Reflection and Illumination Concepts

The video tutorial covers the concepts of ambient, diffuse, and specular reflection in the illumination model. Ambient light is described as light received from various reflected sources, with its intensity determined by the ambient reflection coefficient and the material of the object. Diffuse reflection is explained as light seen by the viewer, independent of the viewer's direction, with intensity calculated using the angle between the light source and the normal vector. Specular reflection is discussed in terms of its occurrence on shiny surfaces, with intensity determined by the angle between the reflection vector and the viewer's direction. The video concludes by combining these reflections to form a realistic illumination model.

What does the ambient reflection coefficient depend on?

• The angle of incidence

• The distance from the light source

• The material of the object

• The color of the light source

What is the primary characteristic of ambient light in the illumination model?

• It varies with the viewer's position

• It is uniform across all surfaces

• It is directional

• It is only present in the daytime

In diffuse reflection, what is the relationship between the light source and the normal vector?

• They are parallel

• They have no relationship

• They form an angle that affects intensity

• They are perpendicular

How does the angle between the light source and the normal vector affect diffuse reflection?

• It changes the color of the reflection

• It does not affect the reflection

• It increases the reflection intensity

• It decreases the reflection intensity

How is the intensity of light affected by distance in diffuse reflection?

• It increases with distance

• It remains constant

• It is unaffected by distance

• It decreases exponentially with distance

Which factor is used to calculate the attenuation of light intensity in diffuse reflection?

• Angle of incidence

• Ambient reflection coefficient

• Specular reflection coefficient

• Distance from the object

What type of surfaces does specular reflection occur on?

• Rough surfaces

• Dull surfaces

• Shiny surfaces

• Transparent surfaces

What is the role of the angle between the reflection vector and the viewer direction in specular reflection?

• It determines the color of the reflection

• It affects the intensity of the reflection

• It has no effect on the reflection

• It changes the direction of the reflection

In the illumination model, which reflections are combined to achieve realistic image intensity?

• Ambient, diffuse, and specular

• Specular only

• Diffuse and specular only

• Ambient and diffuse only

What is the result of combining ambient, diffuse, and specular reflections in the illumination model?

• A less realistic image

• An image with no shadows

• A monochrome image

• A more realistic image