NurbsLathe for 2.127

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NurbsLathe for 2.127

Postby thyme » 10 Dec 2007, 12:27

Open Source Seamless3d 2.127 (including French and English versions) is available for download from:

http://www.seamless3d.com/download


A new specialised build node, the NurbsLathe Image has been added for 2.127.
To see this node in action just create a new smls file, select the part node and click on the NurbsLathe Image icon in the main (horizontal) toolbar.
Like the BezierLatheBuild Image the NurbsLathe Image node is dead simple to use even if you have never used Seamless3d before.
Like the BezierLathe you simply drag the control points in only 2 dimensions to create a curved shape.
To insert a new control point after the selected control point, increment the point's length field.
To delete the selected control point decrement the point's length field.
The NurbsLathe not only offers instant gratification for beginners it is also good for setting up a NurbsPatch Image
To convert a NurbsLathe Image to a NurbsPatch Image right click on the NurbsLathe icon in the scene tree and select "convert to patch".
The shape will be exactly the same as when it was a lathe but a patch allows us to carry on making a more advanced shape than is possible from a lathe.
The prismSides field is only used for converting to a patch, it specifies the number of flat sides for the patch's control prism.
Unlike the BezierLathe node there is no fix field for creating a new segment because Nurbs only need one segment due to the fact that the control points only affect the curve near by.
I have much better understanding in how beziers compare to Nurbs now that a little over a year has passed since I added the first BezierLathe to seamless.
I remember being a little confused by which was easier to control, Beziers or Nurbs.
This depends on the task.
Nurbs are easier in the sense that the control points are closer to the curve they affect and because you can add more control points without them affecting all of the curve but because the control points for a Bezier influence the entire curve with in a segment they are easier to control than Nurbs to make a smooth curve when the curve is within a segment and when the curve does not need to curve in and out more than a small number of times.
Beziers are great for making perfect continuous "sexy" curves but soon as you need a new segment in order to make a more complex curve all the virtue of using a Bezier is lost leaving Nurbs with more attractive properties.
Even with the tangent being matched between the 2 Bezier segments, the human eye can typically see where one curve comes to an end and where a new one begins at the exact point where the 2 segments join. This is because the control points between the 2 segments are completely isolated from each other where as with Nurbs, although the control points only affect the curve locally there is always an overlapping influence from a number of control points at any point within the curve and so the human eye can not detect a single point where one lot of control points begin and where another lot end.

In comparing Nurbs to Beziers confusion can arise from the fact that Nurbs can be set up to generate Bezier curves with the same strengths and weakness Beziers have that I have just described.
In comparing Nurbs to Beziers I am referring to Nurbs where they are set to have the control points only affect the curve locally which is how Nurbs are most often used.

A bug that caused unexpected behaviour when dragging the control points for the BezierLathe when the scale field was not set to the default value has been found and fixed for 2.127 as well as some other bugs unrelated to the NurbsLathe.

Many thanks to the program White Dune which was a great help to me when experimenting with Nurbs and many thanks to MUFTI one of the White Dune programmers who suggested I try White Dune:)
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Postby Lilly » 10 Dec 2007, 14:51

thank much thyme
je vais expérimenter cette nouvelle version !
bisous
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Postby thyme » 10 Dec 2007, 20:33

Thanks Lilly :P
Looking at all the wonderful creations you have made using the Bezier Lathe I eagerly await to see your talent being applied to the new NurbsLathe :D
bisous
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Postby Lilly » 11 Dec 2007, 20:57

yes thymou but i have made a pinguin yesterday with this ;o)
Image

please check your email for this pinguin thyme

bisousss
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Postby thyme » 13 Dec 2007, 19:03

Hi Lilly :)
Lovely penguin! featureing a textured NurbsPatch :P
I am working on the next version which I hope will be ready in a matter of days, it will allow SphereBuilds, CylinderBuilds, ConeBuilds, TorusBuild, BoxBuild and BezierLatheBuilds (as well as NurbsLathes which it already does) to be converted to NurbsPatches without changing the shape.
Because the NurbsPatch lets you add a TextureMapper most if not all of your models should be able to have textures applied.
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Postby Lilly » 14 Dec 2007, 20:11

wow thanks thyme it's great !
hugzzzz
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Re: NurbsLathe for 2.127

Postby Alain » 20 Dec 2007, 07:31

hello new board :)

ah !
I was a bit lost with the colorSweep ,
by I typed in google

colorsweep thyme

and I get that LOL

Posted: Tue Feb 13, 2007 6:30 pm Post


To specify the top colour set the index field to 1 first before you change the color field

index 0 controls bottom color
index 1 controls top color



so my first attempt

http://dumenieu.free.fr/louizeforum/seamless/fleur.wrl

and my second

http://dumenieu.free.fr/louizeforum/seamless/fleur2.wrl


I do like the degradés , I will continue to try :)


