plib-users

[Plib-users] ssgLOS function - how ?

[<Rol...@t-...>]

Hello,

I'm out of ideas.
After successfully checking sphere intersection and height over terrain I need 
to check what is in front of the camera. The program moves the camera 
position in the scene, so it's a kind of first person shooter. Now I tried to 
get the intersections with ssgLOS first using an ident matrix and a vector 
pointing into the heading camera angle. I got intersections with the ground 
and the sky. Then I set the matrix to the invers camera position relative to 
the scene origin, but still the only intersections are ground and sky. I 
tried with different vectors, but no success.

Can anybody explain how to use ssgLOS, given the eye position is the camera 
and you want to get a list of all objects just straight in front of you ?

Many thanks,
Rolf
-- 
Rolf Jakob at home (rj...@du...)
WWW : http://www.franken.de/users/duffy1/rjakob (KDE-Utils and CCS)

Re: [Plib-users] OSX Project Builder

[Sebastian U. <ud...@ha...>]

On Fri, 5 Jul 2002, jp...@ro... (Jeffrey Drake) wrote:
> Date: Fri, 5 Jul 2002 13:51:30 -0400
> To: pli...@li...
> From: jp...@ro... (Jeffrey Drake)
> Subject: Re: [Plib-users] OSX Project Builder
>
> Sebastian, sorry about the direct email, I forgot about Mail.app replying
> with your address instead of the list address.

It's not the fault of your Mail application, but Sourceforge's fault. No
need to apologize - blame SF :).


> I just did a cvs checkout and moved the project over to the new directory
> and Project Builder automatically got cvs information (revisions). The
> thing I am really wondering is - is this because I have just done a cvs
> operation, and will it continue to do this? OR is it from the CVS dir?

Sorry, I am no OS-X user (except that I was recently told that Sourceforge
has an OS-X compile farm server, so I am currently testing if things
compile fine on OS-X, but that's all).

However, I guess the information comes from the CVS directories. The idea
of Project Builder parsing CVS/Entries seems logical to me.


> There are some changes that are not done, most notably is trying to
> include GL/gl.h instead of OpenGL/gl.h.

Yes - I recently discussed this issue with Darrel, and I will look after
it.


> I can't get the configure script to work from cvs, so I might just go
> ahead and make some modifications anyways to make it.

I realize that the configure script is currently broken on OS-X due to the
GL/gl.h vs OpenGl/gl.h issue. For now, as a workaround, do the following
while in the PLIB source directory:

mkdir GL
ln -s /System/Library/Frameworks/OpenGL.framework/Headers/gl.h GL/
ln -s /System/Library/Frameworks/OpenGL.framework/Headers/glu.h GL/
ln -s /System/Library/Frameworks/GLUT.framework/Headers/glut.h GL/
CPPFLAGS="-I`pwd`" ./configure

That should do.


> I would really like it if there was a way of seeing if it was being
> compiled with project builder because that would allow it to use defines
> a little easier for pb specific.

As I said before, your project files are a valuable contribution. I was
considering adding them to the PLIB CVS repository but that only makes
sense if they are maintained by somebody.


- Sebastian

Re: [Plib-users] OSX Project Builder

[Jeffrey D. <jp...@ro...>]

Sebastian, sorry about the direct email, I forgot about Mail.app replying 
with your address instead of the list address.

I just did a cvs checkout and moved the project over to the new directory 
and Project Builder automatically got cvs information (revisions). The 
thing I am really wondering is - is this because I have just done a cvs 
operation, and will it continue to do this? OR is it from the CVS dir?

There are some changes that are not done, most notably is trying to 
include GL/gl.h instead of OpenGL/gl.h.

I can't get the configure script to work from cvs, so I might just go 
ahead and make some modifications anyways to make it. I would really like 
it if there was a way of seeing if it was being compiled with project 
builder because that would allow it to use defines a little easier for pb 
specific.


