Maarten

A few weeks ago we investigated the best way to use multiple fullscreen outputs.

The best way to deal with this is using multiple context doing the

same things in stead of one context and switching renders.

When using this some other fine tuning is aquired when wanting to

I prepared a patch for testing and maybe posting solutions.

I already tried lookat & lens_angle but I couldn't get my mind around

In the example patch I moved the second render with -2.15 0. 0. so

logically I thought the camera needs to look at -2.15 0. 2. (Actually,

just moving works fine when not using the z)

When I however turn in z using the handles, the screens do not align

anymore. Does anybody has any hints how to counter that?

The best way to deal with this is using multiple context doing the
same things in stead of one context and switching renders.

When using this some other fine tuning is aquired when wanting to
transform in the z axis.
I prepared a patch for testing and maybe posting solutions.

I already tried lookat & lens_angle but I couldn't get my mind around
it that way.

In the example patch I moved the second render with -2.15 0. 0. so
logically I thought the camera needs to look at -2.15 0. 2. (Actually,
just moving works fine when not using the z)

When I however turn in z using the handles, the screens do not align
anymore. Does anybody has any hints how to counter that?

mutiple-render-contexts-and-camera

It is offcourse obvious that this works in this way.

Where "."'s are camera's with an angle of 45 degrees

"/" and "" indicates where the viewing edges are of those camera's

X marks the crossing point of those lines. Then all behaviour is explained, what i however want to reach is this

Where the two camera's look straight ahead and do not cross each others path of viewing.

Where  "."'s are camera's with an angle of 45 degrees
"/" and "" indicates where the viewing edges are of those camera's

X marks the crossing point of those lines. Then all behaviour is explained, what i however want to reach is this
|   |   |
|   |   |
--.--.--

All I can say is you have to transform the position and rotation of one

camera in relation to the other. I started a tread about stuff like this

because basically want to do the same, but with an object in relation to the

camera. I started working on it, but got stuck and haven't found the time

and courage to get my head around it since then. You can check out

https://cycling74.com/forums/index.php?t=msg&goto=619

All I can say is you have to transform the position and rotation of one
camera in relation to the other. I started a tread about stuff like this
because basically want to do the same, but with an object in relation to the
camera. I started working on it, but got stuck and haven't found the time
and courage to get my head around it since then. You can check out
the topic here.

  https://cycling74.com/forums/index.php?t=msg&goto=619 38&r id=0&srch=3d+coordinate#msg_61938

There's a type of lens out there that doesn't cary depth information

in the final image. I think it might do something close to what you

describe, but I can't for the life of me remember what that type of

lens was called. I tried searching for othogonal lens and didn't turn

anything up. I believe this type of lens is used by computer vision

people most often because of the unique properties of the image.

Of course, I could be constructing a memory from nothing and this

could all be lies. But for some reason, I have this idea of a type of

lens that distorts the image in such a way that apparent depth is

There's a type of lens out there that doesn't cary depth information
in the final image.  I think it might do something close to what you
describe, but I can't for the life of me remember what that type of
lens was called.  I tried searching for othogonal lens and didn't turn
anything up.  I believe this type of lens is used by computer vision
people most often because of the unique properties of the image.

Of course, I could be constructing a memory from nothing and this
could all be lies.  But for some reason, I have this idea of a type of
lens that distorts the image in such a way that apparent depth is
lost.

i' have not tried this, but what your are suggesting seems to be 

orthographic. see the @ortho attribute of jit.gl.render

what if you had two cameras with angles of 22.5 each with their 

adjacent edges/clipping planes aligned.. something like:

> what i however want to reach is this
> |   |   |
> |   |   |
> --.--.--

i' have not tried this, but what your are suggesting seems to be  
orthographic. see the @ortho attribute of jit.gl.render

another thought,
what if you had two cameras with angles of 22.5 each with their  
adjacent edges/clipping planes aligned.. something like:

   |   /
    |  /
    | /
    |/
----.----

Whoops, I thought you were talking about real cameras.

i'm using the command ortho 0/1/2 for an orthogonal viewport 

projection. 0=off, 1/2=different versions of ortho, i forgot what 

i'm using the command ortho 0/1/2 for an orthogonal viewport  
projection. 0=off, 1/2=different versions of ortho, i forgot what  
exactly.

I just tried Ortho, forgot the function existed. :)

it seems to get rid of some of the cludder or messiness but it doesn't

Maybe using Ortho with some rotation or camera functions will do the trick.

Thijs thnx for the link, I will look into it.

Thnx for pointing out ortho and for getting me some steps closer.

it seems to get rid of some of the cludder or messiness but it doesn't
align properly.
Maybe using Ortho with some rotation or camera functions will do the trick.

In reply to Jonathan placing them in one point hint.

I'm actually not using two but more camera's if you get more you will

I'm actually not using two but more camera's if you get more you will
eventually make circle I think.


Well I made it work with the example patch in my first post. However I

offcourse loose the z axis in the process. So I will have to do some

testing how to solve that when using multiple objects. I guess I will

have use scaling instead of z positioning

It will do for the given patch, it is however a simplification of a

Thnx for pointing out Ortho, I forgot it was there.

Well I made it work with the example patch in my first post. However I
offcourse loose the z axis in the process. So I will have to do some
testing how to solve that when using multiple objects. I guess I will
have use scaling instead of z positioning

It will do for the given patch, it is however a simplification of a
more complex patch.
Thnx for pointing out Ortho, I forgot it was there.

mutiple render contexts and camera