VRML II Part 2

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VRML II - Part 2

• Color and Texture

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Overview

• Customizing the color of shapes using the
  Appearance and Material nodes
• Mixing red , green, blue light
• Creating dull, shiny, glowing, and transparent
  surfaces
• Wrapping images around shapes using the Texture
  node (Andi)
• Texture mapping with images, movies, and raw
  pixel data (Andi)
• Using the texture node to control texture mapping
• (Andi)

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Appearance of a shape
You can change the appearance of a shape by using
three nodes. Appearance exposedField SFNode
material NULL exposedField SFNode
texture NULL exposedField
SFNode textureTransform NULL
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Material Node
Material exposedField SFColor diffuseColor
0.8 0.8 0.8 0,1 exposedField SFFloat
ambientIntensity 0.2 0,1 exposedField
SFColor emissiveColor 0 0 0
0,1 exposedField SFFloat shininess 0.2
0,1 exposedField SFColor specularColor
0 0 0 0,1 exposedField SFFloat
transparency 0 0,1
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Material Node Diffuse Color

• Material
• exposedField SFColor diffuseColor 0.8 0.8 0.8
  0,1 R G B
• The diffuse color field sets the basic color for
  an object
• It accepts 3 floating point values which are
  based on the RGB color model

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Red - Green - Blue Color
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Example Diffuse Color VRML V2.0 utf8 Shape
appearance Appearance material Material
diffuseColor 0 1 0 geometry Cone
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Material Node Ambient Intensity

• Material
• exposedField SFFloat ambientIntensity 0.2
  0,1
• It is used to control how much or how little
  light is reflected by the surface of a shape

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Shiny Surface

• Material
• exposedField SFColor specularColor 0 0
  0 0, 1
• exposedField SFFloat shininess 0.2
  0, 1
• The specularColor Field is to alter the surface
  properties of a shape based on specular
  reflection, meaning that light will be reflected
  in a specific direction
• The shininess Field defines the size of specular
  reflection. Low values --gt shiny appearance
• High values --gt dull appearance

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Metal, Plastic, and Glass Surface

• By combining the Material nodes diffuse color,
  specular color and Shininess fields in various
  ways you can create metallic, plastic, and glass
  surfaces.

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VRML V2.0 utf8 Shape appearance Appearance
material Material diffuseColor 0.37 0.37
0.37 specularColor 0.89 0.89 0.13 shininess
0.13 geometry Cone
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Material Node Glowing Colors
Material exposedField SFColor emissiveColor
0.8 0.8 0.8 0, 1

• It accepts three floating point numbers to
  describe the RGB color model.
• 0 is used to specify no glowing light for a given
  color while 1 specifies the highest possible
  amount.

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Example 1.Diffuse Color VRML V2.0 utf8 Shape
appearance Appearance material Material
diffuseColor 1 1 0 geometry Sphere
Presentation
2.emissiveColor VRML V2.0 utf8 Shape
appearance Appearance material Material
emissiveColor 1 1 0 geometry Sphere
Presentation
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Material Field Transparency

• Material
• exposedField SFFloat transparency 0
  0, 1
• Values closer to 1 introduce more transparency to
  a shape by allowing more light through it, while
  a value of 1 creates shapes that are completly
  transparent.

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Example VRML V2.0 utf8 Transform translation
0 0 4 children Shape appearance Appearance
material Material diffuseColor 0 1
0 transparency 0.75 geometry Cone
Shape appearance Appearance material Material
diffuseColor 1 1 1 geometry Cylinder
Example