# Need help

1. Feb 1, 2010

### cppgraphics

Dear folks,

I'm a 3D computer graphics student, working on particles and fields area. As I'm a newer I have lots of doubts to clear on Physics topics. Please explain me what is
Magnitude & Attenuation in Fields subject? I can see these two are common for most of the fields like air, drag, gravity, newton and so on.

2. Feb 2, 2010

### cragar

magnitude would be the strength of the field or the length of the vector if thats what your asking

3. Feb 3, 2010

### cppgraphics

I have attached a reference image please check it.

http://img188.imageshack.us/img188/5841/gravityfield.jpg [Broken]

I would like to know about the attributes I marked.

In this file I added particles in my scene and a Gravity field. The Gravity field is over the particles and the magnitude value of the field is 2, so its pulling particles down. If I give 0 magnitude the gravity field won't affect particles.

Please explain me technically or in physics terms what are magnitude, attenuation?

Where it comes in physics subject?

Hope to hear from you soon.

Last edited by a moderator: May 4, 2017
4. Feb 3, 2010

### DavidSnider

Magnitude is the strength of the field.
Attenuation is rate at which the force weakens with respect to distance.

In your example the field pushes the same at all distances because attenuation is 0.
If you increased attenuation the field would push less as the particle traveled further from it.

5. Feb 3, 2010

### cppgraphics

As I have Magnitude, if I want to reduce the force I can reduce the Magnitude will be ok. Then whats the need for separate force (Attenuation)???

6. Feb 3, 2010

### DavidSnider

It's kind of like sitting next to a fire. The heat source has a magnitude and is hottest at its center, but the amount you feel it reduces as you get further away from it.

7. Feb 3, 2010

### cppgraphics

Awesome David.:surprised

Thank you so much. Now I can understand what is magnitude and attenuation.

In Physics, which area these particles and fields will come?

What do you call it?