On Friday, July 5, 2002, at 01:32 PM, Sebastian Ude wrote:

>
>
> On Fri, 5 Jul 2002, jp...@ro... (Jeffrey Drake) wrote:
>> Date: Fri, 5 Jul 2002 13:10:46 -0400
>> To: pli...@li...
>> From: jp...@ro... (Jeffrey Drake)
>> Subject: Re: [Plib-users] OSX Project Builder
>>
>> I guess I must apologize for the misunderstanding...  I sent you a bigger
>> archive than I guess you needed. But also, I don't know how well it would
>> work without whatever changes I made.
>
> Well, I just diffed your plib-1.4.2 directory against the original one and
> I am afraid these changes are excactly what has been done before.
>
> The Project Builder files are intresting, though. I am sure they could 
> help
> some people if they would be added to the CVS repository, but as I said,
> there is not much sense in doing so if nobody maintains them.
>
>
> - Sebastian
>
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Bringing you mounds of caffeinated joy.
> http://thinkgeek.com/sf
> _______________________________________________
> plib-users mailing list
> pli...@li...
> https://lists.sourceforge.net/lists/listinfo/plib-users
>

Re: [Plib-users] OSX Project Builder

[Sebastian U. <ud...@ha...>]

On Fri, 5 Jul 2002, jp...@ro... (Jeffrey Drake) wrote:
> Date: Fri, 5 Jul 2002 13:10:46 -0400
> To: pli...@li...
> From: jp...@ro... (Jeffrey Drake)
> Subject: Re: [Plib-users] OSX Project Builder
>
> I guess I must apologize for the misunderstanding...  I sent you a bigger
> archive than I guess you needed. But also, I don't know how well it would
> work without whatever changes I made.

Well, I just diffed your plib-1.4.2 directory against the original one and
I am afraid these changes are excactly what has been done before.

The Project Builder files are intresting, though. I am sure they could help
some people if they would be added to the CVS repository, but as I said,
there is not much sense in doing so if nobody maintains them.


- Sebastian

Re: [Plib-users] OSX Project Builder

[Jeffrey D. <jp...@ro...>]

I guess I must apologize for the misunderstanding...  I sent you a bigger 
archive than I guess you needed. But also, I don't know how well it would 
work without whatever changes I made.


On Friday, July 5, 2002, at 12:52 PM, Sebastian Ude wrote:

>
>
> On Fri, 5 Jul 2002, jp...@ro... (Jeffrey Drake) wrote:
>> Date: Fri, 5 Jul 2002 12:16:33 -0400
>> To: pli...@li...
>> From: jp...@ro... (Jeffrey Drake)
>> Subject: Re: [Plib-users] OSX Project Builder
>>
>>
>>      Maintaining them might not be possible. I did the conversion because
>> I was interested in seeing how it works for what I am doing currently.
>> 'What I am doing' can change easily. What would make it quite easy to do
>> would be to make it use __APPLE__ as I have done, instead of macintosh,
>> then some misc. header file redirections.
>
> I must alert you to look at a recent CVS snapshot in case you have played
> around with PLIB 1.4.2 or 1.5.1 all the time. Some of the changes you name
> have already been done by other OS-X developers, in particular Darrell
> Walisser. Don't waste your valuable time !
>
> What I am intrested in are the project files you have created for the OS-X
> project builder. But if it is unsure if you could maintain them in the
> future, I don't think it would be a good idea to add them to the CVS
> repository (and I think Steve would agree).
>
>
> - Sebastian
>
>
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Bringing you mounds of caffeinated joy.
> http://thinkgeek.com/sf
> _______________________________________________
> plib-users mailing list
> pli...@li...
> https://lists.sourceforge.net/lists/listinfo/plib-users
>

Re: [Plib-users] OSX Project Builder

[Sebastian U. <ud...@ha...>]

On Fri, 5 Jul 2002, jp...@ro... (Jeffrey Drake) wrote:
> Date: Fri, 5 Jul 2002 12:16:33 -0400
> To: pli...@li...
> From: jp...@ro... (Jeffrey Drake)
> Subject: Re: [Plib-users] OSX Project Builder
>
>
>      Maintaining them might not be possible. I did the conversion because
> I was interested in seeing how it works for what I am doing currently.
> 'What I am doing' can change easily. What would make it quite easy to do
> would be to make it use __APPLE__ as I have done, instead of macintosh,
> then some misc. header file redirections.

