Joaquin Casillas Melendez (jcasilla++at++glup.eleinf.uv.es)
Thu, 17 Jul 1997 13:11:03 +0200 (CEST)
> Hello:
>
> I am trying to map an image of a neon sign (created in Photoshop)
> with alpha onto a geometry. The image has the sign in the middle with neon
> like light emanating from it which slowly merges with the blackness around
> the sign. This image with its geometry is in an Inventor file which gets
> loaded into my application through pfiv (BTW : the version of pfiv that I have
> didn't have transparency enabled, so I added the lines :
>
> if ( numComponents == 4 )
> {
> cbd->dummyGState->setMode(PFSTATE_TRANSPARENCY, PFTR_ON);
5q> }
>
> in the routine 'getTexture').
>
> Anyway, the problem is that when this texture gets loaded, the neon light
> around the sign appears completely banded with each band having a single
> level of colour. The change in colour from the neon light colour to black
> (completely transparent) is not smooth at all. What else should I set to make
> it smooth?
>
> I have already tried recreating a fresh image of very large size and mapping
> that, but to no avail.
>
> I am using OpenGL, RE2, 5.3, pf 2.0.1. I do not have glxinfo to find out the
> visual that pf window might actually be using. Doesn't RE2 come with
> glxinfo? Is it possible to install it from somewhere?
>
> Thanks for any help.
>
> -anita
>
> kishore++at++triavest.com
>
> --
> Anita Kishore
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>
Hello Anita.
Try changing the transparency mode to PFTR_HIGH_QUALITY in order to get a
smoother change in the neon light colour. I also work with a Onyx RE2 and
had the same problem with transparency.
Respect to the glxinfo command, it is located in /usr/sbin/glxinfo
(almost, in the RE2 I used to work).
Hope this helps.
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
_/ Joaquin Casillas | email: jcasilla++at++glup.eleinf.uv.es _/
_/ ARTEC (LISITT) | _/
_/ Dept. Electr. & Informat. | Phone: +34 6 360 4484 Fax: +34 6 361 6198 _/
_/ University of Valencia | Address: Hugo de Moncada 4. 46010 Val.(SPAIN)_/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
=======================================================================
List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
Submissions: info-performer++at++sgi.com
Admin. requests: info-performer-request++at++sgi.com
This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:55:37 PDT