twisted ribbon/object

[Anonymous]

Hello-
Please show me how this (attached) is done using GDL, I have posted this in 'Working in AC' section. I got a suggestion to bring it here. I have tried the mesh tool before, but didnt work. I would also like to know if I can manipulate/play with the surface of this object after creating it.
Please disregard materials.

[Aussie John]

coons is a mystery to me

[Anonymous]

You can try the internationally famous 'Efes Pilsen' brand !

I've started a new thread over at Coons 101. Please make contributions to the usual PayPal account.

- Stuart 'just pleased for an excuse to get his post no.s up' James

[Anonymous]

shukran all,

Stuart I'm trying to model a complex sculpture in which the twisted shape is only a part of it. When I finish it sometime I will post it.

thanks again

[Ignacio Azpiazu]

Karl wrote:
Or tell us which beer!

It is definitely not the beer. Stuart's profile portrait leaves no doubt as to the fact that he was born for these helical stuff things.

[Dwight]

Let me add my admiration.
This is ballet.

[Anonymous]

StuartJames wrote:
Geometric shapes are very easy in GDL. It is architecture that is difficult The GDL is actually quite simple - but a geometric background does help.

HTH !
Stuart 'prefers long variable names' James


!*** master variables ***

oRevolutions = 2
oSegmentAngle = 5 !=== in degrees
oCoilRadius = 5
oCoilLength = 50
oBandWidth = 5
oBandHeight = 2

!*** dependent variables ***

oAngle = 360 * oRevolutions
oStep = oAngle / (360/oSegmentAngle)
oXmultiplier = oCoilLength / oAngle

!*** put path ***

for i = 0 - oStep to oAngle + oStep step oStep

oX = i * oXmultiplier
oY = sin (i) * oCoilRadius
oZ = cos (i) * oCoilRadius
put oX, oY, oZ, i
next i

!*** draw path ***

tube 4, oAngle/oStep +2, 32+16+2+1,
-oBandWidth*0.5, -oBandHeight*0.5, 0,
oBandWidth*0.5, -oBandHeight*0.5, 0,
oBandWidth*0.5, oBandHeight*0.5, 0,
-oBandWidth*0.5, oBandHeight*0.5, 0,
get ((oAngle/oStep+2)*4)

end

hello, i'm newbie
a question:

and if the path of the ribbon is not straight but it's a circumference and the diameter of the imaginary "tube" (the diameter's size of the ribbon) is not constant but it decrease gradually (the ribbon grow and grow), how should I modify the code?

tnx