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diff --git a/ds9/doc/ref/3d.html b/ds9/doc/ref/3d.html index 9ab0e53..2270f49 100644 --- a/ds9/doc/ref/3d.html +++ b/ds9/doc/ref/3d.html @@ -1,80 +1,77 @@ -<!DOCTYPE doctype PUBLIC "-//w3c//dtd html 4.0 transitional//en"> +<!DOCTYPE doctype PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> - <head> - <meta http-equiv="Content-Type" content="text/html; - charset=windows-1252"> - <meta name="GENERATOR" content="Mozilla/4.78 [en] (X11; U; Linux - 2.4.7-10 i686) [Netscape]"> - <title>3D</title> - </head> - <body vlink="#551a8b" text="#000000" link="#0000ee" bgcolor="#ffffff" - alink="#ff0000"> - <h3><img alt="" src="../sun.gif" width="100" height="98" - align="middle"> 3-D Frames<br> - </h3> - <blockquote> - <p>Previous versions of DS9 would allow users to load 3-D data - into the traditional 2-D frames, and would allow users to step - through successive z-dimension pixel slices of the data cube. To - visualize the 3-D data in DS9 v. 7.0, a new module, encompassed - by the new <tt>Frame 3D</tt> option, allows users to load and - view data cubes in multiple dimensions.<br> - </p> - <p>The new module implements a simple ray-trace algorithm. For - each pixel on the screen, a ray is projected back into the view - volume, based on the current viewing parameters, returning a - data value if the ray intersects the FITS data cube. To - determine the value returned, there are 2 methods available, - Maximum Intensity Projection (MIP) and Average Intensity - Projection (AIP). MIP returns the maximum value encountered, AIP - returns an average of all values encountered. At this point, - normal DS9 operations are applied, such as scaling, clipping and - applying a color map.<br> - </p> - <p>Rendering time is independent upon the actual data cube size. - Instead, the time it takes to render is based on how many rays - are needed to project the data cube upon the screen in the view - volume and the current zoom factor. The new module requires no - special hardware or graphical processor unit (GPU) and the - rendering time is adequate for interactive GUI manipulation on - most computers. The rendering engine is developed using the - POSIX thread library, allowing multiple light weight processes - to be spawned to complete an image in parallel. The number of - threads actually generated is a user specified parameter. Since - all modern hardware contain multiple CPU cores, the default - value is 8 threads. For larger work stations, this number can be - increase. For every doubling in the number of CPU cores - available, rendering times decrease approximately 75%.<br> - </p> - <blockquote><tt>Example:</tt><br> - <tt># create 3d frame, load fits file</tt><br> - <tt> # set view angle to az 45 el 30 deg</tt><br> - <tt> # set rendering method to Average Intensity Projection</tt><br> - <br> - <tt>% ds9 -3d mycube.fits </tt><tt>-3d vp 45 30 </tt><tt>-3d - method aip</tt><br> - <br> - <tt>% xpaset -p ds9 3d</tt><br> - <tt> % xpaset -p ds9 file mycube.fits</tt><br> - <tt> % xpaset -p ds9 3d vp 45 30</tt><br> - <tt> % xpaset -p ds9 3d method aip</tt></blockquote> - <blockquote> </blockquote> - All 2-D graphics, regions, cross hairs, contours, and coordinate - grids, are applied to the current slice, which is selected by the - user. When the user wishes to match or lock a 2-D image and to a - 3-D data cube, the current slice is used to determine the - rendering solution. The user can crop the data cube for all 3 axes - via the command line or the GUI. The new module also supports FITS - event files binned into a data cube.<br> - <br> - All printing support has been extended to the new 3-D module. The - user may generate 3-D images in Postscript, JPEG, TIFF, and other - formats, just as in the 2-D case. Furthermore, native printing is - supported for the Windows version.