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Code Issues 154 Wiki Activity

Let the templates of smoke sources set how fast their particles rise or fall

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Hirek
2026-10-20 17:12:23 +02:00
parent 867497b658
commit abbdca4773
7 changed files with 47 additions and 6 deletions
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16
shaders/particles_smoke_simulate.comp
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@@ -37,10 +37,18 @@ bool advance(inout smoke_particle_s particle, smoke_source_s source, float secon
if (particle.state.x <= 0.0)
return false;
particle.velocity.w = clamp(particle.velocity.w + source.sizechange.x * seconds, source.sizechange.y, source.sizechange.z);
// crude smoke dispersion
particle.velocity.y += source.motion.x * particle.velocity.y * seconds;
particle.velocity.y -= source.motion.y * particle.velocity.y * seconds;
particle.velocity.y = max(source.motion.z, particle.velocity.y);
if (source.settling.z > 0.5)
{
// the drag of the air takes the particle towards the velocity it settles at
particle.velocity.xyz += (vec3(0.0, source.settling.x, 0.0) - particle.velocity.xyz) * (1.0 - exp(-source.settling.y * seconds));
}
else
{
// crude smoke dispersion
particle.velocity.y += source.motion.x * particle.velocity.y * seconds;
particle.velocity.y -= source.motion.y * particle.velocity.y * seconds;
particle.velocity.y = max(source.motion.z, particle.velocity.y);
}
particle.position.xyz += particle.velocity.xyz * seconds;
particle.position.xyz += 0.1 * particle.state.y * wind.xyz * seconds;
particle.state.y += seconds;