Homework1 Flashcards
(20 cards)
Which type of light has an additional parameter for range?
point
What are the three specific kinds of light sources?
point lights, spot lights, and parallel lights
True or False
Light that strikes a surface point head-on is more intense that light that just glances a surface point.
True
What type of lighting is used to model indirect lighting?
ambient
What type of lights approximate a light source that is very far away?
directional
What is the term given to a unit vector that determines the direction a point on a surface is facing?
surface normal
True or False
Specular light travels in a particular direction, and when it strikes a surface, it reflects equally in all directions.
False
True or False
Specular light travels in a particular direction, and when it strikes a surface, it reflects sharply in one general direction, thereby causing a bright shine that can only be seen at some angles.
True
A __________normal is a unit vector that describes the direction a polygon is facing
face
True or False
A good physical example of a parallel light is a flashlight.
false
The __________exponent controls the cone of reflectance and how shiny the surface of an object is.
specular exponent
Name the 3 different kinds of light emitted from a light source.
Ambient light
Diffuse light
Specular light
You would use ________ light to model the direct lighting of relatively smooth surfaces.
specular
True or False
The light vector is the vector from the surface to the light source and it is aimed in the same direction the light rays travel.
False
What type of lighting is used to model the direct lighting of relatively rough surfaces?
diffuse
A _________ light emits light in every direction.
point
True or False
Ambient light models indirect light that has scattered and bounced around the scene so many times that it strikes the object equally in every direction, thereby uniformly brightening it up.
True
__________can be thought of as the properties that determine how light interacts with a surface of an object.
Materials
A light bulb is a good example of a __________ light.
point
A good example of a _________ is a flashlight.
spotlight
