Function Particles_CustomEffect

src/Particle.c:507–555

}

void Particles_CustomEffect(int effectID, float x, float y, float z, float originX, float originY, float originZ) {
	struct CustomParticle* p;
	struct CustomParticleEffect* e = &Particles_CustomEffects[effectID];
	int i, count = e->particleCount;
	Vec3 offset, delta, origin;
	float d;

	origin.x = originX; origin.y = originY; origin.z = originZ;

	for (i = 0; i < count; i++) 
	{
		if (custom_count == PARTICLES_MAX) Custom_RemoveAt(0);
		p = &custom_particles[custom_count++];
		p->effectId = effectID;

		offset.x = Random_Float(&rnd) - 0.5f;
		offset.y = Random_Float(&rnd) - 0.5f;
		offset.z = Random_Float(&rnd) - 0.5f;
		Vec3_Normalise(&offset);

		/* See https://karthikkaranth.me/blog/generating-random-points-in-a-sphere/ */
		/* 'Using normally distributed random numbers' */
		d  = Random_Float(&rnd);
		d  = Math_Exp2(Math_Log2(d) / 3.0); /* d^1/3 for better distribution */
		d *= e->spread;

		p->base.lastPos.x = x + offset.x * d;
		p->base.lastPos.y = y + offset.y * d;
		p->base.lastPos.z = z + offset.z * d;
		
		Vec3_Sub(&delta, &p->base.lastPos, &origin);
		Vec3_Normalise(&delta);

		p->base.velocity.x = delta.x * e->speed;
		p->base.velocity.y = delta.y * e->speed;
		p->base.velocity.z = delta.z * e->speed;

		p->base.nextPos  = p->base.lastPos;
		p->base.lifetime = e->baseLifetime + (e->baseLifetime * e->lifetimeVariation) * ((Random_Float(&rnd) - 0.5f) * 2);
		p->totalLifespan = p->base.lifetime;

		p->base.size = e->size + (e->size * e->sizeVariation) * ((Random_Float(&rnd) - 0.5f) * 2);

		/* Don't spawn custom particle inside a block (otherwise it appears */
		/*   for a few frames, then disappears in first PhysicsTick call)*/
		collideFlags = e->collideFlags;
		if (IntersectsBlock(&p->base, CustomParticle_CanPass)) custom_count--;
	}
}
#else
static int custom_count;