plib-users

Re: [Plib-users] PuSlider rendering problem

[Steve B. <sjb...@ai...>]

Paolo Gilardetti wrote:
> Hi,
> I tried to modify viewer.cxx, now it opens a new window with two sliders when an user press 's' buttom. I simply copy the code from complex.cxx and put it into viewer.cxx. This stuff doesn't work: the fonts in "slider window" aren't readable and the rendering in the first window appears to be "cutted" (please see figure in attachment).
> 
> Could anyone give me an hint about the causes of these problems?

Probably: Textures aren't being shared across rendering contexts and the Z-near clip plane is what's
cutting off the model.

---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net
-----BEGIN GEEK CODE BLOCK-----
GCS d-- s:+ a+ C++++$ UL+++$ P--- L++++$ E--- W+++ N o+ K? w--- !O M-
V-- PS++ PE- Y-- PGP-- t+ 5 X R+++ tv b++ DI++ D G+ e++ h--(-) r+++ y++++
-----END GEEK CODE BLOCK-----

[Plib-users] PuSlider rendering problem

[Paolo G. <p.g...@li...>]

Hi,
I tried to modify viewer.cxx, now it opens a new window with two sliders when an user press 's' buttom. I simply copy the code from complex.cxx and put it into viewer.cxx. This stuff doesn't work: the fonts in "slider window" aren't readable and the rendering in the first window appears to be "cutted" (please see figure in attachment).

Could anyone give me an hint about the causes of these problems?

Thanks a lot,
Paolo

Re: [Plib-users] Re:texture coods

[Wolfram K. <w_...@rz...>]

Yes, it is a really strange problem and happens with all sort of 2D
formats and obviously with different 3D formats as well (I have it
with *.MDL). "good" objects are reproducably good and bad reproducably
bad, so it has to be in the 3D model file or the texture file. For me
it happened with *.pcx textures.

I am seriously considering to have a PPE feature to invert the display
so a user can easily check for this problem after loading an object,
but of course it only cures a symptom and only helps a few people.

Bye bye,
Wolfram.

[Plib-users] Mouse over highlighting (PUI)

[Karl M. H. <Kar...@gm...>]

Hi,

I implemented a puPopupMenu, which works fine for me, the only thing that
I didn't manage to get working was highlighting menu items on mouse over
(They are highlighted when the right mouse button is pressed). Is there
any way to get this highlighting to work for mouseover as well?
I call puMouse from my glutMotion function, but that didn't seem to change
anything.

Karl Moritz

[Plib-users] Re:texture coods

[Luca M. <luc...@li...>]

I use the RGB format, but I don't know if there's a flag like in the BMP =
format. I know only that after  putting the textures in 3ds,when I render=
 the object it looks good. Instead, when I launch FlightGear, I've to fli=
p ALL (and all on the same line) the textures to make them look right. =0D
=
I've tried to use the flipped ones in 3ds but they have the same problem =
that has FlightGear. If I play with the new textures to make them look ri=
ght, the problem moves (another time ...) from 3ds to FlightGear. Maybe t=
here's a flag like BMP images (but I've read the image specification form=
at and I don't find it).

Hi,

Luca 

Re: [Plib-users] Re: texture coords

[Steve B. <sjb...@ai...>]

Luca Masera wrote:
> Hi,
> 
> Due to what do you have write, I think that the problem is in the exporter of 3dsMAX, or inside 3ds. However flipping the texture I solve all the problems. 

Are you sure it isn't the actual texture?

One problem we know about is that there is a flag in BMP format images that says which way up they are.
There is a problem that some tools ignore that flag and some don't.   This can make for very ugly
situations of exactly the kind we are seeing here.

There isn't a good fix for it because there is a lot of inconsistancy in the way BMP's are handled.

