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- WHAT THE PRODUCT DOES
-
- XVision for windows allows the user to view volumetric datasets
- using "Direct Volume Rendering". Simply put, this gives the user
- XRay vision. He/She can see the surface, but can also see through
- the surface to the structures underneath.
-
- This (relatively new) type of graphics is used to view volume
- data such as that provided by Cat Scan (CT) Machines and Magnetic
- Resonance Imaging (MRI). It is also used to view structures at the
- cellular level and genetic levels using Fluorescent Microscopy and
- other technologies.
-
- The product is called a "Volumetric Ray Tracer" and requires
- that a simulation of the interaction of light with the semi-
- transparent volume data must be calculated. This is extremely
- computationally expensive. Every attempt (short of resorting
- to assembler for strategic modules) has been made to boost
- rendering speeds while keeping memory consumption to a minimum.
-
-
- HARDWARE REQUIREMENTS
-
- - A 486 or better processor (pentium preferred)
- - A Mouse
- - A Graphics card capable of better than 256 colors
- - Windows 3.1
- - 4 MB of memory (8 MB to render the CT dataset provided)
-
-
- TO INSTALL XVISION FOR WINDOWS
-
- 1) mkdir c:\xvision (or some other directory of your choice)
- 2) Use pkunzip to decompress the downloaded file. This
- utility can be found on compuserve.
- - copy xvision.zip c:\xvision
- - del xvision.zip
- - cd c:\xvision
- - Type "pkunzip xvision.zip"
- 3) Place all the uncompressed files into c:\xvision
- 4) Start Windows (if necessary)
- 5) Choose file->new from the program manager menu
- 6) Choose "program item" and press "OK"
- 7) Fill out the program item properties dialog box as follows:
-
- Description: Xvision for Windows
- Command Line: c:\xvision\xvision
- Working Directory: c:\xvision
- Shortcut Key: None
- Run Minimized: Leave Option Off
-
- 8) Press "OK"
-
-
- EXAMPLE PROGRAM INTERACTION
-
- 1) Double click on the "Xvision for Windows" icon to run the program.
- 2) Double click on the "mlti_clr.dat" file in the file selection box
- at the left.
- 3) Press some of the rotate keys at the bottom right to fly about the
- (currently empty) volumetric dataset.
- 4) Select "Define->volume" to allow viewing of the volumetric dataset.
- 5) Double click on the "multi_clr.dat" file again. The volume data
- will be displayed in the display window after a short pause.
- Now press "expand" to view the data at a large size. Note that
- as the size increases, so does rendering time.
-
-
- Notes:
-
- - The "Define->extents only" menu entry is on by default. The
- define->volume menu item allows viewing of the volumetric
- dataset. The "Extent Cues" menu defines whether the extents
- (i.e., edges) and the x/z axes are displayed in the viewing
- window.
-
- - One low-resolution non-artificial dataset has been included in the
- distribution. See the file "realdata.dat". This is a Cat Scan
- of a human head. With some practice, you should be able to
- effectively explore the data. I will download the same dataset
- at a higher resolution if someone wants it. It is 7MB large
- and viewing it requires 16 MB of memory.
-
- - The dive/surface buttons can be used to uniformly bias the transparency
- levels of the contents of the volume allowing the user to see data
- at different depth in the volume.
-
- - Use the "extents only" mode to find an appropriate viewing angle
- quickly. When you think you are at or close to an appropriate
- viewing angle, slip into volume mode for one frame to check it
- out. Keep the size (via the expand/shrink buttons) down until
- you have honed down on the appropriate opacity and viewing
- angle.
-
-
- KNOWN FEATURES/BUGS
-
- 1) Multitasking will not occur when the data files are loading (this
- will not be noticed when using the artificial datasets). The system
- may appear to lock up momentarily.
-
- 2) Slower processors (less than pentium) may cause windows to respond
- slowly to interface events while xvision is rendering large
- datasets.
-
- Please report bugs and suggest features by sending mail to the CIS ID
- on the datafile that you downloaded or to "INTERNET:rmorris@playmate.mv.com".
-
-