I had that too

it is just to test the colors

http://dumenieu.free.fr/louizeforum/seamless/herbes.wrl

it is just to test the colors with texture



http://dumenieu.free.fr/louizeforum/sea ... etnoel.wrl

it is just to test the colors too ,

http://dumenieu.free.fr/louizeforum/sea ... menoel.wrl

http://dumenieu.free.fr/louizeforum/seamless/fraise.wrl

http://dumenieu.free.fr/louizeforum/sea ... enoix2.wrl
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Re: NurbsLathe for 2.127

Postby thyme » 20 Dec 2007, 15:59

I was amazed to see your 2 flowers just before I converted the forum to version 3 Alain, they are beautiful :P
And thanks for the visual feedback for the new NurbsLathe too :)
Sorry because they were posted at this critical time they were lost so thanks for reposting them to the new board :)
Do you have the "straight" field checked in the ColorSweep Alain? it is essential this (or the "spherical" field if you want to do spherical colour sweeping) be checked Alain.
Not having this field checked would often catch Ep out I remember when she used it to make her worlds back in 2003 and I forget to check it myself so I will make this checked by default when you add a ColorSweep for the next version.
I will also make the new version have a visual clue to show where the colour points are located for the sweep.
It would probably be ready by now if it were not for all my time being spent converting the forum over the last few days :(

I have just clicked on your first new link:

http://dumenieu.free.fr/louizeforum/seamless/herbes.wrl

What a wonderful surprise Alain !!!
The swaying green stems look absolutely wonderful and so too are the colours you used :)
I can feel a lovely calming effect come over me from looking at this world Alain, it makes you feel like you is meditating :P I love it :mrgreen:
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Re: NurbsLathe for 2.127

Postby Alain » 20 Dec 2007, 16:42

Do you have the "straight" field checked in the ColorSweep Alain? it is essential this (or the "spherical" field if you want to do spherical colour sweeping) be checked Alain.


ah ????

humm I don"t know LOL ,
I will take a look more ,
I am on holidays soon :)

hey , you know what , Thyme , the new forum seems very faster !
( to be loaded , I mean )
congrats
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Re: NurbsLathe for 2.127

Postby Alain » 22 Dec 2007, 08:10

ah ok I saw that now , ok ok , thanx ! :)
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Re: NurbsLathe for 2.127

Postby thyme » 29 Dec 2007, 20:29

Sorry Alain I realise now you were referring to the ColorSweep you get as a result of converting a NurbsLathe to a NurbsPatch which will always result in the ColorSweep automatically having it's straight field checked.

Before Christmas I made it so that the ColorSweep now has control points that can be dragged to change the positions of the colours but work on this new version has stalled a bit over Christmas time so we can all thank the spammers for being denied the new version before Christmas, :x lol.

Ever since you posted your flowers Alain I was curios about how you made them and wanted to ask if you formed the petals using a NurbsPatch (as a result of converting the NurbsLathe to a patch) but then I guessed knowing how much you like the radial tug you used a radial tug (after the white part is converted to a blue part) but later again I noticed on the Louize forum:

http://closed.forumactif.com/worlds-vrm ... 27-360.htm

you were converting the lathes to patches so now I will ask my question :)

did you make the petals by dragging on the NurbsPatch's control points Alain? or was this done using a radial tug?
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Re: NurbsLathe for 2.127

Postby Alain » 29 Dec 2007, 20:49

I do like the radial stuff !!

and I wanted to ask you , since ages LOL

( or may be I did ?? scuse my alzheimer :(

could we have a tool to increase the radial tug ,
and decrease it ?

with a number I mean , because it is long to wait it increases ,
just by clicking on the plus or minus

:))

yes I do like to bore you :)
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Re: NurbsLathe for 2.127

Postby thyme » 29 Dec 2007, 21:09

thanks for your feedback Alain :) I am sure I can do something to make it so you can enter numbers directly and/or speed up the incrementing/decrementing for the radial tug's radius value.
I will think about this subject today and will ask bumpy while he is here down on the farm if he has any good ideas in regard to adding such a feature :)

But you did not answer my question Alain lol
did you use the NurbsPatch control points or the radial tug to make your flowers?

you wont get into trouble what ever answer you give (unless you say you did this using 3d studio max, then you be in lots of trouble), I am just curious to know :mrgreen:
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Re: NurbsLathe for 2.127

Postby thyme » 30 Dec 2007, 12:40

Thanks for the flash movie tutorial Alain, looks good :) Sorry that you were not able to imbed your flash movie here into the forum. I have read phpBB3 does not allow one to imbed html (for security reason I guess) but as you can see phpBB3 has a flash button to allow the user to imbed flash and as far as I know it can be set up to allow one to imbed YouTube movies and other simular things but I have so far failed to be able to get any flash movies imbedded here :(
I wonder now if the reason before we were not able to embed any movies on my previous phpBB2 was because of some setting related to my server and now the same issue perhaps is preventing us from imbedding flash. Anyone who knows about this stuff please enlighten us :)
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