AsBirthRule

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Revision as of 19:54, 6 August 2006 by Fre-Ber (talk | contribs) (Initial description)

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The asBirthRule files define a particle effect. A particle effect is an effect where many, small objects are spewed out from a point at certain occasions. For weather effects, the particles can be rain drops, for colliding with a parking meter, the particles may be coins.

The format is ASCII-based and consist of a block enclosed by { and }.

The files start with a definition of the type of banger data given. None of the MM2 files use anything but type a, like this:

type: a

Next comes the main asBirthRule block:

asBirthRule {
...
}

This block can contain several tag-value parameters:

Tags of the asBirthRule block
tag format Description
Position float float float Position where particles originate PositionVar float float float Variance in position, the origin is randomly modified within this range Velocity float float float Velocity and direction of the particles when created VelocityVar float float float Variance in velocity, the velocity is randomly modified within this range Life float Life-time of the particles LifeVar float Variance in life-time Mass float Mass of a particle MassVar float Variance in particle mass Radius float Size of a particle RadiusVar float Variance in particle size Drag float Unknown DragVar float Variance in drag Damp float Unknown DampVar float Variance in damp DRadius float Unknown DRadiusVar float Variance in dradius DAlpha float Unknown DAlphaVar float Variance in dalpha DRotation float Unknown DRotationVar float Variance in drotation InitialBlast int Unkown, maybe number of particles created immediately on activation SpewRate float rate of new particles per second? SpewTimeLimit float Maximum time, in seconds, for particle creation Gravity float Gravitational factor for particles, for Earth conditions enter -9.8 or thereabaouts TexFrameStart int Index of the first frame of particle animation in the image TexFrameEnd int Index of the last frame of particle animation in the image BirthFlags int Unknown Height float Unknown Intensity float Unknown Color int Unknown

The global particle effects use the texture image named "TODO: I could have sworn that I saw an image where the indices matched all of the default vehicular particle effect, now I can't find it", but object collision particle effects may use other images, see dgBangerData.