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Local and Global Illumination Models

Local and Global Illumination Models

Explore the nuances of local and global illumination models in computer graphics. Consider light source models, including distant point sources and area sources. Learn how factors like surface orientation, material, and shadows affect pixel brightness.

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Quiz20 Questions
Flashcards12 Cards
Study Notes1 Note

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Local and Global Illumination Models

Quiz • 20 Questions

Local and Global Illumination Models - Flashcards

Flashcards • 12 Cards

Study Notes

2 min • Summary

Materials

List of Questions20 questions
  1. Question 1
    • Area source
    • Distant point source
    • Global illumination
    • Ambient light
  2. Question 2
    • Surface orientation
    • Light source strength and color
    • Surface material and albedo
    • Sensor temperature
  3. Question 3
    • Albedo
    • Specular exponent
    • Diffuse coefficient
    • Reflectance
  4. Question 4
    • Absolute color values
    • Ambient temperature
    • Precise light source locations
    • Changes in surface normal
  5. Question 5
    • The process of maintaining uniform color distribution across an image through histogram equalization.
    • The phenomenon where a color sensor's response remains consistent over time.
    • The ability to perceive the 'true color' (albedo) of a surface despite variations in illumination.
    • The physical property of a material to reflect the same wavelengths of light regardless of the incident light source.
  6. Question 6
    • Computers lack the contextual understanding and adaptive mechanisms that humans possess.
    • Computers can perfectly calibrate color sensors, eliminating errors.
    • Computers have a higher dynamic range for color detection.
    • Computers are generally more sensitive to subtle variations in lighting.
  7. Question 7
    • All colors in the image should average out to white.
    • The image was captured under ideal lighting conditions, so no correction is required.
    • White surfaces reflect all wavelengths of light equally.
    • The brightest pixel in the image should correspond to a white surface.
  8. Question 8
    • Adjusting color channels so the average color in the image becomes gray.
    • Simulating a monochromatic camera by converting the image to grayscale.
    • Correcting for vignetting by assuming the corners of the image are gray.
    • Ensuring all colors are desaturated, making the image grayscale.
  9. Question 9
    • Gamma correction
    • Color channel swapping
    • White balancing
    • Histogram equalization
  10. Question 10
    • Local models only account for light directly from sources, while global models include inter-reflections.
    • Local models calculate brightness per vertex, while global models calculate brightness per pixel.
    • Local models are used for real-time rendering, while global models are only used in offline applications.
    • Local models only consider light sources, while global models simulate the entire electromagnetic spectrum.
  11. Question 11
    • Distant point source
    • Global illumination
    • Ambient light
    • Area source
  12. Question 12
    • A laser pointer
    • A point light bulb in a dark room
    • A white wall acting as a reflector
    • The sun on a clear day
  13. Question 13
    • Bilateral filtering
    • Histogram equalization
    • White balancing
    • Alpha blending
  14. Question 14
    • Closer surfaces can reflect more light, leading to higher intensity.
    • Proximity has no direct impact on intensity; it only affects focus.
    • Closer surfaces always appear brighter due to decreased atmospheric scattering.
    • Closer surfaces always appear darker due to increased shadowing.
  15. Question 15
    • To adjust colors to represent the 'true color' of surfaces.
    • To increase the image resolution.
    • To add artistic filters for aesthetic appeal.
    • To compress the image file size.
  16. Question 16
    • Set the average of each color to be equal.
    • Adjust each color channel according to its average compared to the average of all channels.
    • Make sure the maximum RGB value is the same.
    • Set each pixel to be gray.
  17. Question 17
    • Area soruce
    • Global illumination
    • Ambient light
    • Distant point source
  18. Question 18
    • Inter-reflection
    • White Balancing
    • White World Assumption
    • Gray World Assumption
  19. Question 19
    • The smoothness of light
    • The color of any shadows
    • The direction of light that is reflected
    • The amount of light that a surface reflects
  20. Question 20
    • Local Illumination Model
    • Area Source
    • Point Source
    • Global Illiumination Source
List of Flashcards12 flashcards
  1. Card 1
    HintThink of light bouncing around a room.Memory TipImagine light as a ball bouncing between mirrors.
  2. Card 2
    HintThink of the sun.Memory TipSun: far away and gives light in one direction.
  3. Card 3
    HintA diffused light source that doesn't come from one single point.Memory TipArea source: like a softbox in photography providing diffused light.
  4. Card 4
    HintBase level lighting.Memory TipImagine a minimum baseline glow present everywhere.
  5. Card 5
    HintConsiders all light paths, including reflections.Memory TipThink of 'global' as accounting for all possible light interactions.
  6. Card 6
    HintMany factors influence a pixel's value.Memory TipLOSER: Light, Orientation, Surface, Environment, Receiver .
  7. Card 7
    HintHighlights and shadows define form.Memory TipIntensity is like the skin that shows the shape underneath.
  8. Card 8
    HintSeeing color as a consistent property.Memory TipYour brain corrects color.
  9. Card 9
    HintChanging color values.Memory TipMultiply RGB to fix color.
  10. Card 10
    HintBrightest pixel is reference.Memory TipThe highest value represents white.
  11. Card 11
    HintAverage color is neutral gray.Memory TipAverage turns to gray.
  12. Card 12
    HintChoosing white as the reference.Memory TipAdjusting colors so 'white' looks right.

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