I must alert you to look at a recent CVS snapshot in case you have played
around with PLIB 1.4.2 or 1.5.1 all the time. Some of the changes you name
have already been done by other OS-X developers, in particular Darrell
Walisser. Don't waste your valuable time !

What I am intrested in are the project files you have created for the OS-X
project builder. But if it is unsure if you could maintain them in the
future, I don't think it would be a good idea to add them to the CVS
repository (and I think Steve would agree).


- Sebastian

Re: [Plib-users] OSX Project Builder

[Jeffrey D. <jp...@ro...>]

>
     Maintaining them might not be possible. I did the conversion because I 
was interested in seeing how it works for what I am doing currently. 'What 
I am doing' can change easily. What would make it quite easy to do would 
be to make it use __APPLE__ as I have done, instead of macintosh, then 
some misc. header file redirections.

I will send them to you soon.
Regards,
jptd


> Just send them to my address (ud...@ha...) and I will have a look at
> them. I think it should be no problem to add the project files to the CVS
> repository if you are willing to maintain them in the future.
>
>
> - Sebastian
>

Re: [Plib-users] OSX Project Builder

[Sebastian U. <ud...@ha...>]

On Fri, 5 Jul 2002, jp...@ro... (Jeffrey Drake) wrote:
> Date: Fri, 5 Jul 2002 03:26:14 -0400
> To: pli...@li...
> From: jp...@ro... (Jeffrey Drake)
> Subject: [Plib-users] OSX Project Builder
>
> I have successfully made a Project Builder project and modified files to
> get the entire plib to compile.
>
> I have not tested any examples yet (time for bed).
>
> For some reason the resulting library is 20mb. I can't seem to lower that
> either. It must be linking in frameworks too. It looks like it might also
> have debugging info in it, so I am trying to remove that too.
>
> Some of the changes I had to make were paths to things (like GL/gl.h 
> became OpenGL/gl.h because of the framework system).

I planned to do excactly that, too. Thanks for saving me from some work :).


> The other common case was the 'macintosh' define changing to '__APPLE'.
>
> How I changed it:
> All header changes were made so not to break any other platform, and in
> most cases marked where things were changing.
>
> I am not that concerned if anyone wants these changes, but I would happy
> to give it to anyone interested.

Just send them to my address (ud...@ha...) and I will have a look at
them. I think it should be no problem to add the project files to the CVS
repository if you are willing to maintain them in the future.


- Sebastian

[Plib-users] OSX Project Builder

[Jeffrey D. <jp...@ro...>]

I have successfully made a Project Builder project and modified files to 
get the entire plib to compile.

I have not tested any examples yet (time for bed).

For some reason the resulting library is 20mb. I can't seem to lower that 
either. It must be linking in frameworks too. It looks like it might also 
have debugging info in it, so I am trying to remove that too.

Some of the changes I had to make were paths to things (like GL/gl.h 
became OpenGL/gl.h because of the framework system). The other common case 
was the 'macintosh' define changing to '__APPLE'.

How I changed it:
All header changes were made so not to break any other platform, and in 
most cases marked where things were changing.

I am not that concerned if anyone wants these changes, but I would happy 
to give it to anyone interested. I will probably be converting parts I 
want over to objective C.

Regards,
jptd

Re: [Plib-users] exposer and CVS plib

[<Rol...@t-...>]

On Tuesday 02 July 2002 21:45, Sebastian Ude wrote:

> > Unfortunately the current CVS version breaks exposer in
> > puFileSelector::find_files().
>
> Yes, I am aware of the bug in this function and hope that I will find the
> time to fix it today or tomorrow.

Oh, that will help, thanks a lot.