<br> - <br> - DS9 analysis macros have been enhanced to fully support the new - 3-D module, allowing the user to invoke external analysis tasks - based on the current view parameters and to return results back - into DS9 in the form of text, plot, 2-D image, or 3-D image. </blockquote> - </body> +<head> +<meta name="generator" content= +"HTML Tidy for Mac OS X (vers 31 October 2006 - Apple Inc. build 15.18.1), see www.w3.org"> +<meta http-equiv="Content-Type" content= +"text/html; charset=us-ascii"> +<meta name="GENERATOR" content= +"Mozilla/4.78 [en] (X11; U; Linux 2.4.7-10 i686) [Netscape]"> +<title>3D</title> +</head> +<body vlink="#551A8B" text="#000000" link="#0000EE" bgcolor= +"#FFFFFF" alink="#FF0000"> +<h3><img alt="" src="../sun.gif" width="100" height="98" align= +"middle"> 3-D Frames<br></h3> +<blockquote> +<p>Previous versions of DS9 would allow users to load 3-D data into +the traditional 2-D frames, and would allow users to step through +successive z-dimension pixel slices of the data cube. To visualize +the 3-D data in DS9 v. 7.0, a new module, encompassed by the new +<tt>Frame 3D</tt> option, allows users to load and view data cubes +in multiple dimensions.<br></p> +<p>The new module implements a simple ray-trace algorithm. For each +pixel on the screen, a ray is projected back into the view volume, +based on the current viewing parameters, returning a data value if +the ray intersects the FITS data cube. To determine the value +returned, there are 2 methods available, Maximum Intensity +Projection (MIP) and Average Intensity Projection (AIP). MIP +returns the maximum value encountered, AIP returns an average of +all values encountered. At this point, normal DS9 operations are +applied, such as scaling, clipping and applying a color +map.<br></p> +<p>Rendering time is independent upon the actual data cube size. +Instead, the time it takes to render is based on how many rays are +needed to project the data cube upon the screen in the view volume +and the current zoom factor. The new module requires no special +hardware or graphical processor unit (GPU) and the rendering time +is adequate for interactive GUI manipulation on most computers. The +rendering engine is developed using the POSIX thread library, +allowing multiple light weight processes to be spawned to complete +an image in parallel. The number of threads actually generated is a +user specified parameter. Since all modern hardware contain +multiple CPU cores, the default value is 8 threads. For larger work +stations, this number can be increase. For every doubling in the +number of CPU cores available, rendering times decrease +approximately 75%.<br></p> +<blockquote><tt>Example:</tt><br> +<tt># create 3d frame, load fits file</tt><br> +<tt># set view angle to az 45 el 30 deg</tt><br> +<tt># set rendering method to Average Intensity Projection</tt><br> +<br> +<tt>% ds9 -3d mycube.fits</tt> <tt>-3d vp 45 30</tt> <tt>-3d method +aip</tt><br> +<br> +<tt>% xpaset -p ds9 3d</tt><br> +<tt>% xpaset -p ds9 file mycube.fits</tt><br> +<tt>% xpaset -p ds9 3d vp 45 30</tt><br> +<tt>% xpaset -p ds9 3d method aip</tt></blockquote> +All 2-D graphics, regions, cross hairs, contours, and coordinate +grids, are applied to the current slice, which is selected by the +user. When the user wishes to match or lock a 2-D image and to a +3-D data cube, the current slice is used to determine the rendering +solution. The user can crop the data cube for all 3 axes via the +command line or the GUI. The new module also supports FITS event +files binned into a data cube.<br> +<br> +All printing support has been extended to the new 3-D module. The +user may generate 3-D images in Postscript, JPEG, TIFF, and other +formats, just as in the 2-D case. Furthermore, native printing is +supported for the Windows version.<br> +<br> +DS9 analysis macros have been enhanced to fully support the new 3-D +module, allowing the user to invoke external analysis tasks based +on the current view parameters and to return results back into DS9 +in the form of text, plot, 2-D image, or 3-D image.</blockquote> +</body> </html> |