Real-Time Global Illumination with Voxel Cone Tracing
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Real-Time Global Illumination.pdf Flashcards
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Real-Time Global Illumination.pdf Flashcards
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What is the 24-bit True Color format?
The 24-bit True Color format provides eight bits of color depth for each component of an RGB triplet.
What additional component is often included in the 24-bit True Color format?
An additional alpha value component is included to represent the opacity of the pixel color.
What are the two main sciences related to geometrical optics in the context of computer graphics?
The two main sciences are radiometry and photometry.
What does radiometry concern itself with?
Radiometry concerns itself with the raw physical measurement of electromagnetic energy.
What does photometry focus on?
Photometry focuses more on the human-based perception of the visible spectrum.
Why is radiometry considered ideal for physically faithful rendering algorithms?
Differing wavelength sensitivities of human eye photoreceptors do not need to be individually accounted for in radiometry.
What is Radiant Flux or Radiant Power?
Radiant Flux or Radiant Power is the total amount of radiant energy emitted per unit time, quantified in units of Watts or Joules per second.
What is the formula for Radiant Flux (Q)?
Q = t W, where Q is the radiant energy emitted, transmitted, or reflected.
What is the definition of Irradiance (E)?
Irradiance is the total flux incident on a surface per unit surface area.
What is the photometric quantity corresponding to Irradiance?
The photometric quantity corresponding to irradiance is called illuminance (E_d_i).
What is the formula for illuminance (E_d_i)?
E_d_i = dΦ/dA, where Φ is the total flux incident on a surface and A is the surface area.
What is Radiosity or Radiant Exitance (B)?
Radiosity or Radiant Exitance (B) is the total flux per unit surface area leaving or being emanated from a surface.
What is the formula for Radiosity (B)?
B = dΦ/dA, where Φ is the total flux leaving a surface and A is the surface area.
What is a solid angle?
A solid angle is a measurement for the amount of field of view from a particular point in a given direction.
How is a solid angle measured?
A solid angle is measured in steradians and is equal to a corresponding surface area intersected on a unit sphere centered around the point of origin.
What is the relationship between a solid angle and a unit sphere?
A solid angle value can quantify how large or bright an object looks to a given observer as it corresponds to the surface area of a unit sphere.
How can a location on a unit sphere be represented?
A location on a unit sphere can be represented by a pair of angles corresponding to the angle between a vector and the coordinate system's upward axis and the vector's angle of rotation around the upward axis.
What is the formula for calculating the differential surface element (dA) on a sphere?
dA = r^2 sin(θ) dθ dφ, where θ and φ are the differential latitudinal and longitudinal angles, respectively.
What is the surface area of a sphere?
The surface area of a sphere is 4πr^2.
What is the total solid angle of a sphere?
The total solid angle of a sphere is 4 steradians.
What does projecting a surface onto a plane that is perpendicular to a vector result in?
It results in a total projected surface area equal to cos(θ)dA.
What does the distance factor in projecting a surface onto a unit sphere correspond to?
The distance factor scales by an exponent of 2 due to the inverse-square law.
What is the formula for calculating the solid angle that encompasses an arbitrarily rotated surface?
The formula is cos(θ)dA/(x-x_0)^2.
What is Radiance?
Radiance describes the volumetric radiant energy and is a fundamental quantity to describe light flow in an environment.
What is the formula for Radiance (L)?
L(x) = p(x)hc, where p is the volume density of photons, h is Planck's constant, and c is the speed of light.
How is Radiance expressed in terms of radiant power?
Radiance can also be expressed as the radiant power entering or exiting a surface per unit solid angle per unit projected area.
What is the importance of Radiance in computer graphics?
Radiance indicates how much of the radiant power a surface emits is received by a camera pointing towards it, and by extension, how bright the surface appears.