LIGHTS!!!!

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.