20 THINGS I
KNOW ABOUT AFTER EFFECTS LIGHTS …
1-Which type of light would be
best to replicate a bare light bulb?
A Point
Light
2- How do lights affect 2D and 3D
objects differently?
2D layers
are not effected by lights.
3- What is Ambient Light?
An ambient
light evenly illuminates in all directions.
4- How is an Ambient Light
different from a Source Light?
An ambient
light evenly illuminates in all directions, while the source has a definite
cone.
5- What is a Parallel Light, and
why would one use it?
A point
light lets you aim the light rays and is very helpful in getting even
illumination while still having an effect based on the angle of the light and
layer.
6- Describes what happens to the
illumination of an object as it moves away from a light.
The light looses
intensity.
7- What happens to a layer as it
rotates away from the light source?
8- Describe a light's Cone Angle.
The angle at
which light moves from it’s source.
9- How do I move the light
without moving the POI?
Hold down Command
10- How do I move BOTH the light
AND POI at the same time?
11- Which type of light is the
ultimate 'FILL' light?
Ambient
Light.
12- What does the term 'Diffuse'
mean?
The spread
of light receiving layer
13- What does the term 'Specular'
mean?
Reflective
properties
14- Can a precomp layer cast
shadows?
15- What are the 5 requirements
that must be met for shadows to work?
1) A
nonambient light must be aimed at two layers.
2) The light
must have it’s “Cast Shadows” on
3) The layer
casting the shadow must have it’s “Cast Shadows” on
4) The
receiving layer must have it’s “accept shadows” on
5) Space
between the layer casting the shadow and the layer receiving the shadow.
16- As objects get closer to the
layer receiving it's shadow, does the shadow get sharper or more diffused?
Sharper
17- If a layer's 'Light
Transmission' is set for 100%, how does that affect the layer?
18- A 'GOBO' is like a stencil
placed in front of a light. Does the layer have to have an alpha, or can
the luminosity of the image work?
The layer
does have to have an alpha channel
19- Adding lights really slows
down the render of a scene, what are 3 things that you can do to speed up
visual feedback?
Pre-Comp,
Resolution, or size of the comp.
20- Can I adjust the brightness
intensity of a light below the value of 0?
What happens if I do?
Yes, It takes light out, even from other sources.