---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net
-----BEGIN GEEK CODE BLOCK-----
GCS d-- s:+ a+ C++++$ UL+++$ P--- L++++$ E--- W+++ N o+ K? w--- !O M-
V-- PS++ PE- Y-- PGP-- t+ 5 X R+++ tv b++ DI++ D G+ e++ h--(-) r+++ y++++
-----END GEEK CODE BLOCK-----

[Plib-users] Re: texture coords

[Luca M. <luc...@li...>]

Hi,

Due to what do you have write, I think that the problem is in the =
exporter of 3dsMAX, or inside 3ds. However flipping the texture I solve a=
ll the problems. 

Tanks, 
Luca

Re: [Plib-users] Texture coords

[Per L. <li...@ho...>]

Hi,
I don't have a definitive answer to this, but I seem to remember from when I
wrote the 3DS loader for PLIB that 3D Studio seems to have weird conventions for
handling texture coordinate. Textures from *some* image formats were flipped
upside down, while others were not. For example, you can find this kludge in the
ssgLoad3ds.cxx:

      /* flip textures y-coord if texture is a BMP */
      char *texture_extension =
         material->tex_name + strlen(material->tex_name) - 3;
      flip_texture_y = ulStrEqual( texture_extension, "BMP" );

...so it seems 3D Studio does *something* weird to texture coordinates. (In the
case of BMP, it might have to do with the fact that the image data is actually
stored "bottom row first" in the file as a default... dunno if the people who
wrote 3D Studio just missed that fact, causing all models using BMP textures to
be flipped?). I seem to recall that someone reported nasty stuff such as *some*
BMP-textured 3DS objects STILL turned up with the textures upside down, meaning
3D Studio doesn't always store the coordinates the same way. Ugh. I don't want
to think about that... ;-)

Anyway, I don't know what the correct solution to this is, but perhaps this is
yet another special case that should be handled in the ASE-loader, since 3D
Studio does weird stuff?

Regards,
Per Liedman

----- Original Message ----- 
From: "Luca Masera" <luc...@li...>
To: "plib-users" <pli...@li...>
Sent: Wednesday, January 14, 2004 9:51 AM
Subject: [Plib-users] Texture coords


> Rotated 180 degrees or mirrored?

Excuse me, they are vertically mirrored (not rotated). However, after putting
them on the airplane in 3DS and exporting the object in the .ASE format, before
launching FlightGear I open all the texture files and I mirror them. In this way
they look ok in the program. Could be the cause the fact that 3DS opens the
files and "reads from left to right", instead the library "reads from right to
left" (It's only a personal congetture...)?

Bye,
Luca



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[Plib-users] Texture coords

[Luca M. <luc...@li...>]

> Rotated 180 degrees or mirrored?

Excuse me, they are vertically mirr=
ored (not rotated). However, after putting them on the airplane in 3DS an=
d exporting the object in the .ASE format, before launching FlightGear I =
open all the texture files and I mirror them. In this way they look ok in=
 the program. Could be the cause the fact that 3DS opens the files and "r=
eads from left to right", instead the library "reads from right to left" =
(It's only a personal congetture...)?

Bye,
Luca

Re: [Plib-users] Pherarps a bug founded about the .ASE files

[Wolfram K. <w_...@rz...>]

Hi,

>(they look correct in 3DSMAX while they appear rotated of 180 degrees in=
 FlightGear)=20

Rotated 180 degrees or mirrored?

>I think that's a bug about the textures coordinates of .ASE files.

Well, it's trivial to mirror the texture coordinates, but the question
is WHEN (IOW, under which circumstances) do you mirror them ? If you
always mirror, then in the cases that now work, it will be wrong. It
would certainly be interesting and helpful to know the root cause.

I know that Innes simply mirrors the textures in a paint proggie (like
Gimp) when a problem arises.


>Thanks,
>
>Luca

Bye bye,
Wolfram.

