Archive

Archive for June, 2009

Creating Gray-Code sequences using gimp

June 15th, 2009 admin No comments

I needed to implement gray-code sequences for a fringe projection system i'm trying to build. To avoid hard to understand and not really intuitive C-code, i used gimp to produce the projection images. In this article i'm going to document the code used.

First is the script-fu function to generate a picture with a given number of fringes or - alternatively - a given width of the period:

PLAIN TEXT
CODE:
  1. (define (script-fu-oan-create-fringes fwidth t fcount)
  2. (let*
  3.     (
  4.     (myimg (aref (cadr (gimp-image-list)) 0))
  5.     (mylayer (gimp-image-active-drawable myimg))
  6.     (layers (gimp-image-get-layers  myimg))
  7.     (channels (gimp-image-get-channels myimg))
  8.     (height (car (gimp-drawable-height (car mylayer))))
  9.     )
  10.     (if (= t TRUE) (set! fwidth (/ (car (gimp-drawable-width (car mylayer))) (* anzahl 2)))
  11.                     (set! fcount (/ (car (gimp-drawable-width (car mylayer))) (* breite 2)))
  12.     )
  13.     (define i 0)
  14.     (gimp-selection-all myimg)
  15.     (gimp-edit-clear (car mylayer))
  16.     (gimp-selection-none myimg)
  17.     (while
  18.         (<i fcount)
  19.         (gimp-rect-select myimg (* (* fwidth i) 2) 0 fwidth height CHANNEL-OP-ADD FALSE 0)
  20.         (set! i (+ i 1))
  21.     )
  22.     (gimp-edit-bucket-fill (car mylayer) FG-BUCKET-FILL NORMAL-MODE 100 0 FALSE 0 0)
  23. )
  24. )

Then there is the register-function call to enable the menu item for the function:

PLAIN TEXT
CODE:
  1. (script-fu-register
  2. "script-fu-oan-create-fringes"                              ;func name
  3. "Create Fringes"                                            ;menu label
  4. "Create an image of fringes\
  5.  "                                                          ;description
  6. "Omar Abo-Namous"                                           ;author
  7. "copyright 2009, Omar Abo-Namous"                           ;copyright notice
  8. "March 02, 2009"                                            ;date created
  9. ""                                                          ;image type that the script works on
  10. SF-VALUE "Fringe width:" "16"                               ;
  11. SF-TOGGLE "Use Fringe count" FALSE                  ;
  12. SF-VALUE "Fringe count:" "8"                            ;
  13. )
  14. (script-fu-menu-register "script-fu-oan-create-fringes" "<Image>/Xtns")

An older in-depth script-fu article by me.

Categories: Programming, Science Tags: , ,

3DMagix: Just Blender renamed

June 11th, 2009 admin 3 comments

Apparently some silly guy is trying to make fast money by selling the open source and free 3D-software package Blender. He's using the name 3DMagix, which is a pretty dumb name. The site doesn't look to reassuring to me, but there are lots of people (some i am ashamed to call 'close relatives') who would gladly fall for this kind of 'best deal' offers. So, be warned: If you want to check out some nice and really(!) free 3d modelling, animation, texturing and video editing software (and yet some), head over to Blender.org and download it for free without having to register or give out your credit card number.. Thanks to Blendernation for the heads-up.

Here are some screen captures of the site (perhaps the creator wants to sue me?

Categories: software Tags: ,