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SE 313 – Computer Graphics SE 313 – Computer Graphics

SE 313 – Computer Graphics - PowerPoint Presentation

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SE 313 – Computer Graphics - PPT Presentation

Lecture 4 Represeting 3D Models Lecturer Gazihan Alankuş Please look at the last three slides for assignments marked with TODO 16022012 1 Quiz Turn off monitors Take out a piece of paper and a penpencil ID: 513936

texture 2012 project blender 2012 texture blender project elements model models geometrical week visual object part represented todo www

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Slide1

SE 313 – Computer Graphics

Lecture 4: Represeting 3D ModelsLecturer: Gazihan Alankuş

Please look at the last three slides for assignments (marked with TODO)

16.02.2012

1Slide2

Quiz

Turn off monitorsTake out a piece of paper and a pen/pencil5 minutes16.02.2012

2Slide3

Our Goal

Understand how 3D models are represented in computers. Supplement this knowledge with practice in Blender. 16.02.2012

3Slide4

3D Models

A 3D model encapsulates the geometrical and visual properties of an object in a virtual world. Can be used for rendering (taking a virtual photograph)Can be used for other purposes as well (collision detection, physics calculations, etc.)

16.02.20124Slide5

How are 3D Models Represented?

GeometryVisuals16.02.2012

5Slide6

Elements of a 3D Model

Geometrical elementsVerticesEdgesFacesNormals

Visual elementsMaterialsTexturesUV maps

16.02.2012

6Slide7

Geometrical Elements

VerticesEdgesFacesNormalsDemonstrations in Blender

16.02.2012

7Slide8

Geometrical Elements

VerticesEdgesFacesNormalsHow they are represented in Blender:

http://blenderscripting.blogspot.com/2011/05/blender-25-python-printing-vertex.html16.02.2012

8Slide9

Visual Elements

MaterialsTexturesUV mapsDemonstrations in Blender

16.02.20129Slide10

Visual Elements

MaterialsTexturesUV mapsHow to texture with UV maps in Blenderhttp://www.geeks3d.com/20090925/tutorial-discovering-blender-part-3-applying-uv-mapping

/https://www.youtube.com/watch?v=obB9T3jXlak16.02.2012

10Slide11

Basic Illumination

MaterialsLights NormalsRegular normalsUsing edges and the right hand rule

“Fake” normalsSmooth shading16.02.2012

11Slide12

Lab assignment

Part 1Start with a cube. Create a tower with three segments, like in the picture to

the right.Part 2Mark its seams appropriately and unwrap it so that it unwraps like the image to the right. (You can mark seam around the top square, and

vertically on each side. Then clear seam on one of the edges on the top)

Part 3

Draw a texture for it

in a creative way. Random

scribbles will

not be accepted. Show the texture in the

3D view as well as render the object with the texture on.

16.02.2012

12Slide13

Project Ideas

Creating 3D models of a gameAn interesting 3D problem that a game has and a solution to itA short movieAn interactive 3D experience in Unity requiring interesting calculations

16.02.201213Slide14

TODO:

ProjectsForm project groups of 2-3 people.Come up with a project ideaOne person in your group should send the list of students and a one-page project idea proposal

Send it to erdemokur@hotmail.com and cc it to gazihan.ieu@gmail.comUse the subject “SE 313 Project Group”Due November 2

nd (as next week is holiday)

16.02.2012

14Slide15

TODO:

Homework 4 (deliverable)Start with the first letter of your name that you created last week. (Ask for a letter model from the assistant if you did not submit last week’s homework)Unwrap it (re-watch the video on slide #10 if you get lost). The creases should be hidden as much as possible.

Choose one of these themes: fire, sea, grass, soilTexture it with the theme you chose. The model should give us the feeling of the chosen theme when we look at it. The texture should look continuous no matter how we turn the object. Majority of your grade will be on the quality of your texturing.The

texture should be visible in the 3D

view as well as

when the object is rendered.

Submit

the rendered image and the .blend file, just like you did last week

.

Due November 2

nd

(as next week is holiday

)

16.02.2012

15