テンプレート:Release Notes/2.48/WindCollisions

Wind & Deflector force update

In Blender 2.48 wind and deflectors were updated to contain some of the most user requested features:

Deflectors deflect effectors with a specific absorption value

Wind noise option

Noise option added to wind

The normal Blender wind force is uniform, which isn't very realistic. Now you can now specify a noise value to make the wind change force, so it will look more natural.

Deflector can now also deflect effectors

Until now, there was no way to cancel out an effector force. All you could do was specify a range for the radius in which it would work. Now you can create objects that will block the force by absorbing it. You control this property by adjusting the Absorbtion spinner on the Collision panel. Set Absorbtion to 100% to block the force completely. If you have 3 collision objects in series, with absorbtion values of 10%, 43% and 3%, the absorption after the last one ends up at around 46%.

Both this features also work in using realtime physics with enabled "continues physics" (See Timeline->Playback).

New Force Fields, "Charge" and "Lennard Jones"

Two new effector types: charge and a Lennard-Jones potential based force (inter-molecular forces for example).

• "Charge" is similar to spherical field except it changes behavior (attract/repulse) based on the affected particles charge field (negative/positive) like real particles with a charge.
• The "Lennard-Jones" field is a very short range force with a behavior determined by the sizes of the effector and affected particle. At a distance smaller than the combined sizes the field is very repulsive and after that distance it's attractive. It tries to keep the particles at an equilibrium distance from each other. Particles need to be close to each other to be affected by this field at all.

Particle systems can now have two effector fields (two slots in the fields panel). This allows to create particles which for example have both a charge and a Lennard-Jones potential.