| Re: DIRECT GRAPHICS VS OBJECT GRAPHICS [message #29888] |
Sun, 24 March 2002 21:09 |
Rick Towler
Messages: 821
Registered: August 1998
|
Senior Member |
|
|
"Mukunda P Raju" <mpraju@eecs.umich.edu> wrote :
> Hello
> wether i really need VRML?..well..i basicall have HDF files
> containing some data sets and i need to get those onto 3dstudio max so
> that i can make a 3d simulation. And the guys at RSINC told me that VRML
> is the way to go. Could you suggest any better option. I hear dxf is also
> an option but im not sure what the file sizes would be. Is there a problem
> with VRML?. Whats the best option in this kinda scenario. But i guess
> answring me would require some info about 3d Studio.
> Thanks for any information you may be able to provide
>
> chao
> Muks
What sort of data do you have? Like Mark said, your initial attempt will
probably not yield the desired results. I am guessing that you need to get
the actual verticies into 3ds max. To do this you need to plot your data by
creating an IDLgrPlot (or Polyline) object.
As for the VRML or DXF question... They both are ASCII format and will both
be quite large relativly speaking but when you plot this correctly it will
not be 17MB. VRML files are far easier to write in IDL but the IDLffDXF
object is more powerful. If you just need to get the verts in, then VRML
should be fine.
-Rick
> On Fri, 22 Mar 2002, David Fanning wrote:
>
>> Mukunda P Raju (mpraju@eecs.umich.edu) writes:
>>
>>> Hello...im new to IDL and looking into a program which deals with some
>>> direct graphics...PLOTS etc...I need to convert this into object
graphics
>>> so that i can write to a VRML file. Now...ive used the existing direct
>>> graphics code and written to a Z buffer and then wrote the resultant
2d
>>> array into a IDLgrPlot object and that into a Model and then into a
View
>>> and then drew the view in a VRML object. Is this ok? The resultant
VRML
>>> file im getting is like 17MB. Thats crazy...if i instead wrote it to a
.ps
>>> or a CGM file its only half an MB...is somthing wrong here?
HEEELPPPPPP
>>
>> I'm afraid VRML is so, like, the 90's. Are you *sure* this
>> is what you want to do!?
>>
>> Cheers,
>>
>> David
>> --
>> David W. Fanning, Ph.D.
>> Fanning Software Consulting
>> Phone: 970-221-0438, E-mail: david@dfanning.com
>> Coyote's Guide to IDL Programming: http://www.dfanning.com/
>> Toll-Free IDL Book Orders: 1-888-461-0155
>>
>
|
|
|
|
| Re: DIRECT GRAPHICS VS OBJECT GRAPHICS [message #29891 is a reply to message #29888] |
Sun, 24 March 2002 13:42  |
Mark Hadfield
Messages: 783
Registered: May 1995
|
Senior Member |
|
|
"Mukunda P Raju" <mpraju@eecs.umich.edu> wrote in message
news:Pine.LNX.4.33.0203222353510.24048-100000@harvest.eecs.u mich.edu...
> Hello...im new to IDL and looking into a program which deals with
> some direct graphics...PLOTS etc...I need to convert this into
> object graphics so that i can write to a VRML file. Now...ive used
> the existing direct graphics code and written to a Z buffer and then
> wrote the resultant 2d array into a IDLgrPlot object and that into a
> Model and then into a View and then drew the view in a VRML
> object. Is this ok?
No. As I understand it, you've extracted a 2D image from the Z buffer,
loaded it into an IDLgrPlot object (thus creating a very strange
looking line plot) then rendered it to an IDLgrVRML object. This will
not work. You could load the 2D image into an IDLgrImage object and
render that. Then it might look more or less OK, but it would be a
flat representation of your scene. Sice you are going to the trouble
of using a 3D format, I doubt that this is what you want.
If you want 3D scene in an IDLgrVRML file, i"m afraid you'll have to
build it up out of Object Graphics commands. Object Graphics and
Direct Graphics are completely separate systems. The only way(*) to
pass information between them is to render the objects/commands in one
system to an image then load it into the other. This is seldom useful.
(*) OK there may be one or two other ways, left as an exercise for the
reader, but they're not very useful.
--
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)
|
|
|
|
| Re: DIRECT GRAPHICS VS OBJECT GRAPHICS [message #29901 is a reply to message #29891] |
Fri, 22 March 2002 23:18 |
Mukunda P Raju
Messages: 3
Registered: March 2002
|
Junior Member |
|
|
Hello
wether i really need VRML?..well..i basicall have HDF files
containing some data sets and i need to get those onto 3dstudio max so
that i can make a 3d simulation. And the guys at RSINC told me that VRML
is the way to go. Could you suggest any better option. I hear dxf is also
an option but im not sure what the file sizes would be. Is there a problem
with VRML?. Whats the best option in this kinda scenario. But i guess
answring me would require some info about 3d Studio.
Thanks for any information you may be able to provide
chao
Muks
On Fri, 22 Mar 2002, David Fanning wrote:
> Mukunda P Raju (mpraju@eecs.umich.edu) writes:
>
>> Hello...im new to IDL and looking into a program which deals with some
>> direct graphics...PLOTS etc...I need to convert this into object graphics
>> so that i can write to a VRML file. Now...ive used the existing direct
>> graphics code and written to a Z buffer and then wrote the resultant 2d
>> array into a IDLgrPlot object and that into a Model and then into a View
>> and then drew the view in a VRML object. Is this ok? The resultant VRML
>> file im getting is like 17MB. Thats crazy...if i instead wrote it to a .ps
>> or a CGM file its only half an MB...is somthing wrong here? HEEELPPPPPP
>
> I'm afraid VRML is so, like, the 90's. Are you *sure* this
> is what you want to do!?
>
> Cheers,
>
> David
> --
> David W. Fanning, Ph.D.
> Fanning Software Consulting
> Phone: 970-221-0438, E-mail: david@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155
>
|
|
|
|
| Re: DIRECT GRAPHICS VS OBJECT GRAPHICS [message #29902 is a reply to message #29901] |
Fri, 22 March 2002 22:23 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
Mukunda P Raju (mpraju@eecs.umich.edu) writes:
> Hello...im new to IDL and looking into a program which deals with some
> direct graphics...PLOTS etc...I need to convert this into object graphics
> so that i can write to a VRML file. Now...ive used the existing direct
> graphics code and written to a Z buffer and then wrote the resultant 2d
> array into a IDLgrPlot object and that into a Model and then into a View
> and then drew the view in a VRML object. Is this ok? The resultant VRML
> file im getting is like 17MB. Thats crazy...if i instead wrote it to a .ps
> or a CGM file its only half an MB...is somthing wrong here? HEEELPPPPPP
I'm afraid VRML is so, like, the 90's. Are you *sure* this
is what you want to do!?
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
