Object will not move when applied force to?

**Emmanuel U** · 10-22-2012,09:54 PM

So I was messing around with Jumper/JDM's rocket gun the other day and decided to make a dildo gun. I got the dildo to spawn but for some reason it just sits in front of me instead of shooting forward like how it should. Here's the source and any help is appreciated.

Code:

void rocket_aim(void){
		GET_CURRENT_CHAR_WEAPON(GetPlayerPed(), &wWeapon);
		if((wWeapon == WEAPON_PISTOL) && (IS_BUTTON_PRESSED(0,BUTTON_L))){
		
			GET_GAME_CAM(&game_cam);
			if (IS_CAM_ACTIVE(game_cam)){
				GET_CAM_ROT(game_cam, &gcrotX, &gcrotY, &gcrotZ);// used for setting the object rotation and for some weird trig stuff below
				GET_CAM_POS(game_cam, &gcX, &gcY, &gcZ);// used for the spawn point of the object, because the player is offset while aiming
				if (gcrotX < 0.0)// the range for cam rot is -180 to 180, to set object rot we need 0 to 360
				{
					objrotX = gcrotX + 360.0;
				}
				else
				{
					objrotX = gcrotX;
				}
				if (gcrotZ < 0.0)
				{
					objrotZ = gcrotZ + 360.0;
				}
				else
				{
					objrotZ = gcrotZ;
				}
				/*  the trig stuff below could possibly be replaced with vectors, I have no idea how to do that though.  *
				*   I apologize if this is confusing, but if you want to change the distance from the game_cam that the  *
				*   object is spawned, adjust "3.0" to your preference on the first and fourth lines.  Also prjT is the  *
				*   adjacent side from the pitch calculation, its purpose is to be the tangent in the following 2 lines */
				prjT = (3.0 * COS(gcrotX));       // adj side calculation to be used as a tangent below
				prjX = gcX - (prjT * SIN(gcrotZ));// calculates how far to spawn the object from the game_cam on the X plane
				prjY = gcY + (prjT * COS(gcrotZ));// calculates how far to spawn the object from the game_cam on the Y plane
				prjZ = gcZ + (3.0 * SIN(gcrotX)); // calculates how far to spawn the object from the game_cam on the Z plane
			}
		}
}

void rocket_shoot(void){
	GET_CURRENT_CHAR_WEAPON(GetPlayerPed(), &wWeapon);
	if((wWeapon == WEAPON_PISTOL) && (IS_CHAR_SHOOTING(pPlayer))){
		
		REQUEST_MODEL(MODEL_dildo);
		while(!HAS_MODEL_LOADED(MODEL_dildo)){
			WAIT(0);
		}
		
		CREATE_OBJECT(MODEL_dildo, prjX, prjY, prjZ, &ObjectProjectile, 1);
		MARK_MODEL_AS_NO_LONGER_NEEDED(MODEL_dildo);
		if(DOES_OBJECT_EXIST(ObjectProjectile)){
			//SET_OBJECT_VISIBLE(ObjectProjectile, 0);
			SET_OBJECT_AS_STEALABLE(ObjectProjectile, 1);
			SET_OBJECT_ROTATION(ObjectProjectile, objrotX, 0.0, objrotZ);
			SET_OBJECT_RECORDS_COLLISIONS(ObjectProjectile, true);
			//SET_OBJECT_DYNAMIC(ObjectProjectile, 1);
			APPLY_FORCE_TO_OBJECT(ObjectProjectile, 1, 0.0, 90.0, 0.0, 0.0, 0.0, 0.0, 1, 1, 1, 1);
			WAIT(100);
		}
		if (HAS_OBJECT_COLLIDED_WITH_ANYTHING(ObjectProjectile)){
			GET_OBJECT_COORDINATES(ObjectProjectile, &x,&y,&z);
			ADD_EXPLOSION(x,y,z,EXPLOSION_CAR,10.0f,true,false,0.7f);
			DELETE_OBJECT(&ObjectProjectile);
		}
	}
}

void dildo_aim(void){
		GET_CURRENT_CHAR_WEAPON(GetPlayerPed(), &wWeapon);
		if((wWeapon == WEAPON_DEAGLE) && (IS_BUTTON_PRESSED(0,BUTTON_L))){
		
