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Volume Rendering

Volume Rendering. A volume representation is an extension of a 2D image to 3D space. A pixel in 2D space become a voxel in 3D space. Voxel. Volume Graphics Applications. Medical biology (confocal microscopy) geology (seismic measurements) molecular systems (electronic density maps)

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Volume Rendering

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  1. Volume Rendering A volume representation is an extension of a 2D image to 3D space. A pixel in 2D space become a voxel in 3D space. Voxel

  2. Volume Graphics Applications • Medical • biology (confocal microscopy) • geology (seismic measurements) • molecular systems (electronic density maps) • meteorology (weather prediction simulations) • chemistry (new material simulations) industry (non-destructive inspections)

  3. Volume Graphics Applications • Medical • Professional viewing the MRI data looks at a sequence of 2D images, or "slices", created of the subject. • A group of these slices could be considered as one 3D dataset • MRI images are slices 38 and 54 from 109 slices of size 256x256 taken of a human head

  4. Volume Graphics Applications • Medical • After Putting all the slices together. • Adding light and shading • Final Image

  5. Virtual Lights to Enhance Perception • Objects are rendered with shading from "virtual" lights • The intensity and color of voxels used to create the final image • The voxel intensity are used to estimated normals

  6. Rendering Volumes • 3D datasets could be converted to polygonal representations of one certain feature (surface). • Unfortunately this method allows the user to view only one feature (surface). • Volume rendering allows the user to see inside objects so the relationships among multiple features can be examined.

  7. Volume Graphics Applications • It is quite hard to represent semi-transparent objects such as amorphous clouds, smoke, fire, even jello using polygons. • How to mix Polygonswith volume ???

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