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Ibrahim Demir
for Hydrological and Atmospheric Simulations
and Visualizations on the Web
GPGPU Applications
Big Data
We are collecting and generating data on a
petabyte scale (1Pb = 1,000 Tb = 1M Gb)
Data contains valuable information that can
drive insights and discoveries
It can be difficult to access, manage,
and generate knowledge and
decisions from this “big data”
JS x 100 - Multicore CPU/GPU
Big Data Analytics
Desktop-like Games
Scientific Visualization
Image / Video Processing
Augmented / Immersive Reality
NVIDIA Titan X – 5760 Cuda Cores
8 TFLOPs compute power
Web 3.0 and GPU
CPU-based Computations
JavaScript (parallel / multi-core)
SIMD.js
ASM.js
GPU-based Computations
WebCL
WebGL
Computing on the Web
Pure JavaScript
50-100x speed improvement
Parallel JavaScript
Web Workers / Multi-core CPU
Background Thread / window-less tab
Distributed volunteer computing applications on the client side
JavaScript
SIMD stands for Single Instruction Multiple Data, and for performing
operations on multiple data elements, in parallel.
SIMD.js is a new API being developed by Intel, Google, and Mozilla. One
of the uses of SIMD is to accelerate processing of large arrays of data.
SIMD.js will accelerate a wide range of demanding applications today,
including games, video and audio manipulation, scientific simulations, and
more, on the web.
SIMD.js
ASM.JS is a highly optimized subset of JS
designed to provide near-native application
performance in a browser, and well suited for
any computationally intensive task.
ASM.js
WebCL (Web Computing Language) is a JavaScript binding to OpenCL
for parallel computing within any compatible web browser without plug-ins.
WebCL allows web applications to actualize speed with multi-core CPUs
and GPUs; this intends to make computationally intensive programs feasible
in the browser, e.g. physics engines, canvas element and video editing.
WebCL is designed and maintained by the Khronos Group. The completed
specification for WebCL 1.0 was released on March 19, 2014.
WebCL
WebGL is a powerful part of the new HTML5 standard, bringing graphics
card capabilities directly to the browser.
To get WebGL to perform scientific calculations, simply trick GPU by
pretending that it is rendering graphics.
GPU executes Fragment Shader for every pixel of output image after
geometry rasterization to calculate resulting colors. For GPGPU
calculations, put your functions here, and calculate a new value of a
simulation cell represented by a texture pixel.
WebGL
GPGPU
The GPGPU is General Purpose computing on GPUs.
GPGPU operates by using graphics methods and primitives to
perform general purpose computations.
For example, textures are used as memory, while shaders are
programmed to be used as kernels, which are computed on each
graphics primitive.
What is GPGPU?
WATERSHED DELINEATION
40m grid cells – 90m res.
150mb terrain raster data
converted to
5mb custom image data
9 directions
WATERSHED DELINEATION
INSTANT
OFFLINE
Video
https://www.youtube.com/watch?v=lVMN76sdCrA
WATERSHED DELINEATION
WEBGL
SHADER
40m grid cells – 90m resolution
150mb terrain raster data
converted to
5mb custom image data
9 directions
Dynamic texture size
Data in multi color channels
Multi level processing in
each iteration
WATERSHED DELINEATION
WEBGL
SHADER
FLOOD VISUALIZER
• Reflections and refractions• Ambient occlusion• Height-field water simulation• Shadows
FLOOD VISUALIZER
IMMERSIVE
REALISTIC
Video
https://www.youtube.com/watch?v=vX8UNdM44_c
DYNAMIC DATA
HIGH-RESOLUTION
FLOW VISUALIZATION
DYNAMIC DATA
HIGH-RESOLUTION
FLOW VISUALIZATION
Video
https://www.youtube.com/watch?v=PWY4z-7hOuQ
Dynamic Objects
Static Objects
Levee/Dam
River System
GAME PHYSICS
VIRTUAL REALITY
Dynamic Objects
Static Objects
Levee/Dam
River System
GAME PHYSICS
VIRTUAL REALITY
Video
https://www.youtube.com/watch?v=DXrBkjr7nec
Webcam
Marker
Augmented Projection
AUGMENTED REALITY
MARKER DETECTION
Augmented Projection
Table
Marker
AUGMENTED REALITY
MARKER DETECTION
Augmented Projection
Table
Marker
AUGMENTED REALITY
MARKER DETECTION
Video
https://www.youtube.com/watch?v=eHgM_0rw1bY
Distorted Projection of Scene
IMMERSIVE REALITY
HEADS-UP DISPLAY
Distorted Projection of Scene
IMMERSIVE REALITY
HEADS-UP DISPLAY
Video
https://www.youtube.com/watch?v=tY9QaDHnyAU
Controls and Interaction
Motion Tracking
Gesture Tracking
Remote
Interaction GESTURE CONTROLS
MOTION TRACKING
Large Scale Geospatial
Data Visualization
FLOOD MAP FLIGHT SIMULATOR
3-DIMENSIONAL
REMOTE INTERACTION
FLOOD MAP FLIGHT SIMULATOR
3-D ENGAGING
REMOTE INTERACTION
Video
https://www.youtube.com/watch?v=6ZzLT_8U6fk
Rainfall Maps
550 hours (2200 steps) of data
RAINFALL & RIVER DRAINAGE
3D PERSPECTIVE VIEW
550 hours (2200 steps) of data
RAINFALL & RIVER DRAINAGE
3D PERSPECTIVE VIEW
Video
https://www.youtube.com/watch?v=FhmMAzyd7fI
RAINFALL PRODUCT DATA BROWSER
SPECIAL GRID
WEBGL + GPU
http://ifis.iowafloodcenter.org
Iowa Flood Information System
Thank you
Ibrahim Demir
ibrahim-demir @ uiowa.edu
http://myweb.uiowa.edu/demir/
Questions
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