Published on February 11, 2014
Salt Shobun Baile and Brett Renfer Salt Project Proposal - Shobun Baile + Brett Renfer 1 !
Salt Salt is a physical, digital, and sonic sculpture that is gradually destroyed by direct and indirect human interaction, with the goal of making global-scale ecological concerns compelling and accessible to a wide audience. The sculpture is centered around a single salt object that slowly dissolves at a rate controlled by the physical presence of visitors at the installation, as well as virtual inﬂuences coming from a range of data harvested from online activity. ! Video will be directly mapped onto the salt object and will be accompanied by multi-channel audio output. The video and audio elements will degrade as a direct result of the salt dissolving, creating a visceral connection between the physical and the digital. Salt Project Proposal - Shobun Baile + Brett Renfer 2 !
System: Overview Water output 2: virtual input Water output 1: physical input Salt block Pedestal Salt Project Proposal - Shobun Baile + Brett Renfer 3 !
System: Water Output The water armature is comprised of 8 individually controllable outputs driven by peristaltic pumps. Salt Project Proposal - Shobun Baile + Brett Renfer 4 !
System: Depth camera cone The water armature is designed to allow an unobstructed view from a PrimeSense-type depth camera Salt Project Proposal - Shobun Baile + Brett Renfer 5 !
System: Projector locations Projector frustums based on Optoma TH1060P Salt Project Proposal - Shobun Baile + Brett Renfer 6 !
System: Software Architecture Local Input: Camera Sensing • Multi- or single-camera input (space dependent) to computer vision algorithms • Outputs location, motion data of on-site audience • Based off of TSPS* Remote Input: Web Activity • Aggregates Google API activity • Social: Google+, YouTube • Personal: Drive, Calendar, custom Chrome extension(s) for BR + SB • Outputs activity levels of each individual input Routing, Sensing, and Display • Digests incoming data from Local and Remote inputs, maps to Water and Sound Outputs • Renders projected imagery based on depth camera input • openFrameworks-based Audio Routing • Multi-channel routing software processes input from Routing application, outputs real-time processed audio • Ableton Live To projection, Arduino To sound output *TSPS: open-source computer vision toolkit developed + maintained by Brett Salt Project Proposal - Shobun Baile + Brett Renfer 7 !
System: Hardware Web Camera Camera Client* Projection Speakers (x4)** Depth camera Mac Pro Peristaltic Pump (x8) Arduino *Camera Client: Mac Mini, possibly Raspberry Pi (depending on prototyping results) ** Speakers: May require additional mixing hardware depending on Mac Pro sound card Salt Project Proposal - Shobun Baile + Brett Renfer 8 !
Proposed Timeline Phase 1: Prototyping • Material studies: test appropriate makeup of salt-based sculpture for optimum dissolution durations • Technical studies: • Reﬁne projector-depth camera calibration and live projection mapping • Test proposed water armature: distance, spread, number of pumps ! Phase 2: Content Creation • Visual: produce ﬁlm-based content for projection • Sonic: develop process-based sound degradation • Software development: produce input + output applications ! Phase 3: Installation Phase 4: Expansion • Further explorations of platform • Outreach: workshops, talks, open-source tools Salt Project Proposal - Shobun Baile + Brett Renfer 9 !
Process Current/ongoing prototypes Salt Project Proposal - Shobun Baile + Brett Renfer 1 !0
Prototype: Water Test 1 Prototype: Live Projection Mapping Camera-controlled pressurized solenoid Experiments with projector to depth camera calibration and layered video Salt Project Proposal - Shobun Baile + Brett Renfer 1 !1
Prototype: System Test 1 Camera sensing, peristaltic pump, salt sculpture, calibrated projector/depth camera, test video content Salt Project Proposal - Shobun Baile + Brett Renfer 1 !2
Prototype: System Test 1 (con’t) Sequence of salt sculpture dissolution Salt Project Proposal - Shobun Baile + Brett Renfer 1 !3
Thank you Salt Project Proposal - Shobun Baile + Brett Renfer 1 !4
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