[Users] How-to: extract a 3D enveloppe of a chimney ?

[Geert de Bruin]

Dear All,

I have uploaded a powerpoint presentation to our website, explaining  
in detail the workflow which Friso explained.

http://www2.dgb-group.com/technical-updates.html
ftp://ftp.dgb-group.com/pub/for_users/Visualisation.pps

Furthermore, in the new development release there will be a new  
visualisation technique: implicit representation. This functionality  
is still under development but already it  enables you to display an  
iso-surface in a volume. This is exactly the "envelope in 3D" that  
Aurelien is talking about. The presentation explains the workflow how  
to display iso-surface as well

Best regards,

Geert

On Dec 10, 2007, at 4:35 PM, Friso Brouwer wrote:

> Dear Aurelien,
>
> For 2D displays: What we do often is display multiple attributes  
> (layers) on one inline. On the base layer you can display a full  
> stack or similar seismic display so you will have a context. On the  
> higher layers you can display attributes such as your chimney. The  
> trick is for the higher layers to make part of the colorbar  
> transparent and/or make the layer as a whole transparent, such that  
> you can appreciate the context (seismic) and attribute in one view.  
> For convenience OpendTect has a default colorbar called chimney of  
> which the lower part is transparent. Below some links to the manual  
> entries that will enable you to do this.
> Manipulate lines (to add more layers): http://www2.opendtect.org/ 
> rel/html/x131.htm#AEN374
> Manipulate colorbar: http://www2.opendtect.org/rel/html/ 
> x131.htm#LINK-COLOR.EDIT
>
> For  interpretation of the chimney you can use multiple sections/ 
> slice in different directions which will give you a good feeling  
> about the 3D character and morphology of the chimney.
>
> For 3D displays: Load the data in a volume display element. Then  
> use the volume rendering option. The trick is to use a colorbar  
> which is 100% transparent for most of the range and only shows the  
> upper ~5% of the actual data range. This because in volume view the  
> (partial) transparent works similar to a fog, one can only see so  
> deep in the object and setting the cut-off to low would obliterate  
> the view on the core of the chimneys - often to get this exactly  
> right you need to play around a little bit with the color bar cut- 
> offs. Below the link to the manual entry regarding volume rendering:
> http://www2.opendtect.org/rel/html/x131.htm#AEN444
>
> I hope to this solves you question. If there is anything unclear  
> shoot me an email anytime.
>
> Cheers,
>
> -- 
> Friso GC Brouwer
> Chief Geophysicist
>
> dGB-USA
> One Sugar Creek Center Boulevard
> Suite 935
> Sugar Land, TX, 77478
>
> Tel 281 240-3939 (main)
> Tel 281 240-6957 (direct)
> Fax 281 240-3944
> e-mail friso.brouwer at dgb-group.com
> http://www.dgb-group.com
>
>
>
> Aurélien wrote:
>> Dear OD users,
>>
>> I did a Chimney cube using the standard procedure. So, it means  
>> that I have a very nice chimney :-)
>> But now, I would like to represent it in 3D as it looks like a  
>> very nice plume through sediments (see picture attached)
>>
>> There is several issues to do this:
>> 1) propagate something between the chimney and the non-chimney  
>> (user controlled) to get the enveloppe in 3D.
>> 2) remove all the data and/or values with a "chimney amplitude"  
>> lower than x (x= limit between chimney and non-chimney) and  
>> display the result.
>> 3) I don't know yet ;-)
>>
>> I didn't find any tool able to perform it in OD.
>>
>> Does anyboby knows how to ?
>>
>> Hope I am clear.
>>
>> Cheers,
>>
>> Aurelien Gay
>>  .     .
>>  o     o
>>   0     0
>>  0     0
>> __ 0____ 0___
>>  -     -
>>
>>
>> Geology and Geophysics Research Group
>> National Oceanography Centre
>> Empress Dock, Room 786/12
>> Southampton,  SO14 3ZH, UK
>> _____________
>> 38 rue Diderot
>> 66600 Rivesaltes
>> France
>> 0033 (0)4 68 50 66 96
>> _____________
>>
>>
>
>
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>

-- Geert de Bruin
-- Geoscientist
-- dGB Earth Sciences B.V.
-- Nijverheidstraat 11-2
-- 7511 JM Enschede, The Netherlands
-- geert.debruin at dgb-group.com
-- http://www.dgb-group.com
-- Tel: +31 534315155 , Fax: +31 534315104




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