Interactive Computer Graphics

Interactive Computer Graphics - JMU Bachelor Informatik

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Flashcards	272
Language	English
Category	Computer Science
Level	University
Created / Updated	27.07.2022 / 31.07.2022
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Why are we using matrices in a scene graph?

To define geometric objects.

To describe relative positions between objects.

To describe absolute positions of objects.

To describe movements.

How is a scene graph normally traversed?

breath first

shallow first

depth first

What data structure is used for iterative scene graph traversal?

a heap

a stack

a fifo

Which parts of the scene are part of the scene graph?

coordinate systems

cameras

light

object properties

animations

Why do we use a directed acyclic graph rather than a list as representation of the scene?

Searching objects takes less time because the scene graph is basically a tree.

Modifying a common ancestor of objects relative to a camera node affects the displayed behaviour all the descendants.

Because GIT uses DAGs for branches, thus we can store object relations as files in the version control system.

The intrinsic relationships between nodes use relative rather than absolute transformations.

Which tasks are done best in the world coordinate system?

Geometry definition

Lighting calculation

Intersection calculation

Creation of primary rays

Creation of secondary rays

Which tasks are done best in the object coordinate system?

Geometry definition

Lighting calculation

intersection calculation

creation of primary rays

creation of secondary rays

Which tasks are done best in the camera coordinate system?

Geometry definition

Lighting calculation

Intersection calculation

Creation of primary rays

Creation of secondary rays

How can one reduce the number of traversal steps required for the render visitor?

store transformation matrices on a stack

store combined transformations within the nodes

build up a heap structure

Which technology uses Forward Rendering?

Ray Tracing

Rasterization

Which technology uses Backward Rendering?

Ray Tracing

Rasterization

Which technology requires ray intersections?

Ray Tracing

Rasterization

In which technology is exploiting coherence difficult?

Ray Tracing

Rasterization

In which technology is exploiting coherence easy?

Ray Tracing

Rasterization

Which technology operates mainly in the object space?

Ray Tracing

Rasterization

Which technology operates in the object and screen space?

Ray Tracing

Rasterization

Which technology requires object projections?

Ray Tracing

Rasterization

Which technology follows rays from 2D to 3D?

Ray Tracing

Rasterization

Which technology projects objects from 3D to 2D?

Ray Tracing

Rasterization

Which are Graphics APIs?

DirectX

Vulkan

OpenGL

OpenSG

JS3D

Which are Graphics APIs?

WebGL

Java3D

Unity3D

Open5G

WebSG

What are the 9 stages of the rasterization pipeline?

Vertex Specification
Vertex Shader
Tessellation
Geometry Shader
Vertex Post-Processing
Primitive Assembly
Rasterization
Fragment Shader
Per-Sample Operations

What is tessellation?

The assembling of vertices to primitives.

The depth test to determine z buffer order.

The decomposition of geometry into simple structures.

The warping of fragments into the three dimensional realm.

Where is a frame buffer used in computer graphics?

To store pixel values

To store the screen resolution

The z-buffer is a frame buffer

To store hidden bits

Which stages of the rasterization pipeline remain almost the same when switching to a ray tracing pipeline?

Model-View Transformation

Projection

Primitive Assembly

Clipping

Interpolation

Which stages of the rasterization pipeline remain almost the same when switching to a ray tracing pipeline?

Shading

Visibility Resolution

Projection

Model-View Transformation

Clipping

Which type of transformations are performed for changes of coordinate systems?

combined transformations

clipped transformations

assembly transformations

affine transformations

Which coordinate system transition is done in the projection stage of the rasterization pipeline?

camera coordinate system to normalized device coordinate system

world coordinate system to camera coordinate system

normalized device coordinate system to object coordinate system

object coordinate system to world coordinate system

object coordinate system to camera coordinate system

Which input information does the primitive assembly stage need?

connectivity information and transformed vertices

segments of rasterized primitives and pixel area

z-buffer representation and depth values

How do fragments and pixels compare to each other?

Each fragment corresponds to one pixel’s area.

One fragment is created per primitive potentially covering multiple pixels.

Rasterization can produce multiple fragments per-pixel.

What is a Z-buffer?

A 3D map describing the depth values for each pixel from the current perspective.

A cache for the Z transformation of each object in the scene.

A 2D map describing the depth values for each pixel from the current perspective.

Which of the following are Shader Languages?

High Level Shading Language

Forward Shading Language

RenderMan Shading Language

Precision Shading Language

OpenGL Shading Language

Which shader stages are programmable in the OpenGL Polygon Rendering Pipeline?

Tesselation-Control-Shader

Geometry-Shader

Screen-Mapping-Shader

Frame-Buffer-Shader

Vertex-Shader

Which Shader Stages need to be implemented in a WebGL application?

Vertex-Shader

Tesselation-Control-Shader

Tesselation-Evaluation-Shader

Geometry-Shader

Fragment-Shader

Which shader defines the final normal to be used for lighting computation in Flat Shading?

Vertex Shader

Tessellation Shader

Fragment Shader

Which shader defines the final normal to be used for lighting computation in Gouraud Shading?

Vertex Shader

Tessellation Shader

Fragment Shader

Which shader defines the final normal to be used for lighting computation in Phong Shading?

Vertex Shader

Tessellation Shader

Fragment Shader

Which shader is the last one to have an influence on the color to be applied to the pixel later on in Flat Shading?

Vertex Shader

Tessellation Shader

Fragment Shader

Which shader is the last one to have an influence on the color to be applied to the pixel later on in Gouraud Shading?

Vertex Shader

Tessellation Shader

Fragment Shader

Which shader is the last one to have an influence on the color to be applied to the pixel later on in Phong Shading?

Vertex Shader

Tessellation Shader

Fragment Shader

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