CarStyling Special Edition


Deforming models using Universal Deformation Technology(UDT)

Atsuo Nakajima AppliCraft Co., Ltd

I would like to show the example of more organic shape modeling not Automotive styling Here I use "Crucian carp(kind of Freshwater fish)" as a example.
The creature like this fish is required much information to express its shape with digital modeling comparing with Inorganic substance like an industrial products.
Computer graphics uses texture mapping and material definition to make them show realistic.
I try to express the organic creature with 3D digital modeling as possible.


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Whole shape of "Crucian carp"
The reader of “Rhino 3D” could easily model regarding the body and head.
You may just create 3D wire frame curves and then create surfaces like a body of car.
You can use "Organic form modeling" manner also.


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Probably fines is difficult if we try modeling this with typical manner we must spend a lot of time.
Then I would like to show UDT(Universal deformation Technology), which is the new functionality of Rhino 4.0.


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Here I explain UDT modeling with tale fin modeling as an example.
AT first I draw 2 dimensional shape of tale fin based on 4 edges.
Then create planar surface from those 4 edges, you can use "EdgeSurf command" or "NetWorkSrf command".

Next prepare rectangle planar surface.
I will use "FlowalongSrf command" of UDT later, here I call rectangle planar surface as "Base surface" and planar surface of tale fine shape as a "Target surface".


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Prepare surface like bellows shape. This surface must have same boundary shape of "Base surface".
Probably root of tale fine is thicker and edge must be linear shape.

Create section curves of root and define edge as a line, you may define other section curves as you like.
Then create surface of bellows shape with using "EdgeSurf command" or "NetWorkSrf command".


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Then execute "FlowalongSrf command(used to be "Sporph")", select surface of bellows then select "Base Surface", then select "Target surface". Now you have a "tale fin" by deforming "rectangle bellows".


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You can create other fins with same manner.


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Once you created “Crucian Carp”, you can deforming the whole shape, then you will receive goldfish 1(Wa-Kin) and goldfish 2(ryu-kin)


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You can create like "Lump" with UDT.
Here I would like to use one technique to express the material of glass.
Usually glassware by craft does not have same thickness, then it has "Fluctuation"
Regarding reflection and refraction.
To give this kind of fluctuation for rotational object, then I tried to shift the position of "all control points" which define the surface shape. Then I could have expression of fluctuation.
Here use "FlowalongSrf command" as "Crucian carp"


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If control points of surface is arrayed regularly or uniformly located, we cannot show the expression of fluctuation, then I intentionally deform or fluctuate the shape by shifting the position of control points.
You can use, "PDQ tool", shifting control points first, then deform by UDT and have model with expression of fluctuation.
(Note; PDQ tools only work on Rhino 3.0. 2006/7/10)


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You can use "Twist command", another UDT command, then receive final model.
(Rendered with Flamingo 1.1)

Some time, shape defined by mathematical expression is too cold. Then deform or fluctuate the shape intentionally gives us more way of expression.



If you are interested in those model, you can download model including the example of cell phone, which described at "Rhino3D modeling"



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