Yes, my original conversion is all "p."

Code:

---

function sparks(PARTICLE *p)
{
	VECTOR temp;
	temp.x = random(20) - 10;
	temp.y = random(20) - 10;
	temp.z = random(20) - 10;
	vec_add(p.vel_x, temp);
	p.alpha = 70 + random(30);
	p.red=255;
	p.blue=0;
	p.green=0;
	p.size = 2;
	p.flags |= (BRIGHT|MOVE);
	p.lifespan = 20;
	p.event = fade_sparks;
}

---

But still cause E1515.

You may download the code and try lite-c laser

If you remark the "effect(sparks,100,my_vertex,nullvector);", the laser fire nicely.

If remove "PARTICLE *p" in sparks, no E1515 crash, like this
Code:

---

function sparks()
{
/*
	VECTOR temp;
	temp.x = random(20) - 10;
	temp.y = random(20) - 10;
	temp.z = random(20) - 10;
	vec_add(p.vel_x, temp);
	p.alpha = 70 + random(30);
	p.red=255;
	p.blue=0;
	p.green=0;
	p.size = 2;
	p.flags |= (BRIGHT|MOVE);
	p.lifespan = 20;*/
	my.event = fade_sparks;
}

---

I know it does not make sense, but in case like this
Code:

---

function sparks(PARTICLE *p)
{
}

---

It still crash.