Interactive Computer Graphics

Interactive Computer Graphics - JMU Bachelor Informatik

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Kartei Details

Karten	272
Sprache	English
Kategorie	Informatik
Stufe	Universität
Erstellt / Aktualisiert	27.07.2022 / 31.07.2022
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How do you calculate the magnitude of refraction?

r = 2(n * l)l - n

|t| = (1 - F)|i|

|r| = F|i|

|t| = |i| - |i|F

What unit is used for radian flux?

J/s

m/s

How many photons per joule are there for γ = 625?

3.27 * 10^18

2.87 * 10^18

3.15 * 10^18

2.77 * 10^18

Which symbol has the radiant energy?

Which symbol has the radiant flux?

Which symbol has the irradiance?

Which symbol has the exitance?

Which symbol has the radiant intensity?

Which symbol has the radiance?

What is a steradiant?

An intersection arc on a unit circle.

An intersection rectangle on a unit cube.

An intersection patch on a unit sphere.

When is the point light approximation reasonable?

If the distance to the light is half or less of the light’s width.

If the distance to the light is at least twice the light’s width.

If the distance to the light is at less than the light’s width.

If the distance to the light is at least five times the light’s width.

What is a BRDF?

A 4 DoF gantry to measure radiance

A function defining how light is reflected at opaque surfaces.

A distribution.

A geometry for isotropic emission.

What are examples for BRDFs?

Phong reflection Model

He-Torrance Comprehensive Analytic Model

Oren-Nayar Diffuse Microfacet BRDF

Cook-Torrance Specular Microfacet BRDF

Fu-Corrant Ambience Model

Ray Tracing Steps

Generate ray through pixel
Find closest intersect with scene
Calculate light intensity
Set pixel color

Surface Irradiance is ...

proportional to density of rays.

inversely proportional to incoming light density.

proportional to the cosine of the incoming light.

A vector ...

... can define a point if the vector is bound.

... can be bound or unbound.

... can be open or closed.

... is an element operator for scalars.

... can describe a direction.

A point ...

... is an element operator for scalars.

... is the intersection of two lines.

... can be open or closed.

... is an object without a higher dimensional measure of value described by the intersection of two lines.

... can be bound or unbound.

The difference between two points is ...

... a point.

... a vector.

The sum of two vectors is ...

... a vector.

... a point.

The sum of a vector and a point is ...

... a point.

... a vector.

Which of the following elements describe a vector in homogenous representation?

(0, 1, 0)

[3, 1, 2, 0]

(1, 0, 0, 1)

(0, 1, 1)

[0, 1, 1]

Which of the following elements describe a point in homogenous representation?

(0, 1, 0)

[0, 1, 0, 0]

(0, 1, 0, 1)

[3, 7, 1]

(1, 1, 1)

Why do we use homogeneous coordinates?

to avoid memory padding

to reduce notation ambiguity

to uniformly represent vectors and points

to increase information density

Which of the following statements are true?

Homogeneous coordinates normally have a 0 or 1 value in the fourth component

A frame of reference always requires orthonormal base vectors.

Homogeneous coordinate systems are bases.

Homogeneous coordinate systems are frames of references.

What is a matrix?

An always quadratic array of elements arranged in rows and columns.

A rectangular array of elements arranged in rows and columns.

A periodic cluster of elements arranged in rows and columns.

A square collection of elements arranged in rows and columns.

Which of the following equations involving a multiplicative identity element I are true?

IA = A

IAI = I

A + I = A

AI = A^(-1)

Which of the following equations involving a multiplicative identity element I are true for all matrices A and B?

BAA^(-1)B^(-1) = I

(AA)^T = A^(-1)

A^(-1) = (IA)^T

B^(-1)A^(-1) = AB^(-1)

Given three square matrices A, B, C, which of the following statements are true?

A(BC) = (CB)A

A(BC) = A(CB)

A(BC) = (AB)C

A(BC) = (AB)(AC)

What operation does the following matrix represent?

1 0 0 -1

0 1 0 -1

0 0 1 -1

0 0 0 1

Rotating around the line of origin with the direction (-1, -1, -1).

Translation into the direction (-1, -1, -1).

Reflecting on all three planes described by the base vectors.

Why do we want different classes for vectors and points?

To exploit type checking and avoid illegal operations.

To store both types together in data structures and collections like arrays.

To manually select correct methods by checking an object’s type during runtime.

Padding is …

... used to fill-up data elements to avoid memory holes during garbage collection.

... the definition of data element sizes to match the memory access architecture of the computer.

... the correspondence of cache and main memory in terms of the data bus.

... used to fill up data elements to achieve proper memory alignment.

... used to match two data elements which carry different payloads.

Memory alignment is ...

... used to fill-up data elements to avoid memory holes during garbage collection.

... the defintion of data element sizes to match the memory access architecture of the computer.

... the correspondence of cache and main memory in terms of the data bus.

... the definition of the memory access architecture to match powers of 2.

... used to match two data elements which carry different payloads.

What is to consider during the design of base classes?

Are there any common methods or properties for derived classes?

They are perfect to minimize coupling and to maximize coherence.

They should always be preferred in contrast to composition patterns.

To store and access diverse derived classes in common data structures and collections.

You know that, in general, the order of transformation matters. Under which cases is the transformation for a single object invariant to the order?

The complete transformations ...

only contains rotation and translation

only contain similar operations. I.e. only rotations or only translations

remain the same when two consecutive transformations are swapped, e.g. T*S*R = T*R*S

Which coordinate system is a ray transformed to after creation?

World coordinate system

Camera coordinate system

Object coordinate system

In a scene graph attributed geometry and animations are represented by ... .

leaf nodes

outer nodes

inner nodes

upper nodes

In a scene part-of relations and affine transformations are specified by ... .

leaf nodes

outer nodes

inner nodes

edges

In a scene graph vertical connections specifying parent-child relation are represented by ... .

leaf nodes

edges

inner nodes

upper nodes

Scene Graph:

One of the roots of the DAG (directed acyclic graph) represents the ... .

camera coordinate system

world coordinate system

perspective coordinate system

object coordinate system

Which of the following statements are true?

Nodes with a common ancestor always share all properties.

A node with a transformation property applies this transformation to all children of this node which then is transitively applied to all child nodes.

The camera object is always outside of the graph since it specifies no geometry.

After a scene graph is traversed during a general transformation traversal, all objects are represented in a common coordinate system.

Usually all cameras are treated like any other object node in the scene graph.

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