Shaders, Textures and Maps:

Surface Properties/Material Attributes

• color
• transparency
• surface relief: bump/displacement/normal
• ambient color
• incandescence
• translucence
• diffusion
• specularity (size and distribution of highlight)
• reflectivity
• refractivity
• glow

These properties may be distributed throughout surface uniformly, as a uniform pattern, or non-uniformly.

Color

• brick color
• uniform brick wall pattern
• multiple uniform patterns
• non-uniform color pattern of a brick wall with graffiti

Transparency:

• even transparency
• uniform transparency pattern of a lattice
• non-uniform transparency
• is this transparent?

Relief: orange peel vs coin surface

Making Shaders in Maya

Hypershade : Window/Rendering Editors/ Hypershade
Materials: Lambert, Blinn, Phong

Procedural Texture is good for uniform patterns- pattern defined by Maya nodes based on an math algorythm

Image Texture ( Image Map, Bitmap Texture) is good for non-uniform patterns. It is based on a photo or drawing based sample (square image, usually 256x256 or 512x512 pixels)

Color Channels = Red Green Blue (RGB) - used for color, ambient, incandescent, normal maps, specularity
Transparency Channel = Alpha Channel (black and white) - used for transparency, bump, displacement

Texture Projections vs UV layout

NURBS: UV layout cannot be edited
Polygons: custom UV mapping is possible

Resources:

Introducing Maya 2009: Chapter 7
Help/Tutorials/Getting Started with Maya/Rendering/Lesson 2: Shading Surfaces
Help/Tutorials/Getting Started with Maya/Polygon Texturing/Lesson 1: UV texture mapping

Free Maya Shaders for Download:
http://www.highend3d.com/maya/downloads/shaders/page1.html?numi=350

Free Image Files for Textures:
Workspace/Applications/Total Textures CDs

Class Resources/Shaders folder: texturing.pdf -tips on designing realistic textures in

http://zarria.net/nrmphoto/nrmphoto.html -making of displacement and normal maps
http://www.pixologic.com/zbrush/gallery/ - examples of models made with Z-brush that rely on displacement to render surface detail

Generating Normal Maps in Maya:

http://www.youtube.com/watch?v=wYpbt-VaCJo - starting Maya 2009
http://www.youtube.com/watch?v=hANTXvM4V0M - in Maya versions before 2009

Project 2 is due Thursday November 12 at 10am

Examples of Animated Textures:
Y:\Courses\2009-2010\AC749_Berezina_AU09\Resources\Shading\shader_animations

Image Based Textures - keep them square, 256x256, 512x512 pixels for most purposes

Creating Tilable [Image] Textures - preparing textures to tile across the surface without visible seams using Photoshop

UV layout in UV Texture Editor
Dice exercise
Paint Tube exercise