			GET_GAME_CAM(&game_cam);
			if (IS_CAM_ACTIVE(game_cam)){
				GET_CAM_ROT(game_cam, &gcrotX, &gcrotY, &gcrotZ);// used for setting the object rotation and for some weird trig stuff below
				GET_CAM_POS(game_cam, &gcX, &gcY, &gcZ);// used for the spawn point of the object, because the player is offset while aiming
				if (gcrotX < 0.0)// the range for cam rot is -180 to 180, to set object rot we need 0 to 360
				{
					objrotX = gcrotX + 360.0;
				}
				else
				{
					objrotX = gcrotX;
				}
				if (gcrotZ < 0.0)
				{
					objrotZ = gcrotZ + 360.0;
				}
				else
				{
					objrotZ = gcrotZ;
				}
				/*  the trig stuff below could possibly be replaced with vectors, I have no idea how to do that though.  *
				*   I apologize if this is confusing, but if you want to change the distance from the game_cam that the  *
				*   object is spawned, adjust "3.0" to your preference on the first and fourth lines.  Also prjT is the  *
				*   adjacent side from the pitch calculation, its purpose is to be the tangent in the following 2 lines */
				prjT = (3.0 * COS(gcrotX));       // adj side calculation to be used as a tangent below
				prjX = gcX - (prjT * SIN(gcrotZ));// calculates how far to spawn the object from the game_cam on the X plane
				prjY = gcY + (prjT * COS(gcrotZ));// calculates how far to spawn the object from the game_cam on the Y plane
				prjZ = gcZ + (3.0 * SIN(gcrotX)); // calculates how far to spawn the object from the game_cam on the Z plane
			}
		}
}

void dildo_shoot(void){
	GET_CURRENT_CHAR_WEAPON(GetPlayerPed(), &wWeapon);
	if((wWeapon == WEAPON_DEAGLE) && (IS_CHAR_SHOOTING(pPlayer))){
		
		REQUEST_MODEL(MODEL_dildo);
		while(!HAS_MODEL_LOADED(MODEL_dildo)){
			WAIT(0);
		}
		
		CREATE_OBJECT(MODEL_dildo, prjX, prjY, prjZ, &ObjectProjectile, 1);
		MARK_MODEL_AS_NO_LONGER_NEEDED(MODEL_dildo);
		if(DOES_OBJECT_EXIST(ObjectProjectile)){
			SET_OBJECT_AS_STEALABLE(ObjectProjectile, 1);
			SET_OBJECT_ROTATION(ObjectProjectile, objrotX, 0.0, objrotZ);
			SET_OBJECT_RECORDS_COLLISIONS(ObjectProjectile, true);
			SET_OBJECT_DYNAMIC(ObjectProjectile, 1);
			APPLY_FORCE_TO_OBJECT(ObjectProjectile, 1, 0.0, 90.0, 0.0, 0.0, 0.0, 0.0, 1, 1, 1, 1);
			WAIT(100);
		}
		if (HAS_OBJECT_COLLIDED_WITH_ANYTHING(ObjectProjectile)){
			//GET_OBJECT_COORDINATES(ObjectProjectile, &expx,&expy,&expz);
			WAIT(500);
			if(DOES_OBJECT_EXIST(ObjectProjectile)){
				DELETE_OBJECT(&ObjectProjectile);
			}
		}
	}
}

Mainly the part I'm concerned about is the rocket_shoot void.

**jumper** · 10-22-2012,10:28 PM

You probably want to uncomment SET_OBJECT_DYNAMIC, most of the problems I had were related to that and how I used it.

