AAOGlimpse Fun with OpenGL and FITS Keith Shortridge, Australian - - PowerPoint PPT Presentation

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aaoglimpse fun with opengl and fits
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AAOGlimpse Fun with OpenGL and FITS Keith Shortridge, Australian - - PowerPoint PPT Presentation

Jan 24, 2024 108 likes •578 views

AAOGlimpse Fun with OpenGL and FITS Keith Shortridge, Australian Astronomical Observatory glVertex3f (x,y,z); AAOGlimpse is a FITS image display program with a small difference. Heres the basic idea.... glVertex3f (x,y,z); glVertex3f

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glVertex3f (x,y,z);

AAOGlimpse – Fun with OpenGL and FITS

Keith Shortridge, Australian Astronomical Observatory

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glVertex3f (x,y,z);

AAOGlimpse is a FITS image display program – with a small difference. Here’s the basic idea....

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glVertex3f (x,y,z);

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glVertex3f (x,y,z); glColor3f (r,g,b);

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glVertex3f (x,y,z);

Formal Definition of Functional Requirements

World Coordinate System (WCS) support Support for 3D data

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glVertex3f (x,y,z);

WCS

Uses Mark Calabretta’s wcslib Each data pixel has X,Y,Z WCS coordinates, and these are used to draw its surface in coordinate space. (Can use a lot of memory.) In OpenGL you draw the surfaces in the coordinate space you

  • choose. (You don’t have to think about the screen at all.)

Then how you view it is something completely separate.

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glVertex3f (x,y,z);

3D Data

Each plane of the data is its own 3D surface, and you have a lot of these 3D surfaces.

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glVertex3f (x,y,z);

More Functional Requirements

Analysis of optical test data – our optical engineers wanted to fit ellipses to out‐of‐focus test images.

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glVertex3f (x,y,z);

Optical Test Data Functional Requirements

Ellipse fitting ‐ Interactive and Automatic JPEG input

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Automatic fitting using ‘plug‐out’ utility programs.

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Interactive fitting using the cursor.

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glVertex3f (x,y,z);

A bit of fun with JPEGs

Read in using libjpeg. Surface height depends on sum of all R,G,B colour values. Surface colour is the R,G,B colour for each pixel.

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glVertex3f (x,y,z);

Current Status

Available for download as an OS X executable. http://www.aao.gov.au/local/www/ks/AAODisp.html (or Google AAOGlimpse) ~8200 system‐independent lines of C++ ~850 OS X dependent lines of Objective‐C++ (OS X user interface) Source will be made available (following a little housekeeping). Port to Linux or Windows should be straightforward – needs some effort.

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glVertex3f (x,y,z);

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AAOGlimpse – Fun with OpenGL and FITS

Keith Shortridge, Australian Astronomical Observatory

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AAOGlimpse is a FITS image display program – with a small difference. Here’s the basic idea....

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Formal Definition of Functional Requirements

World Coordinate System (WCS) support Support for 3D data

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WCS

Uses Mark Calabretta’s wcslib Each data pixel has X,Y,Z WCS coordinates, and these are used to draw its surface in coordinate space. (Can use a lot of memory.) In OpenGL you draw the surfaces in the coordinate space you

  • choose. (You don’t have to think about the screen at all.)

Then how you view it is something completely separate.

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3D Data

Each plane of the data is its own 3D surface, and you have a lot of these 3D surfaces.