Brian Furtaw (brian++at++dingbat.clubfed.sgi.com)
Mon, 21 Apr 1997 09:49:00 -0400
I have not had time to try your code out, but I did take a look at
Performer-2.0.2 it does support 3d textures. Have you tried other sizes say 16
or 28?
Brian
> Subject: (Fwd) 3d textures in performer - try two...
> --- Forwarded mail from ken sartor <sartor++at++bur.visidyne.com>
>
> Organization: Visidyne Inc.
> X-Sender: sartor++at++mail.bur.visidyne.com
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> Date: Sat, 19 Apr 1997 11:38:11 -0500
> To: info-performer++at++sgi.com
> From: ken sartor <sartor++at++bur.visidyne.com>
> Subject: 3d textures in performer - try two...
>
>
> Hi -
>
> I have been trying to get 3d texuring to work in the Performer
> environment. However, i cannot get the PF_R coordinate to
> do anything. Below is a code fragment that works when i use
> PF_S and PF_T (it just puts a checkerboard texture on the geometry).
> BUT when i try to set maxz (the coordinate that is used by PF_R)
> to some number (say 4) no texturing takes place...
>
> Am i doing something wrong? Or does Performer 2.0.2 not allow
> me to use the PF_R coordinate? Is using 3d textures possible in
> Performer?
>
> BTW - i am running IRIX 6.2 on a 1 RM4 RE2 w/ Performer 2.0.2.
>
> Thanks for any help you can provide!
>
> ken
>
>
> Code fragment for 3d texturing...
> -------------------------------------------------------------------------
> // texture experiment...
> int maxx=4, maxy=4, maxz=1, kjs;
> // Make a checkerboard texture.
> for (int iz=0; iz<maxz; iz++) {
> for (int iy=0; iy<maxy; iy++) {
> for (int ix=0; ix<maxx; ix++) {
> kjs = iz*maxx*maxy + iy*maxx + ix;
> // printf(" kjs = %d ix = %d iy = %d iz = %d \n", kjs, ix, iy,
iz);
> // rbga colors are loaded here.
> if ( iz%2 == 0)
> {
> if ( iy%2 == 0)
> {
> if ( kjs%2 == 0 )
> tex_image[kjs] = 0x0000ffff;
> else
> tex_image[kjs] = 0x000000ff;
> }
> else
> {
> if ( kjs%2 == 0 )
> tex_image[kjs] = 0x000000ff;
> else
> tex_image[kjs] = 0x0000ffff;
> }
> }
> else
> {
> if ( iy%2 == 0)
> {
> if ( kjs%2 != 0 )
> tex_image[kjs] = 0x0000ffff;
> else
> tex_image[kjs] = 0x000000ff;
> }
> else
> {
> if ( kjs%2 != 0 )
> tex_image[kjs] = 0x000000ff;
> else
> tex_image[kjs] = 0x0000ffff;
> }
> }
> }
> }
> }
>
> // Set up the texturing stuff...
> pfGStateMode(gstate2, PFSTATE_ENTEXTURE, PF_ON);
> pfGStateAttr(gstate2, PFSTATE_TEXTURE, tex );
> pfGStateAttr(gstate2, PFSTATE_TEXENV, tev);
> pfGStateMode(gstate2, PFSTATE_ENTEXGEN, PF_ON);
> pfGStateAttr(gstate2, PFSTATE_TEXGEN, tgen );
>
> pfTEnvMode(tev, PFTE_DECAL);
>
> pfTGenPlane(tgen, PF_S, 1.0e-2, 0.0, 0.0, 0.0);
> pfTGenPlane(tgen, PF_T, 0.0, 0.0, 1.0e-2, 0.0);
> pfTGenPlane(tgen, PF_R, 0.0, 1.0e-2, 0.0, 0.0);
> pfTGenMode(tgen, PF_S, PFTG_OBJECT_LINEAR);
> pfTGenMode(tgen, PF_T, PFTG_OBJECT_LINEAR);
> pfTGenMode(tgen, PF_R, PFTG_OBJECT_LINEAR);
> pfTexRepeat(tex, PFTEX_WRAP_S, PFTEX_REPEAT);
> pfTexRepeat(tex, PFTEX_WRAP_T, PFTEX_REPEAT);
> pfTexRepeat(tex, PFTEX_WRAP_R, PFTEX_REPEAT);
> pfTexImage(tex, tex_image, 4, maxx, maxy, maxz);
>
> // End texture experiment...
> -------------------------------------------------------------------------
>
> =======================================================================
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>
> ---End of forwarded mail from ken sartor <sartor++at++bur.visidyne.com>
--
----oOOo---- ----oOOo---- ----oOOo---- ----oOOo----
Brian Furtaw (brian++at++sgi.com)
VisSim Technical Consultant
12200-G Plum Orchard Drive Office:(410)796-0394 Fax: (301)872-3293
Silver Spring, Maryland 20904 OpenGL/ImageVision/OpenInventor/Performer
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