[Plib-users] Pherarps a bug founded about the .ASE files

[Luca M. <luc...@li...>]

I solved the problem about the incorrect textures loading of .ASE files (=
they look correct in 3DSMAX while they appear rotated of 180 degrees in F=
lightGear) rotating them before launching the program. I think that's a b=
ug about the textures coordinates of .ASE files.

Thanks,

Luca

Re: [Plib-users] Vector intersection testing

[Karl M. H. <Kar...@gm...>]

It's me again.

I think I sent this to the wrong list first, moving it to plib-devel now.

Since nobody answered to my problem, if had to solve it myself :-)
I solve my problem using gluUnproject and ssgLOS with some 
matrix transformations first. The result is a function
getScreenIsect (int x, int y) ;
which returns a list of ssgLOS hit results. 
I'm not a very professional programmer, so the code is probably
ugly and slow, but if anyone wants it, just contact me.
I still think this should be a plib core feature, and would be happy
to commit my function to plib (someone should have a look at it
first, though).

Karl Moritz

On Wednesday 31 December 2003 11:29 am, Karl Moritz Hermann wrote:
> Hello,
>
> I'm new to this list, sorry if I repeat anything. I was searching
> the sourceforge archive on this topic, and found one thread, but
> the matter wasn't resolved in there.
>
> I'm using the mouse routine to start some pathfinding algorithm,
> and need to find out, which point on the ssgRoot the mouse points
> to.
> To do this, I would need to intersect a vector (direction of campos,
> starting at mouse coordinates) with the scene.
> I tried using ssgLOS, but looking in the sourcecode of plib, it seems
> that ssgLOS is only intersecting a vector (0,0,0) + x (s), and I don't
> see how to intersect a vector not starting at (0,0,0).
>
> Are there any solutions for this problem in plib (I'm using the CVS
> version), or do I need to write a function for that from scratch?
> I think such a vector intersection function would be quite useful for many
> applications (Basically for all applications using the mouse for more than
> clicking on buttons or stirring some vehicle). I'd be happy to implement
> such a function into ssg if there isn't already some functionality covering
> that problem.
>
> A happy new year,
>
> Karl Moritz
>
>
>
>
> -------------------------------------------------------
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[Plib-users] Using PLIB to load the .ASE files

[Luca M. <luc...@li...>]

Hi everyone,

there's someone that could help me to correcty configure,=
 create... the .ASE files so they could be load in FlightGear? I've a pro=
blem about the textures. In 3DSMax they look ok, but, when I launch Fligh=
tGear they appear rotated of 180 degrees. Anyone knows where is the probl=
em? I've made several attempts (rotating the texture in 3DS, rotating the=
 texture itself, etc...) but I wasn't able to solve the problem.

Thank=
s

Luca 

[Plib-users] Audio problem

[Lars C. <la...@be...>]

Hi,

I have a problem with FlightGear and other plib applications (even the
plib example programs). The audio isn't working correctly. It does make
a lot of noise, but it sounds like the driver and the application
doesn't agree on the format, e.g. signedness or sample size.

strace reveals that the sound driver isn't set up right:

open("/dev/dsp", O_WRONLY|O_NONBLOCK)   = 12
ioctl(12, SNDCTL_DSP_SETFRAGMENT, 0xbffff6a8) = 0
ioctl(12, SOUND_PCM_READ_CHANNELS, 0xbffff6a4) = 0
ioctl(12, SNDCTL_DSP_SETFMT, 0xbffff6a0) = 0
ioctl(12, SOUND_PCM_READ_RATE, 0xbffff69c) = 0

I.e. number of channels and sample rate is set for READ, not WRITE.

I do not have these problems with any other software (sox, mplayer,
mikmod etc.), and it seem to be common to plib programs (tried
FlightGear and plib example programs).

Any ideas?

Regards,
Lars

[Plib-users] Vector intersection testing

[Karl M. H. <Kar...@gm...>]

Hello,

I'm new to this list, sorry if I repeat anything. I was searching
the sourceforge archive on this topic, and found one thread, but
the matter wasn't resolved in there.

