Hi!
Ich habe mal wieder ein Problem
Ich möchte wissen, ob ich vor oder hinter einer entity bin, nachdem ich diese brührt habe... Hatte mal nen Ansatzt mit winkelfunktionen, doch der erwies sich leider als falsch!
Vielleicht habt ihr ja eine idee wie man soetwas brechnen könnte?
Danke für eure hilfe!

Mfg Dark_samurai

hello

var varargwhy;
var varwhy;


while(my != null && you != null)
{
varargwhy = my.pan;
varwhy = you.pan;
varargwhy += 90; //change 90
if(varargwhy >= varwhy)
{
my.pan +=180;
}
varargwhy -= 90; //change 90
if(varargwhy <= varwhy)
{
my.pan +=180;
}
wait(1);
}
}

Hi!
@filts: Thanks for your quick answer!

Quote:

---

my.pan = varargwhy;
you.pan = varwhy;

---

This must be wrong?
did you meant: varargwhy = my.pan;...?

I'm soory for my realy bad explaination so I explain it again (this time in english):
I want a Code, which shows me if my Player stands behind or in front of the Object he touched. But it should do it like that:
every thing behind the green line should be calculated as behind and everything in front of the line in front! So the pan of the Objekt should also be used!
I hope everybody understood my explaination and sorry for my bad english!

Dark_samurai

yah srry

i am trying out somthing but maby u can do somthing white this

vec_to_angle (ANGLE* ang, VECTOR* dir);
Computes the pan and tilt angles of a direction vector, and places them into the pan and tilt parameters of an Euler angle. Very useful for trading an angle for a direction, thus computing the angles to a target.
Parameters:
ang Euler angle to be calculated.
dir direction vector.

Modifies:
ang

Speed:
Fast
Example:
function turn_towards_target()
{
// get the direction from the entity MY to the entity YOU
vec_set(temp,your.x);
vec_sub(temp,my.x);
vec_to_angle(my.pan,temp); // now MY looks at YOU
}
See also:

retry

var varargwhy;
var varwhy;
string* string_argwhy = " ";

while(my != null && you != null)
{
varargwhy = my.pan;
vec_set(temp,your.x);
vec_sub(temp,my.x);
vec_to_angle(argwhy,temp);
varargwhy += 90; //change 90
if(varargwhy >= varwhy)
{
str_cpy(string_argwhy,"i am behind");
}
varargwhy -= 90; //change 90
if(varargwhy <= varwhy)
{
str_cpy(string_argwhy,"i am behind)";
}
wait(1);
}
}

@filts: Sorry but your Code doesn't work...

After a few hours I got my old idea run without any mistakes. If there is anybody interested into the code than please send me a PM!

Dark_samurai

With the dot product this is really simple...

The dot product of two vectors is positive, if they "point in the same direction" (i.e. the angle between them is less than 90 degrees), it is zero if they are perpendicular to each other and negative if the angle between them is greater than 90 degrees.

So, you want to know if Ent1 is in front of Ent2 or behind. Just calculate the "view" vector of Ent2, that is a vector (say of length 1) pointing in front of Ent2. This can be done by two lines:

Code:

---

vec_Set(temp, vector(1,0,0));
vec_rotate(temp, ent2.pan);

---

Then define a vector pointing from ent2 to ent1. One line of code:

Code:

---

vec_diff(temp2, ent1.x, ent2.x);

---

Of course temp2 has to be defined first. ;-) Last, just check the dot product:

Code:

---

if (vec_dot(temp,temp2) > 0)
{ // Ent1 is in front of Ent2
...
}
else
{ // Ent1 is behind Ent2
...
}

---

And that's it. Three lines and then a test.

Regards,
Gnometech

Wow!
I needed other 6 hours to get my code run which is 14 lines long and than you come with i code which is nearly 1/4 of mine and seems to be very smiple

I made it like that:
Code:

---

	Playerpos_rel.x = my.x - LeiterP.x; //Calculates the relative Playerposition in x direction
	Playerpos_rel.y = my.y - LeiterP.y; //Calculates the relative Playerposition in y direction
	if(sin(Leiter_pan) != 0 && sin(Leiter_pan) != 1 && sin(Leiter_pan) != -1) //Leiter_pan != ...,-180,-90,0,90,180,...
	{
		if((Playerpos_rel.y/tan(Leiter_pan)) > LeiterP.x) {Vorderbei = 1;} //Playerentity is in front
	}
	if(sin(Leiter_pan) == 0) //Leiter_pan == 0,180,...
	{
		if(my.y < LeiterP.y) {Vorderbei = 1;} //Playerentity is in front
	}
	if(sin(Leiter_pan) == 1 || sin(Leiter_pan) == -1) //Leiter_pan == ...,-90,90,...
	{
		if(my.x > LeiterP.x) {Vorderbei = 1;} //Playerentity is in front
	}

---

Dark_samurai