| Re: show a use-defined object [message #67332] |
Thu, 16 July 2009 09:24 |
rtowler
Messages: 28
Registered: June 2006
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Junior Member |
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On Jul 16, 5:10 am, David Fanning wrote:
> danyang writes:
>> But now my objects should be changed to some kind of air ballons,
>> which has hard shell with a radius of R1 and air-kern with the radius
>> of R2(R1>R2). Some of them should be cut(e.g. instead of the whole 3D
>> region just to show part of it) , in order to show their hollow
>> kern.
>
>> Is it possible to make my aim come true with 'XOBJVIEW'?
>
> XObjView doesn't have anything to do with your aim. It
> is just one way you can display your graphics hierarchy.
> There are many others. You need to concentrate on the
> hierarchy.
I suppose it depends on what aim you are talking about ;)
But David's point is a good one. You've created some orbs and (I am
assuming) displayed them. Now you want to display a custom object and
you have to "build" it. The best way to approach this would be to
create your own object by subclassing IDLgrModel. You'll have to come
up with the meshing routine yourself but you'll probably want to look
at orb__define.pro as a place to start. In fact, orb__define.pro is
also an example of how to subclass IDLgrModel so you may want to just
copy it and start modifying it for your needs. You'll want to look at
the MESH_CLIP function too. I don't really understand what you're
after, but maybe the init method of your new balloon class would take
a inner and outer radius, position (x,y,z) and an optional clipping
plane and it would create your object. Then you would use this new
class just like you used orb initially.
Once you get to this point, then you can worry about moving from
XOBJVIEW to a more flexible display technique.
-Rick
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| Re: show a use-defined object [message #67336 is a reply to message #67332] |
Thu, 16 July 2009 05:10  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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danyang writes:
> n fact, I have more than 1000 objects. I can get their positions from
> an ASCII file. Therefore, I used a 'for' loop to put them into a show
> window.
> My objects were spheres. That's why there was an 'orb' in my code. In
> this step, I don't have any more questions.
>
> But now my objects should be changed to some kind of air ballons,
> which has hard shell with a radius of R1 and air-kern with the radius
> of R2(R1>R2). Some of them should be cut(e.g. instead of the whole 3D
> region just to show part of it) , in order to show their hollow
> kern.
>
> Is it possible to make my aim come true with 'XOBJVIEW'?
XObjView doesn't have anything to do with your aim. It
is just one way you can display your graphics hierarchy.
There are many others. You need to concentrate on the
hierarchy.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: show a use-defined object [message #67339 is a reply to message #67336] |
Thu, 16 July 2009 02:24 |
danyang
Messages: 2
Registered: July 2009
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Junior Member |
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On Jul 15, 6:18 pm, rtowler <rtow...@gmail.com> wrote:
> On Jul 15, 5:32 am, David Fanning <n...@dfanning.com> wrote:
>
>
>
>> danyang writes:
>>> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1,$
>>> POS=[x(i),y(i),z(i)], select_target=0) ;to define a ball
>
>>> oModel->Add, s
>>> XOBJVIEW, oModel
>
>> You don't tell us where you are trying to position
>> the object, and my guess (from working with object
>> graphics in general) is that you are positioning
>> the object outside the viewplane rectangle. In
>> any case, to just answer your question, this works:
>
>> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1)
>> XOBJVIEW, s
>
> XOBJVIEW will automatically determine the extents of all objects
> contained in the model hierarchy and it sets up the view such that it
> is centered on these extents. So usually position is not an issue.
>
> oModel = obj_new('IDLgrModel')
> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1, $
> POS=[4,13,10], select_target=0)
> oModel->add, s
> t = obj_new('orb',color=[250,250,250],radius=0.25,shading=1, $
> POS=[14,23,3], select_target=0)
> oModel->add, t
>
> XOBJVIEW, oModel
>
> I suspect there is something else going on. Post more of your code.
>
> -Rick
Thank you, Rick.
Yes, your suspection is right. As I discribed in the last post, my
question is how to show over 1000 air ballons in one 3D region.
Furthermore, some of ballons should be cut by changing the show
region, in order to show their hollow kern.
Is XOBJVIEW a better solution?
Thanks,
Danyang
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| Re: show a use-defined object [message #67340 is a reply to message #67339] |
Thu, 16 July 2009 02:16 |
danyang
Messages: 2
Registered: July 2009
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Junior Member |
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On Jul 15, 2:32 pm, David Fanning <n...@dfanning.com> wrote:
> danyang writes:
>> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1,$
>> POS=[x(i),y(i),z(i)], select_target=0) ;to define a ball
>
>> oModel->Add, s
>> XOBJVIEW, oModel
>
> You don't tell us where you are trying to position
> the object, and my guess (from working with object
> graphics in general) is that you are positioning
> the object outside the viewplane rectangle. In
> any case, to just answer your question, this works:
>
> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1)
> XOBJVIEW, s
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Thanks for your kindness.
In fact, I have more than 1000 objects. I can get their positions from
an ASCII file. Therefore, I used a 'for' loop to put them into a show
window.
My objects were spheres. That's why there was an 'orb' in my code. In
this step, I don't have any more questions.
But now my objects should be changed to some kind of air ballons,
which has hard shell with a radius of R1 and air-kern with the radius
of R2(R1>R2). Some of them should be cut(e.g. instead of the whole 3D
region just to show part of it) , in order to show their hollow
kern.
Is it possible to make my aim come true with 'XOBJVIEW'?
Thanks,
Danyang
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| Re: show a use-defined object [message #67350 is a reply to message #67340] |
Wed, 15 July 2009 09:18 |
rtowler
Messages: 28
Registered: June 2006
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Junior Member |
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On Jul 15, 5:32 am, David Fanning <n...@dfanning.com> wrote:
> danyang writes:
>> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1,$
>> POS=[x(i),y(i),z(i)], select_target=0) ;to define a ball
>
>> oModel->Add, s
>> XOBJVIEW, oModel
>
> You don't tell us where you are trying to position
> the object, and my guess (from working with object
> graphics in general) is that you are positioning
> the object outside the viewplane rectangle. In
> any case, to just answer your question, this works:
>
> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1)
> XOBJVIEW, s
>
XOBJVIEW will automatically determine the extents of all objects
contained in the model hierarchy and it sets up the view such that it
is centered on these extents. So usually position is not an issue.
oModel = obj_new('IDLgrModel')
s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1, $
POS=[4,13,10], select_target=0)
oModel->add, s
t = obj_new('orb',color=[250,250,250],radius=0.25,shading=1, $
POS=[14,23,3], select_target=0)
oModel->add, t
XOBJVIEW, oModel
I suspect there is something else going on. Post more of your code.
-Rick
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| Re: show a use-defined object [message #67355 is a reply to message #67350] |
Wed, 15 July 2009 05:32 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
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danyang writes:
> s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1,$
> POS=[x(i),y(i),z(i)], select_target=0) ;to define a ball
>
> oModel->Add, s
> XOBJVIEW, oModel
You don't tell us where you are trying to position
the object, and my guess (from working with object
graphics in general) is that you are positioning
the object outside the viewplane rectangle. In
any case, to just answer your question, this works:
s = obj_new('orb',color=[250,250,250],radius=0.25,shading=1)
XOBJVIEW, s
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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