BPC: Art and Computation – Fall 2006BPC: Art and Computation – Fall 2006

Digital media in virtual environments Digital media in virtual environments Part I - imagesPart I - images

Erik Brisson

ebrisson@bu.edu

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Digital Media in VRDigital Media in VR

Examples– images– sound clips– text– video streams– audio streams

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Images in virtual environmentsImages in virtual environments

C.G. concepts– geometric models– digital images– texture mapped images– producing c.g. images

Images in DAFFIE

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Computer graphics – texture mapsComputer graphics – texture maps

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Model geometry – cube on tabletopModel geometry – cube on tabletop

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Model geometry - torusModel geometry - torus

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What is a digital image?What is a digital image?

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What is a digital image?What is a digital image?

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What is a digital image?What is a digital image?

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What is a digital image?What is a digital image?

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Putting it together – texture mapsPutting it together – texture maps

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Images – aspect ratio Images – aspect ratio

Aspect ratio

= ratio of width

to heightExample

12 x 9 pixels

Aspect ratio

= 12 : 9 = 4 : 3 = 1.3333 : 1

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Aspect ratio exampleAspect ratio example

Size = 640 x 480 pixelsAspect ratio = 640 : 480 = 4 : 3

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Aspect ratio exampleAspect ratio example

Size = 512x512 pixelsAspect ratio = 512 : 512 = 1 : 1

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Aspect ratio exampleAspect ratio example

Size = 480x640 pixelsAspect ratio = 480 : 640 = 3 : 4

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Human view of physical worldHuman view of physical world

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Human view of imageHuman view of image

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Computer graphics paradigmComputer graphics paradigm

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C.G. concept - texture mapC.G. concept - texture map

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C.G. example - texture mapC.G. example - texture map

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Texture map fullTexture map full

++

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Result - texture mapped c.g. imageResult - texture mapped c.g. image

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Texture map alternativeTexture map alternative

++

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More texture map alternativesMore texture map alternatives

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Texture map general exampleTexture map general example

++

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Texture map cylinderTexture map cylinder

++

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Texture map cylinder approximationTexture map cylinder approximation

++

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What you will be able to doWhat you will be able to do

DAFFIE Project1 demo nowDAFFIE Project1 demo now

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DAFFIE modelsDAFFIE models

Models loaded when DAFFIE viewer starts– Includes geometry and texture images

Use imagecp tool to send your images into VR world– Choose Corel generated image on your PC– Choose object in the Project1 DAFFIE world– Send

What does this do?

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Imagecp and DAFFIEImagecp and DAFFIE

Navigator Viewer

Navigator

Viewer

Sound server

Event Server

imagecp

imagecp

imagecp

imagecp Image agent

Sound server