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38 lines
1.5 KiB
Text
38 lines
1.5 KiB
Text
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/// @func BBMOD_MixSpeedModule([_from[, _to]])
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///
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/// @extends BBMOD_ParticleModule
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///
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/// @desc A particle module that randomly sets initial magnitude of particles'
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/// velocity vector.
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///
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/// @param {Real} [_from] The minimum velocity vector magnitude. Defaults to 1.0.
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/// @param {Real} [_to] The maximum velocity vector magnitude. Defaults to `_from`.
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///
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/// @see BBMOD_EParticle.VelocityX
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/// @see BBMOD_EParticle.VelocityY
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/// @see BBMOD_EParticle.VelocityZ
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function BBMOD_MixSpeedModule(_from=1.0, _to=_from)
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: BBMOD_ParticleModule() constructor
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{
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BBMOD_CLASS_GENERATED_BODY;
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/// @var {Real} The minimum velocity vector magnitude. Default value is 1.0.
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From = _from;
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/// @var {Real} The maximum velocity vector magnitude. Default value is the
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/// same as {@link BBMOD_MixSpeedModule.From}.
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To = _to;
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static on_particle_start = function (_emitter, _particleIndex) {
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var _particles = _emitter.Particles;
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var _velocityX = _particles[# BBMOD_EParticle.VelocityX, _particleIndex];
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var _velocityY = _particles[# BBMOD_EParticle.VelocityY, _particleIndex];
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var _velocityZ = _particles[# BBMOD_EParticle.VelocityZ, _particleIndex];
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var _norm = sqrt((_velocityX * _velocityX) + (_velocityY * _velocityY) + (_velocityZ * _velocityZ));
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var _factor = lerp(From, To, random(1.0)) / max(_norm, 0.001);
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_particles[# BBMOD_EParticle.VelocityX, _particleIndex] = _velocityX * _factor;
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_particles[# BBMOD_EParticle.VelocityY, _particleIndex] = _velocityY * _factor;
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_particles[# BBMOD_EParticle.VelocityZ, _particleIndex] = _velocityZ * _factor;
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};
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}
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