**Emmanuel U** · 10-22-2012,10:49 PM

alright I tried, same problem.....was there any other things you had to add or take out? Also I was told SET_OBJECT_INITIAL_VELOCITY was better then applying force

**jumper** · 10-22-2012,11:01 PM

Hard to say, it was a real pain to get it working with different models. Something as simple as a wait before applying force might work, but what works for that model, might not work right with others. I also never tried the record collisions thing, so I don't know how that affects launching it. This is how I did it in the first script:

Code:

{
		ShootObject = 0;
		while(!HAS_MODEL_LOADED(ProjectileModel[SelectedProjectile]))
		{
			WAIT(0);
		}
		CREATE_OBJECT(ProjectileModel[SelectedProjectile], prjX, prjY, prjZ, &ObjectProjectile, 1);
		SET_OBJECT_VISIBLE(ObjectProjectile, 0);
		MARK_MODEL_AS_NO_LONGER_NEEDED(ProjectileModel[SelectedProjectile]);
		if(DOES_OBJECT_EXIST(ObjectProjectile))
		{
			WAIT(100);
			SET_OBJECT_AS_STEALABLE(ObjectProjectile, 1);
			SET_OBJECT_ROTATION(ObjectProjectile, objrotX, 0.0, objrotZ);
			SET_OBJECT_DYNAMIC(ObjectProjectile, 1);
			APPLY_FORCE_TO_OBJECT(ObjectProjectile, 1, 0.0, 90.0, 0.0, 0.0, 0.0, 0.0, 1, 1, 1, 1);
			SET_OBJECT_VISIBLE(ObjectProjectile, 1);
		}
	}

And this is from the latest version:

Code:

void ShootObject(void)
{
	GET_OBJECT_COORDINATES(objl_muz, &muzX, &muzY, &muzZ);
	REQUEST_MODEL(objl_model);
	while(!HAS_MODEL_LOADED(objl_model))	{	WAIT(0);	}
	CREATE_OBJECT(objl_model, muzX, muzY, muzZ, &objl_object, 1);
	while(!DOES_OBJECT_EXIST(objl_object))	{	WAIT(0);	}
	SET_OBJECT_ROTATION(objl_object, olP - 20.0f, 0.0f, olH);
	while(IS_OBJECT_STATIC(objl_object))
	{
		WAIT(0);
		SET_OBJECT_DYNAMIC(objl_object, 1);
		if(IS_BUTTON_PRESSED(0, BUTTON_O))
		{
			break;
		}
	}
	APPLY_FORCE_TO_OBJECT(objl_object, 1, 0.0f, TO_FLOAT(objl_force) * 10, 0.0f, 0.0f, 0.0f, 0.0f, 1, 1, 1, 1);
	MARK_OBJECT_AS_NO_LONGER_NEEDED(&objl_object);
}

**MaxSpeed** · 10-23-2012,08:31 AM

Use SET_OBJECT_INITIAL_VELOCITY. Look through my "weapon mods" source. It's a pretty ugly/confusing piece of coding, but that's how its done.

**Emmanuel U** · 10-23-2012,10:53 PM

Can I haz an example? I was looking in your source but I couldn't really understand all the equations you used to set the velocity lol.

**MaxSpeed** · 10-24-2012,09:24 AM

Well I'm going to have to go off the top of my head. Heres the basics:

Code:

Vector3 oVel;
Vector3 oStart; //Fill with coords of where your spawning the object from
Vector3 oTarget; //where you want the object to hit

float fDist = 0.0f; //Distance between start and target

And heres the basics of the get velocity:

Code:

#define SPEED 200

GET_DISTANCE_IN_3D_WORLD(oStart.x,oStart.y,oStart.z,oTarget.x,oTarget.y,oTarget.z,&fDist);
//Native is probably wrong but its something like this

//A thanks to zorg93 who taught me this algorithm :D
oVel.x = SPEED * (oStart.x - oTarget.x) / fDist;
oVel.y = SPEED * (oStart.y - oTarget.y) / fDist;
oVel.z = SPEED * (oStart.z - oTarget.z) / fDist;

//spawn object & set dynamic

SET_OBJECT_INITIAL_VELOCITY(oProjectile,oVel.x,oVel.y,oVel.z);

You'll then need to detect when it hits something so you can delete it. I also suggest you have an object array of at least 10 so you're always able to shoot.

**Emmanuel U** · 10-24-2012,05:16 PM

ok thanks, I noticed you are using SPEED defined to 200 but as in your weapon_mods.cpp on pastebin sets it to 500. Which one should I use?

**MaxSpeed** · 10-24-2012,05:35 PM

500. I couldn't remember what it was.

**Emmanuel U** · 10-27-2012,12:02 PM

ok it seemed to work, but is there any way to make it slow down when shooting it....it seems to shoot to fast that you can barely see it

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