3D Kuliah M #3

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RG091593 3D MODELLING

RG091593 3D MODELLINGProgram Studi TeknikGeomatika

FTSP - ITS

Agung B. CahyonoDepartment of Geomatic Engineering

KULIAH M # 3 : Representasi 3D

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MODEL 3D

3D models represent a 3D object using a

collection of points in 3D space,connectedby

various geometric entities such as triangles,

lines,curvedsurfaces,etc.

Being a collection of data (points and otherinformation), 3D models can be created by

hand, algorithmically (procedural modeling),

or scanned.

26 February 2014 Agung B. Cahyono 2

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PENGERTIAN

Karenapenampilansuatuobjek

tergantungpadaobjekluar, maka

dibuat batasatau yang disebut

REPRESENTASI.Representasiinilah yang umum

ditampilkankomputergrafis.


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Representasi Model 3D

* Solid - Model-model ini menentukanvolume objek yang mereka wakili (sepertibatu).

-Model ini tampak lebih realistis.

-Rumit dan perlu waktu lama.

-Model ini banyak digunakan untuk simulasinonvisual seperti medis dan teknik simulasi,CAD dan khusus untuk aplikasi visual sepertigeometri solid


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* Shell / batas - model ini mewakili

permukaan, misalnya batas dari objek,

bukan volume (seperti kulit telur yang

amat sangat tipis).

- Model ini lebih mudah untuk bekerja

dengan daripada model padat. Hampir

semua model visual digunakan dalam shell

model.


Representasi Model 3D

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REPRESENTASI

Dua dimensi permukaan merupakan

analogi yang baik untuk objek yang

digunakan dalam grafik.

Karena permukaan tidak terbatas,

sebuah pendekatan digital diskrit

diperlukan: poligonal jala-jala sejauh ini

representasi paling umum.

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Proses transformasi representasi

objek, seperti koordinat titik

tengah sebuah bola dan sebuah

titik pada lingkar menjadi

representasi poligon sebuah bola,

disebuttessellation.

REPRESENTASI

Tessellation adalah proses menciptakanbidang dua dimensi dengan menggunakanpengulangan bentuk geometris tanpatumpang tindih dan tidak ada kesenjangan.

Tessellations ditemukan oleh M. C. Escher,

ketika mempelajari seni Moorish (Granada,Andalusia, Spain) pada tahun 1922.

Tessellations terlihat sepanjang sejarah seni,dari arsitektur kuno untuk seni modern.


REPRESENTASI

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http://en.wikipedia.org/wiki/Tessellation

Incomputergraphics, tessellation is used

to manage datasets of polygons and

divide them into suitable structures

for rendering. Especially for real-time

rendering, data are tessellated intotriangles, for example in DirectX

11andOpenGL.


REPRESENTASI
http://en.wikipedia.org/wiki/Computer_graphicshttp://en.wikipedia.org/wiki/Computer_graphicshttp://en.wikipedia.org/wiki/Rendering_(computer_graphics)http://en.wikipedia.org/wiki/Polygon_triangulationhttp://en.wikipedia.org/wiki/Polygon_triangulationhttp://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/OpenGLhttp://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/OpenGLhttp://en.wikipedia.org/wiki/DirectX_11http://en.wikipedia.org/wiki/Polygon_triangulationhttp://en.wikipedia.org/wiki/Rendering_(computer_graphics)http://en.wikipedia.org/wiki/Computer_graphics

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http://en.wikipedia.org/wiki/Tessellation

Dalam desain dibantu komputer desain dibangundiwakili oleh model representasi batas topologi,di mana permukaan 3D analitis dan kurva,terbatas pada wajah dan tepi merupakan batasterus menerus dari model 3D.

Badan 3D sering terlalu rumit untuk menganalisis

secara langsung. Jadi mereka didekati(tessellated) dengan lubang kecil, agar mudahmenganalisis potongan hexahedra 3D volumebiasanya baik teratur tetrahedral, atau tidakteratur.


REPRESENTASI

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A polygon mesh is a collection of vertices,

edges and faces that defines the shape of

a polyhedral object in 3D computer

graphicsandsolid modeling. The faces usually

consist of triangles, quadrilaterals or other

simple convex polygons, since this

simplifies rendering, but may also be

composed of more general concave polygons,

or polygons with holes.


REPRESENTASI


REPRESENTASI
http://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/Solid_modelinghttp://en.wikipedia.org/wiki/Solid_modelinghttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/Trianglehttp://en.wikipedia.org/wiki/Quadrilateralhttp://en.wikipedia.org/wiki/Convex_polygonhttp://en.wikipedia.org/wiki/Convex_polygonhttp://en.wikipedia.org/wiki/Rendering_(computer_graphics)http://en.wikipedia.org/wiki/Rendering_(computer_graphics)http://en.wikipedia.org/wiki/Convex_polygonhttp://en.wikipedia.org/wiki/Quadrilateralhttp://en.wikipedia.org/wiki/Trianglehttp://en.wikipedia.org/wiki/Solid_modelinghttp://en.wikipedia.org/wiki/3D_computer_graphicshttp://en.wikipedia.org/wiki/Polyhedron

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Jala-jala segitiga (seperti bujur sangkar)

yang populer karena terbukti mudah

untuk membuat menggunakan scanline

render.

Polygon juga merupakan contoh

representasi namun tidak digunakan

dalam semua teknik rendering.


REPRESENTASI


ELEMEN MESH

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A vertex is a position along with other information such as

color, normal vector and texture coordinates. An edge is a

connection between two vertices.

A face is a closed set of edges, in which a triangle facehas

three edges, and aquad facehas four edges.

Apolygonis a set of faces. In systems that support multi-sided

faces, polygons and faces are equivalent. However, most

rendering hardware supports only 3- or 4-sided faces, so

polygons are represented as multiple faces.

Mathematically a polygonal mesh may be considered

an unstructured grid, or undirected graph, with additional

properties of geometry, shape and topology.


ELEMEN MESH
http://en.wikipedia.org/wiki/Unstructured_gridhttp://en.wikipedia.org/wiki/Unstructured_grid

3D Kuliah M #3

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