How can I code something to react with any particle it touches?

In the regular code, if I want element X to react with element Y to create element Z, I would code

int update_X(UPDATE_FUNC_ARGS) {

...

if (((r&0xFF)==PT_Y))

{

create_part(i,x,y,PT_Z);

}

But what would I code if I wanted it to react with all particles?

please fill in the blank

int update_X(UPDATE_FUNC_ARGS) {

...

if (((r&0xFF)==PT_____))

{

create_part(i,x,y,PT_Z);

}

thanks, firefreak11

@tommig (View Post)

 thanks i will give it a try

@jacob1 (View Post)

@boxmein (View Post)

 thanks