[GEM-dev] more new primitive for gem...

[Cyrille Henry]

B. Bogart wrote:

>Hi Cyrille,
>
>What I'm making right now as an abstraction made out of 6 of your curve
>surfaces, each representing a face of a cube. Of course thic cube can be
>deformed to become a curve, but the edges between faces will always be 90
>degrees. (hard edge)
>
ok.

>So is there the possibility of having an enclosed shape (like the cube
>example above, where there is an intererior and an exterior that are
>non-continuous. A torus, cone, sphere, cube are all enclosed. A plane, your
>curve, and circle are not enclosed because they have only one surface (no
>interior).
>  
>
yes, it's possible with the curent version of curve3D to do enclosed shape.
for a 5 5 control matrix of the curve3D object if :
control[0][i]=0,0
control[4][i]=0,0
control[i][0]=0,0
control[i][4]=0,0

the curve will then be an enclosed shape.
(0,0 will be part of the curve)
the shape will depend of the other control points.

>A blob would be different than the above example because it would not have
>any hard edges. A bubble is a blob... Basically I'm asking for a sphere
>primitive that you can move control points to destort the surface.
>
a sphere can also be done with the curve3D object using this :

with the 5 5 control matrix :
control[0][i] = circle diamettre = 0, heigh = 0
control[1][i] = circle diamettre = 0.7, heigh = 0.3
control[2][i] = circle diamettre = 1, heigh = 0.5
control[3][i] = circle diamettre = 0.7, heigh = 0.8
control[4][i] = circle diamettre = 0, heigh = 1

(it's possible with 5 points to draw a circle)
value are only aproximations
exact value can be found on internet...

I may not be very clear???


and yes, hard angles can be done using more than 1 curve3d, but I don't
know how to assume that all angle will alway be 90°.


>I'm CCing on the gem-dev so perhaps someone with better french can explain
>what I'm talking about.
>
I hope I understant this time.


I like the idee of the blob or other enclosed shape  but I don't know
(understand) how to control it in a better way than what's is curently
possible...
any idee of what I'm missing?



I made a patch of enclosed shape with curve3d : you may find pict
(new_tentacle) here :

http://drpichon.free.fr/pure-data/GEM/curve3D/

cyrille

>Thanks for the good work.
>
>Ben
>
>----- Original Message -----
>From: "Cyrille Henry" <cyrille.henry at la-kitchen.fr>
>To: "B. Bogart" <ben at ekran.org>
>Sent: Tuesday, October 28, 2003 8:14 AM
>Subject: Re: [GEM-dev] more new primitive for gem...
>
>
>  
>
>>Hello Ben,
>>
>>I'm not sure to understand everything.
>>(still nead to progresse in english.)
>>google does not have a good translation...
>>
>>what's an "enclosed curvy shape"?
>>
>>what's a blob?
>>
>>cyrille
>>
>>B. Bogart wrote:
>>
>>    
>>
>>>Hey Cyrille,
>>>
>>>I'm just patching up an abstraction for an enclosed curvy shape. But as I
>>>mess around I realize it would make much more sense as an external. Are
>>>there any plans for an enclosed version of curve3d? (which would be
>>>basically like a blob) I'd really like this...
>>>
>>>      
>>>
>>thank's
>>
>>    
>>
>>>Thanks again for the good work.
>>>
>>>
>>>      
>>>
>>well, I just copy my open GL book!
>>
>>
>>Ben ----- Original Message ----- From: "Cyrille Henry"
>><cyrille.henry at la-kitchen.fr> To: <gem-dev at iem.kug.ac.at>
>>
>>    
>>
>>>Sent: Monday, October 27, 2003 4:42 PM
>>>Subject: [GEM-dev] more new primitive for gem...
>>>
>>>
>>>
>>>
>>>      
>>>
>>>>hello,
>>>>
>>>>I made a new primitive for gem : curve3D....
>>>>juste like curve, but in 3D!
>>>>
>>>>you may find stuff here :
>>>>
>>>>http://drpichon.free.fr/pure-data/GEM/curve3D/
>>>>
>>>>picts, source, exemple and gem.dll for windows user...
>>>>
>>>>hope you'll like it...
>>>>
>>>>
>>>>Cyrille
>>>>
>>>>
>>>>
>>>>
>>>>_______________________________________________
>>>>GEM-dev mailing list
>>>>GEM-dev at iem.at
>>>>http://iem.at/cgi-bin/mailman/listinfo/gem-dev
>>>>
>>>>
>>>>        
>>>>
>>>
>>>
>>>      
>>>
>>    
>>
>
>
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>  
>