Rolf
-- 
Rolf Jakob at home (rj...@du...)
WWW : http://www.franken.de/users/duffy1/rjakob (KDE-Utils and CCS)

Re: [Plib-users] exposer and CVS plib

[Sebastian U. <ud...@ha...>]

On Tue, 2 Jul 2002, Rol...@t-... (Rolf Jakob) wrote:
> Date: Tue, 2 Jul 2002 20:49:46 +0000
> To: "'pli...@li...'" 
> <pli...@li...>
> From: Rol...@t-... (Rolf Jakob)
> Subject: [Plib-users] exposer and CVS plib
>
> Hello,
>
> My guess is for using exposer to create animations I need the latest CVS
> snapshot ?

Dunno - Steve could tell, but he is on vacation.

Nevertheless, I highly recommend to use the CVS version of both PLIB and
Exposer until 1.6 is out anyway. The bugfixes and improvements to 1.5.1 are
countless.


> Unfortunately the current CVS version breaks exposer in
> puFileSelector::find_files().

Yes, I am aware of the bug in this function and hope that I will find the
time to fix it today or tomorrow.


- Sebastian

[Plib-users] exposer and CVS plib

[<Rol...@t-...>]

Hello,

My guess is for using exposer to create animations I need the latest CVS 
snapshot ?
Unfortunately the current CVS version breaks exposer in 
puFileSelector::find_files().

Is there another way to use the bones files in plib (other than using the 
newest version where ssgTween seems to be good for handling such
animations) ?

Thanks,
Rolf
-- 
Rolf Jakob at home (rj...@du...)
WWW : http://www.franken.de/users/duffy1/rjakob (KDE-Utils and CCS)

Re: [Plib-users] How to add text and scale bar on the screen?

[Sebastian U. <ud...@ha...>]

On Mon, 1 Jul 2002, ay...@wr... (Allen Yang) wrote:
> Date: Mon, 1 Jul 2002 17:06:23 -0400
> To: "'pli...@li...'" 
> <pli...@li...>
> From: ay...@wr... (Allen Yang)
> Subject: [Plib-users] How to add text and scale bar on the screen?
>
> Anyone can show me how to add text and scale bar on the screen? Thanks

Really - read:

http://plib.sourceforge.net/pui/

And look at the example programs. Feel free to come back if there are any
questions remaining after you have done so.


- Sebastian

[Plib-users] How to add text and scale bar on the screen?

[Allen Y. <ay...@wr...>]

Anyone can show me how to add text and scale bar on the screen? Thanks

Re: [Plib-users] how to do texture mapping

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

Allen Yang wrote:

> I want to add one-dimension texture for my mesh. I want to use openGL to do
> that. But I don't know how to add into ssg. Any one can help me out with
> this problem?

I wouldn't bother - it's just as easy to use a 2D texture that's one texel
wide.


---------------------------- Steve Baker -------------------------------
Mail : <sjb...@ai...>   WorkMail: <sj...@li...>
URLs : http://www.sjbaker.org
        http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
        http://prettypoly.sf.net http://freeglut.sf.net
        http://toobular.sf.net   http://lodestone.sf.net

[Plib-users] how to do texture mapping

[Allen Y. <ay...@wr...>]

Hi,
I want to add one-dimension texture for my mesh. I want to use openGL to do
that. But I don't know how to add into ssg. Any one can help me out with
this problem?

Thanks

Re: [Plib-users] How to set up scale in SSG?

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

Sam Stickland wrote:
> I think you will have problems, because. if I remember correctly, bounding
> spheres are calculated using a fast, simplified matrix multification that
> doesn't take into account scales.

Almost...There are at least two problem areas - one is that the clip code
transforms the center of the sphere into camera coordinates - then computes
the distance from that point to the various planes of the view frustum - and
compares that distance to the radius of the sphere...that's not gonna work well
with scaled matrices.

Even if you scaled the radius by the current matrix scale, you'd run into troubles
with non-homgenious scaling.

> So I think your clipping will get all messed up.

Indeed - don't do that.

