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36 lines
1.2 KiB
Text
36 lines
1.2 KiB
Text
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/// @func BBMOD_DragModule()
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///
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/// @extends BBMOD_ParticleModule
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///
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/// @desc A particle module that applies drag force to particles.
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///
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/// @see BBMOD_EParticle.Drag
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function BBMOD_DragModule()
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: BBMOD_ParticleModule() constructor
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{
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BBMOD_CLASS_GENERATED_BODY;
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static on_update = function (_emitter, _deltaTime) {
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var _particles = _emitter.Particles;
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var _particleIndex = 0;
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repeat (_emitter.ParticlesAlive)
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{
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var _mass = _particles[# BBMOD_EParticle.Mass, _particleIndex];
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if (_mass != 0.0)
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{
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var _dragHalf = _particles[# BBMOD_EParticle.Drag, _particleIndex] * 0.5;
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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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_particles[# BBMOD_EParticle.AccelerationX, _particleIndex] -=
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(_dragHalf * _velocityX * abs(_velocityX)) / _mass;
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_particles[# BBMOD_EParticle.AccelerationY, _particleIndex] -=
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(_dragHalf * _velocityY * abs(_velocityY)) / _mass;
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_particles[# BBMOD_EParticle.AccelerationZ, _particleIndex] -=
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(_dragHalf * _velocityZ * abs(_velocityZ)) / _mass;
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}
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++_particleIndex;
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}
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};
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}
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