I'm using the mouse routine to start some pathfinding algorithm,
and need to find out, which point on the ssgRoot the mouse points
to. 
To do this, I would need to intersect a vector (direction of campos,
starting at mouse coordinates) with the scene.
I tried using ssgLOS, but looking in the sourcecode of plib, it seems
that ssgLOS is only intersecting a vector (0,0,0) + x (s), and I don't
see how to intersect a vector not starting at (0,0,0).

Are there any solutions for this problem in plib (I'm using the CVS version),
or do I need to write a function for that from scratch?
I think such a vector intersection function would be quite useful for many
applications (Basically for all applications using the mouse for more than
clicking on buttons or stirring some vehicle). I'd be happy to implement
such a function into ssg if there isn't already some functionality covering 
that problem.

A happy new year,

Karl Moritz

[Plib-users] ssg bounce?

[Simon <sim...@ho...>]

Hi, you were right about type casting.  That was a big part of getting =
ssg
to work with Builder.  Now I'm working on the theory side of things.  I =
want
to recreate this test scene I found a while ago.  It involves dice =
falling
onto some stairs and then bouncing down them, colliding with each other
also.  I've kind of merged the save and load demo with the dynamics demo =
and
I was hoping that someone could clear some things up for me.

=20

Currently I'm using a single dice with a stair model.  These are both
declared as ssgTransform's.  I then declare a couple more objects as
ssgParticles.  I link the two particle objects with a spring dampener =
and
then update the dice and stair objects using updateSMD().  Basically it
works the same as the dynamics demo except I've set it to work with a =
single
dice and not an array of 10.

=20

At the moment the dice just falls and bounces near the top of the =
stairs,
where does the spring reside?  Is it applied from the top most point of =
the
object or does it surround the whole object.  Do I even need a spring to =
get
the dice to fall down the stairs, I thought originally that I would test
face collisions and then work out bounce vectors from that.=20

=20

I've read the online ssg documentation and plowed through all the demos. =
 I
think my brain is just having trouble grasping some basic principles =
here,
can someone please give me an overview of where I should look to achieve =
my
test scene.

=20

Thanks

-simon=20

[Plib-users] I've done it!!!

[Simon <sim...@ho...>]

Hi, I did it, I got the ssg dynamics demo to build under Borland C++ Builder
6.  I almost cried!  There was quite a lot to do to get things to work.
Once I realised that things could actually just be wrong and needed fixing
it was easy.  I'll write up the process if anybody is interested.

Re: [Plib-users] Borland Builder 6 PLIB guide

[Wolfram K. <w_...@rz...>]

Interesting text.

Bye bye,
Wolfram.

Re: [Plib-users] borland ssg progress??

[Wolfram K. <w_...@rz...>]

Did you try a cast?

Bye bye,
Wolfram.

Re: [Plib-users] Cant get ssg to work

[Wolfram K. <w_...@rz...>]

Hi,

> I keep receiving this error:=20
>
>ssgLoaderWriterStuff.h : declaration terminated incorrectly=20
>
>and it points to this line near the top of the ssgListOfLists class:
>
>ssgListOfLists( int init =3D 3 ) : ssgSimpleList(sizeof(class =
ssgSimpleList*),
>init ) {}
>
>I don't understand why it isn't working.  I've tried all my tricks that =
I
>used to get pui working and nothing seems to work.  I'm using
>ssgLoaderWriterStuff.h v 1.22.

1.22 is the newest. I suggest you remove one thing from that line
after the other to see where the problem is. Once that is known, we
can think of a workaround.=20

=46or example, replace the sizeof with a hardcoded number, remove the "=3D
3", replace ther "init" with something simpler etc.

Bye bye,
Wolfram.

[Plib-users] borland ssg progress??