----------------------------- Steve Baker -------------------------------
Mail : <sjb...@ai...>   WorkMail: <sj...@li...>
URLs : http://www.sjbaker.org
        http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
        http://prettypoly.sf.net http://freeglut.sf.net
        http://toobular.sf.net   http://lodestone.sf.net

re: [Plib-users] How to set up scale in SSG?

[David M. <da...@me...>]

Allen Yang writes:

 > Can anyone show me how to set up scale?

I think that if you pass the right magic matrix to an ssgTransform
node, everything under it will be scaled.

The answer is probably in here somewhere:

  http://www.sjbaker.org/steve/omniv/matrices_can_be_your_friends.html


All the best,


David

-- 
David Megginson, da...@me..., http://www.megginson.com/

[Plib-users] How to set up scale in SSG?

[Allen Y. <ay...@wr...>]

Can anyone show me how to set up scale?

Thanks

[Plib-users] combination of VTk and simple scene graph

[Allen Y. <ay...@wr...>]

Hi,
I have a question about combination of VTk and simple scene graph. I used
OpenGL and VTk to draw a terrain mesh on the screen. Now I switched
everything to simple scene graph. I still use the same data set which is
tranformated by VTk. However, I can't draw anything on the screen by using
SSG. I was wondering if anyone can tell me what I did wrong.

sgMat4 tempMat;
ssgGetModelviewMatrix(tempMat);

//the step id inserting all data into vtcArrays
bathyV->render();
	
meshLeaf = new ssgVtxTable(GL_TRIANGLE_STRIP,bathyV->m_vArray
						    ,bathyV->m_nArray
						,NULL
						,bathyV->m_cArray
						);
meshLeaf->setCullFace(FALSE);
mesh ->addKid(meshLeaf);

Thank you for help.

	

Re: [Plib-users] plib and shadows

[<Rol...@t-...>]

On Monday 24 June 2002 02:17, you wrote:
> Rolf,
>
> Out of intereste how did your attempt to do shadows with PLIB go ?

I gave it up for now after trying several methods.
The latest idea was to clone the scene, render it in black and project it to 
the ground. That would mean that all things cast shadows but only on the 
ground. An enhancement would be to put the projected image into a texture 
buffer and blend it on the ground. There are some examples in OpenGL together 
with a transformation matrix, but I don't really understand how this matrix 
was calculated. Due to the different coordinate system in plib I had to adapt 
it and that is hard when there is no hint how the matrix was done.
So my last attempt caused the sun to cast shadows only in a small range of 
angle, else the shadows just disappeared.

If this math problem could be solved, we should be able to have some basic 
shadow support in plib. All the functions you need are either in plib or can 
be done quiet easily.

There is a library for real time shadows (rts). The demo looks nice, but it's 
way too slow for a complex scene. Using that you would have almost perfect 
shadows where every object can cast shadow on any other and it supports 
coloured lights. So I think that the simpler approach of rendering shadows on 
the ground is a "better than nothing " method.

I can send you the version of my test program when I experimented with 
shadows (~500k incl. scene). In the current one, there is none. I still would 
like to have shadows and a better lighting, I just didn't want to loose more 
time after trying for more than a week in favour of doing other basic things 
for the game I have in mind.

I would appreciate if we could try to solve this problem together.

> The reason I'm asking is that I will need to do something like this soon

Good luck ;-)

Rolf
-- 
Rolf Jakob at home (rj...@du...)
WWW : http://www.franken.de/users/duffy1/rjakob (KDE-Utils and CCS)

Re: [Plib-users] Compiling plib under BCB5.

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

Matthew W Marshall wrote:
> I am using BCB5, and I was wondering if anyone has made a Borland Project
> Group for the compilation of plib.  If so, could they send it to me?  It
> would be far easier than making it myself.  (Go ahead, call me lazy, call
> me productive.)


I believe there once was a set of Borland project files - but nobody who
uses Borland seems to hang with the PLIB developers - so the got hopelessly
out of date and were removed.

