David RunyonLauren Stana

Kelsey VaughnMolly

Shelestak

OVERVIEW• Procedural Texturing

• Perlin Noise

– Kenneth Perlin

– How to Obtain

– Hardware

• Other Procedural Textures

• Future

• Discussion Questions

WHAT IS A PROCEDURAL TEXTURE?

•Procedural Texturing

•What is…

•Advantages

•Disadvantages

•Implicit vs Explicit

•Perlin Noise

•Other Procedural Textures

•Future

•Discussion Questions

• Function of a set of input parameters

• Synthetic

ADVANTAGES OVER NON PROCEDURAL• Compact

• No fixed resolution

• Unlimited coverage

• Parameterize

•Procedural Texturing

•What is…

•Advantages

•Disadvantages

•Implicit vs Explicit

•Perlin Noise

•Other Procedural Textures

•Future

•Discussion Questions

DISADVANTAGES OF NON PROCEDURAL• Difficult to build and debug

• Surprising results

• Processing time

• Aliasing

• Not good for:– Labels– Pictures– Detail

•Procedural Texturing

•What is…

•Advantages

•Disadvantages

•Implicit vs Explicit

•Perlin Noise

•Other Procedural Textures

•Future

•Discussion Questions

IMPLICIT VS. EXPLICIT• Explicit Procedure

– directly generates the point– creates texture in a fixed order

• Implicit Procedure– answers a query about a point– creates texture in random order– used for creating natural

simulations (fire, clouds, fog, etc.)

•Procedural Texturing

•What is…

•Advantages

•Disadvantages

•Implicit vs Explicit

•Perlin Noise

•Other Procedural Textures

•Future

•Discussion Questions

KENNETH PERLIN• Technical Achievement Award

• TRON

• Hardware Limitations

• Controlled Random Primitive

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain

•Hardware

•Other Procedural Textures

•Future

•Discussion Questions

NOISE• White Noise

• Pseudo-Random

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain•Noise

•Ideal Noise

•Lattice

•Octaves

•Smoothing

•Combining

•Hardware

•Other Procedural Textures

•Future

IDEAL NOISE FUNCTION• Repeatable function

• Known range

• Doesn’t exhibit patterns

• Stationary

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain•Noise

•Ideal Noise

•Lattice

•Octaves

•Smoothing

•Combining

•Hardware

•Other Procedural Textures

•Future

• Stationary example

LATTICE• Most popular

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain•Noise

•Ideal Noise

•Lattice

•Octaves

•Smoothing

•Combining

•Hardware

•Other Procedural Textures

•Future

OCTAVES• Lucunarity

• Gain

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain•Noise

•Ideal Noise

•Lattice

•Octaves

•Smoothing

•Combining

•Hardware

•Other Procedural Textures

•Future

SMOOTHING•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain•Noise

•Ideal Noise

•Lattice

•Octaves

•Smoothing

•Combining

•Hardware

•Other Procedural Textures

•Future

COMBINING• Fractional Brownian Motion

– Noise(p) + ½ * Noise(2*p) + ¼ * Noise(4 * p) + …

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain•Noise

•Ideal Noise

•Lattice

•Octaves

•Smoothing

•Combining

•Hardware

•Other Procedural Textures

•Future

HARDWARE• Graphic Processing Unit

• How it works1. Graphics processor renders colors

2. Colors store the state of the simulation

3. Colors read back in

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain

•Hardware

•Other Procedural Textures

•Future

•Discussion Questions

Blue = 1D positionGreen = VelocityRed = ForceRGB1 = 3d positionRGB2 = 3d velocity

HARDWARE• Keep it all on the GPU!

• Geometry drives processing

• Pixel shaders

•Procedural Texturing

•Perlin Noise

•Kenneth Perlin

•How to Obtain

•Hardware

•Other Procedural Textures

•Future

•Discussion Questions

WHY???

WATER SIMULATION• Video/PC Games

• Coupling two simulations

•Procedural Texturing

•Perlin Noise

•Usage of Procedural Textures

•Water Simulation

•Terrains

•HyperTexturing

•Animation

•Future

•Discussion Questions

TERRAINS• Height Map

•Procedural Texturing

•Perlin Noise

•Usage of Procedural Textures

•Water Simulation

•Terrains

•HyperTexturing

•Animation

•Future

•Discussion Questions

HYPERTEXTURING• Density cloud

•Procedural Texturing

•Perlin Noise

•Usage of Procedural Textures

•Water Simulation

•Terrains

•HyperTexturing

•Animation

•Future

•Discussion Questions

ANIMATION• Facial Subtleties

•Procedural Texturing

•Perlin Noise

•Usage of Procedural Textures

•Water Simulation

•Terrains

•HyperTexturing

•AnimationAnimation

•Future

•Discussion Questions

FUTURE• Faster

• More Complex Simulations

• Animation

• Applications

•Procedural Texturing

•Perlin Noise

•Other Procedural Textures

•Future

•Discussion Questions

DISCUSSION QUESTIONS1) Should you be able to copyright procedural

equations?

2) Will graphical languages like OpenGL or DirectX implement common procedural textures such as clouds, fire, etc in their API?

3) In the future, will there be a program enabling users to scan a picture of a texture and have the computer create a matching procedural texture?

4) What are some ways the procedural texturing can be made easier in 3d graphics programs like Maya?

5) Will a video game ever strictly use procedural textures?

•Procedural Texturing

•Perlin Noise

•Other Procedural Textures

•Future

•Discussion Questions

David RunyonLauren Stana

Kelsey VaughnMolly

Shelestak