[Simon <sim...@ho...>]

Hi all, ok I think I'm making progress but I've hit a bump.  This is =
really
a general programming question, throughout ssg you use strrchr.  This
returns in several forms.  The area I'm stuck on now is:

=20

return strchr( string, c );

=20

in the mystrchr() method, within ssgParser.  The error is to do with
converting a const char* to a char*.  I've read up on what might be =
causing
the problem and I think I found it.  In the Borland strchr help
documentation it specifies the different formats for the command.  I
extracted the following:

=20

char *strchr(const char *s, int c);             /* C only */

const char *strchr(const char *s, int c);    // C++ only

char *strchr( char *s, int c);                     // C++ only

=20

It looks like the usage you've used in ssg is the "c only" one.  Is this
some funny limitation of the windows version?  How can I get around =
this?  I
think once I've fixed this then ssg will compile under Borland.

=20

Thanks in advance

-simon

[Plib-users] Cant get ssg to work

[Simon <sim...@ho...>]

Hi all, it's been a while since I used plib.  I used to use pui all the
time.  Now I'm trying to get to grips with ssg.  I've tried several =
times
now and each time I give up.  I use Borland Builder 6 on Windows XP.  =
I'm
trying to get the ssg dynamics example to build.  I'm using the same
procedure as I did for pui but I keep receiving this error:

=20

ssgLoaderWriterStuff.h : declaration terminated incorrectly

=20

and it points to this line near the top of the ssgListOfLists class:

=20

ssgListOfLists( int init =3D 3 ) : ssgSimpleList(sizeof(class =
ssgSimpleList*),
init ) {}

=20

I don't understand why it isn't working.  I've tried all my tricks that =
I
used to get pui working and nothing seems to work.  I'm using
ssgLoaderWriterStuff.h v 1.22.

=20

Thanks in advance, and I'll thank you again later

Re: [Plib-users] importing models

[Steve B. <sjb...@ai...>]

Eric Lavigne wrote:
> According to the SSG docs, the only model formats which can be
> "animated" in PLIB are the native SSG format and 3ds's ASE files. Many
> other formats can be imported, but not animated.

That's all the standard loaders let you do - but it's quite easy
to label a node in the scene graph with a 'comment' string (in modellers
like AC3D that support that) - and have the application replace those
nodes with animation nodes.

---------------------------- Steve Baker -------------------------
HomeEmail: <sjb...@ai...>    WorkEmail: <sj...@li...>
HomePage : http://www.sjbaker.org
Projects : http://plib.sf.net    http://tuxaqfh.sf.net
            http://tuxkart.sf.net http://prettypoly.sf.net
-----BEGIN GEEK CODE BLOCK-----
GCS d-- s:+ a+ C++++$ UL+++$ P--- L++++$ E--- W+++ N o+ K? w--- !O M-
V-- PS++ PE- Y-- PGP-- t+ 5 X R+++ tv b++ DI++ D G+ e++ h--(-) r+++ y++++
-----END GEEK CODE BLOCK-----

[Plib-users] importing models

[Eric L. <la...@uf...>]

According to the SSG docs, the only model formats which can be
"animated" in PLIB are the native SSG format and 3ds's ASE files. Many
other formats can be imported, but not animated.

Two questions:

Can other formats be animated in PLIB (maybe the doc is outdated)?

Is there a free or cheap tool for converting other formats into ASE or
SSG (milkshape exports a 3ds file, but I think that is .max rather than
.ase)?

Any feedback is appreciated.
Eric

[Plib-users] Borland Builder 6 PLIB guide

[Simon <sim...@ho...>]

Hi, I wrote this a while ago as part of my final year project.  It's a short
tutorial on installing and using PLIB in Borland Builder 6 on Windows 2000
and XP.  The guide uses the pui "complex" example.

 

http://www.millington.no-ip.org <http://www.millington.no-ip.org/> 

 

under "tutorials".

 

Hope this helps

-DM

 

ps - the section called tedium (on the flash site) wasn't aimed at plib its
just a way of life with builder!