If you go to the CVS repository on SourceForge:

    http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/plib/plib/

...and look in the 'Attic' directories for the top level - and for
each directory under 'src', you'll see they are still there - but were
removed about 11 months ago.

Still, that *might* be a useful starting point.

It would be nice to have a current set - but if nobody will ever maintain
them for us as new source files get added and old ones removed, then I'm afraid it's
a waste of time.

----------------------------- Steve Baker -------------------------------
Mail : <sjb...@ai...>   WorkMail: <sj...@li...>
URLs : http://www.sjbaker.org
        http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
        http://prettypoly.sf.net http://freeglut.sf.net
        http://toobular.sf.net   http://lodestone.sf.net

[Plib-users] Compiling plib under BCB5.

[Matthew W M. <mat...@ju...>]

I am using BCB5, and I was wondering if anyone has made a Borland Project
Group for the compilation of plib.  If so, could they send it to me?  It
would be far easier than making it myself.  (Go ahead, call me lazy, call
me productive.)
Matthew Marshall
mat...@ju... 

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Re: [Plib-users] segfault while paste

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

Sebastian Ude wrote:


>>Yes - that's what I meant...but the mechanisms for cut/paste are quite
>>different between X, Windoze and others.
> 
> Yes. However, PLIB builds a portable layer around a lot of things that are
> different between UNIX, Windows and other operating systems, so it would
> indeed be quite intresting to figure out how to implement copy & paste for
> Windows, X, MacOS (non-OSX), BeOS ...

Yes - exactly.  The only problem is that I don't understand *any* of those
mechanisms!  Heck - I don't even know how to do it within X. But I think it would
be a valuable addition if someone knows what is needed.

Ob. Cut & Paste anecdote:  My son has a 'typing' class once a week at school,
it's really boring rote work and once the children finish the typing
exercise for that day, they get to surf the web or whatever.  Since most
of the 'exercises' entail typing the same combinations of letters over
and over until you hit a certain speed rating with some limited number of
errors.  Oliver rapidly discovered that the people who wrote the typing tutor
software didn't consider that you could type the exercise once (S-L-O-W-L-Y)
and then use cut and paste to enter the entire thing a second time perfectly
and in about a millisecond!   So, Oliver basically spent the entire term
playing on the computer.  At the end-of-year awards ceremony, the school
handed out awards for highest Math score, highest Art score, etc, etc...and
lo and behold, Oliver was awarded the Typing award, as he was called up to
collect it, the teacher said something like "Oliver Baker is awarded the
typing certificate for typing...er...this must be a misprint...it says
10,000 words per minute."

      :-)

> Germany vs. USA: 1:0 !

...but...Brazil vs. England:  2:1   :-(

----------------------------- Steve Baker -------------------------------
Mail : <sjb...@ai...>   WorkMail: <sj...@li...>
URLs : http://www.sjbaker.org
        http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
        http://prettypoly.sf.net http://freeglut.sf.net
        http://toobular.sf.net   http://lodestone.sf.net

Re: [Plib-users] segfault while paste

[Sebastian U. <ud...@ha...>]

On Fri, 21 Jun 2002, sjb...@ai... (Steve Baker) wrote:
> Date: Fri, 21 Jun 2002 13:10:39 -0500
> To: ud...@ha...
> From: sjb...@ai... (Steve Baker)
> CC: pli...@li...
> Reply-To: sjb...@ai...
> Subject: Re: [Plib-users] segfault while paste

[...]

> > Errr ... Steve, it does, but only internally ! That means, you should
> > be able to copy-and-paste from a puInput to another, but not from a PUI
> > widget to a text field of some X application or vice-versa.
>
> Yes - that's what I meant...but the mechanisms for cut/paste are quite
> different between X, Windoze and others.

Yes. However, PLIB builds a portable layer around a lot of things that are
different between UNIX, Windows and other operating systems, so it would
indeed be quite intresting to figure out how to implement copy & paste for
Windows, X, MacOS (non-OSX), BeOS ...


- Sebastian

PS:

Germany vs. USA: 1:0 !