Game Development Reference
In-Depth Information
4
.
An orthographic projection doesn't have depth perception, which means
objects further away from the camera are not smaller than objects closer
to the camera. On the other hand, a perspective projection does have true
3D depth perception.
5
.
Ambient and directional lights both globally affect the scene. However,
ambient light is uniformly applied to the entire scene. On the other hand,
directional lights come from one specific direction, and because of this
they will not illuminate objects on all sides.
6
.
The three components of the Phong reflection model are ambient, diffuse,
and specular. The ambient component uniformly applies to the entire ob-
ject. The diffuse component depends on the position of lights in relation to
the surface, and is the primary reflection of light. The specular compon-
ents are the shiny highlights on the surface, and depend on both the light
position and the position of the camera. Phong reflection is considered a
local lighting model because each object is lit as if it were the only object
in the scene.
