Computer Graphics Prefinal

scene graph

At the heart of a 3D graphics framework is a _____: a data structure that organizes the contents of a 3D scene using a hierarchical or tree-like structure.

Tree, Nodes

A_____ represents a hierarchical nature of structure in a graphical form. It consists of elements called _____,

child nodes

with each node links to its successors. The successors of a node are its _____

parent

while the predecessor of a node is called its _____.

root node

special node called the _____. This node is the tree's topmost node.

model matrix

The accumulated transformations applied to an object are stored as the product of the corresponding matrices, which is a single matrix called the _____ of the object.

current location, orientation, scale

The model matrix effectively stores the _____, _____, and _____ of an object.

transform

The model matrix effectively stores the current location, orientation, and scale of an object. These three (3) are collectively referred to as the _____ of the object

world transformation

The transform of an object relative to the root of the scene graph, often called a _____, can be calculated from the product of the model matrix of the object and those of each of its ancestors

compound object

A scene graph structure also allows simple geometric shapes to be grouped together into a _____ that can be easily transformed into a single unit

graph-based framework

A scene _____ allows you to create interactive scenes containing complex objects,

• A matrix to store its transform data

• A list of references to child objects

• A reference to a parent object

The corresponding class (ex. Object3D class) shall contain three (3) items:

(Scene)

Root node

(Group)

Interior nodes used for grouping purposes

(Mesh)

Nodes corresponding to objects that can be rendered

(Camera)

Virtual camera for rendering the point of view

(Light)

Virtual light source that affects the shading and shadows

(Geometry)

The general shape and other vertex-related properties of each mesh

(Material)

The general appearance of an object

(Renderer)

The general initialization tasks and image rendering

vertex buffers

(whose references shall be stored by attribute objects stored in the geometry)

attribute variables

(specified by shaders stored in the material).

vertex array object (VAO).

associates vertex buffers to attribute variables. This will allow geometric objects to be reused and rendered with different materials in different meshes.

Attribute objects

that describe vertex properties, such as position and color.

Geometric objects

shall also store texture coordinates, for applying images to shapes, and normal vectors, for use in lighting calculations.

render settings

The _____ are the properties which are set by calling functions, such as the type of geometric primitive s (points, lines, or triangles), point size, line width, and so forth

scene object, camera object

The rendering function in the Renderer class shall require two ( 2 ) parameters: a _____ and a camera object.

transformation of a mesh, transformation of the virtual camera, perspective transformation

There are three ( 3 ) required uniform variables by most shaders whose values are stored outside the material. These are the_____, the _____ used for viewing the scene, and the _____ applied to all objects in the scene.