –any segment name can map to any device –new segments can be created as needed

overview: design: dgiPf: dgiPf-config installation information current defaults portable code better Makefiles

overview: design: dgiPf: DSOs separately compiled dgiPfAugment objects specify which to use at runtime cumulative effect general- can insert any code uses DSOs for display, input, dynamics

overview: design: dgiPf: DSOs display DSOs unloaded after dgiPfPostConfig “base” or “modifier”

overview: design: dgiPf: DSOs base display DSOs number and attributes of dgiPfDisplay, dgiPfPipe, dgiPfPwin, dgiPfScreen objects examples –simpleDisplay –vtCaveDisplay –wallDisplay –hyperDisplay

overview: design: dgiPf: DSOs modifier display DSOs modifies attributes of objects described by base display DSO examples –stereoDisplayMod –monoDisplayMod –queryDisplayMod

overview: design: dgiPf: DSOs input DSOs not unloaded called each frame provide queued and polled input data

overview: design: dgiPf: DSOs input DSOs real or virtual devices navigators examples –keyboardInput –caveSimInput –pfTrackballNav –wandJoystickNav

overview: design: dgiPf: tweakfiles global configuration changes text-editable default path and files like “.ini” files: [section name] key = value

real soon now... dgiGl –augments OpenGL –support for more platforms hooks to other tools, packages –VRPN, VTK, VRCO trackd

real soon now... device support –Intersense tracker –Phantom haptic –MOOG motion base

real soon now... immersive emulators –persona apps –diversifly interaction tools –menus, buttons, sliders, etc. –based on flkt

real soon now... Xwand –Mouse emulation by wand or other immersive input device head’s up displays “collaborative” methods –awareness tools

participatory demos, code revealed!

do some programming dgipf-config is your friend try: dgiPf-config dgiPf-config --about dgiPf-config --env dgiPf-config --dso-files dgiPf-config --dso-dir

do some programming application development cycle: edit (vi, emacs, nedit) ……. hello.C compile…………………... make run ………………………... hello

do some programming example programs in directories below: share/dgiPf/examples under directory given by: dgiPf-config --root

do some programming Programmer’s Guide in: html/dgiPf/dgiPf_Prog_Guide.html under directory given by: dgiPf-config --root or online at: “man” pages are also installed

do some programming repeat with a different DSO: setenv DSO_FILES hyperDisplay:caveSimInput hello -or- set d = `dgiPf-config --default-dso-files` # note- back-quote! setenv DSO_FILES $d:caveSimInput hello

do some programming DSO: edit and “make” generic.C to run from the generic directory: setenv DSO_FILES simpleDisplay:generic../hello/hello

do some programming DSO: to run from the helloWorld directory: set p = `dgiPf-config --default-dso-path` setenv DSO_PATH $PWD:$p cd../helloWorld hello

do some programming tweak file: edit ~/.dgiPfrc [dgiPfPwin] fov=30 then rerun any program