[Bf-docboard] Error in documentation? Friction (softbodies)

[Kenneth Styrberg]

Hi, I've tried this out also when writing the doc and I did a quick test 
now. BUT I tested the Wind force field and its effect on a SoftBody and 
the effect is as I wrote in the doc. Your test shows a different 
behaviour when using gravity. This might be a bug in the code so we need 
the developers to check this.

//Styken

Olivier SARAJA (Linuxgraphic) wrote:

>Hi all,
>
>I disagree with the definition of the Friction number button in the softbody 
>interface (Objects (F7), Softbody tab) in the Chapter 23. Currently, the 
>documentation reads :
>
>"Friction - Sets the amount of friction the object has. A high value means 
>that forces, for example Gravity or Wind, have easier to grab hold of the 
>object and move it."
>
>According to my understantding, friction is to be compared to damping of the 
>global movement of the softbody, as if the air offered some resistance to its 
>movement. Consequently, a high value (air resistance active) means that an 
>object falls more slowly than with a low value (no air resistance, so fall is 
>quicker).
>
>I made some experiments (a jelly cube, Mass 1.00, Gravity 9.81, falling from a 
>distance of 20 blender units on a horizontal plane (the ground). With a 
>Friction of 1.00, the Cube reaches the floor within around 70 frames. With a 
>Friction of 0.00, it reaches the floor within 60 frames only.
>
>So I'd propose the following definition for this item:
>
>"Friction - Sets the amount of resistance to movement the objects faces. A 
>high value means that the object will respond more slowly to forces such as 
>Gravity, but also the various Fields: Wind, Force and Vortex."
>
>As usual, I don't have the knacks for CVS and DocBook, so I hope someone will 
>take in charge the modification (if you agree with my point of view, 
>obviously).
>
>Cheers,
>  
>