Please some one help me with orientation !!!
Author
Hi Guys, my question is really easy, but i''m so dumb in math that i can''t figure it out !!!
i have two objects in my game -enemy and player-, i want the enemy to be drawn to the orientation of the player ... that''s it ...
i have the x,y,z positon of both the enemy and the player ... what i need is a function that would rotate the enemy so that when i draw it it would look like as if it was heading for the player -not moving to the right while it''s face is drawn to the back- ...
please help me ...
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i can tell how much u like math from your signature 
i didn''t get what you want exactly, but if u want to place the enemy infront of the player on a distance s.
you should have a vector of position for both. a heading vector for the player and the distance you want to place the enemy in.
player pos = vp;
player heading = vph;
distance = s;
FindEnemyPos()
{
vph_temp= Normalize(vph);
vph_temp= Scale(vph_temp, s);
EnemyPos= Add(vph_temp,vp);
}
hope that hits the spot ...
"The Railgun Master"
DaHeR
i didn''t get what you want exactly, but if u want to place the enemy infront of the player on a distance s.
you should have a vector of position for both. a heading vector for the player and the distance you want to place the enemy in.
player pos = vp;
player heading = vph;
distance = s;
FindEnemyPos()
{
vph_temp= Normalize(vph);
vph_temp= Scale(vph_temp, s);
EnemyPos= Add(vph_temp,vp);
}
hope that hits the spot ...
"The Railgun Master"
DaHeR
Author
Thanks daher ...
but maybe i was not clear enough ... what i want is that when i render the enemy -which is a tank- i want it to be drawn as if it's pointed at me ... you know what i mean ...
just imagine that the tank is moving towards me ... i want to rotate it so that it's turret is directed to me ... i just want the function to calculate the amount of degrees i have to rotate it ...
|
| | /
|
------------
|
x | -
|
where x is the player, and the | and - and / are the enemy ... you see the oriantation ....
thanks ...
Edited by - fixxxer on January 9, 2002 3:23:03 PM
but maybe i was not clear enough ... what i want is that when i render the enemy -which is a tank- i want it to be drawn as if it's pointed at me ... you know what i mean ...
just imagine that the tank is moving towards me ... i want to rotate it so that it's turret is directed to me ... i just want the function to calculate the amount of degrees i have to rotate it ...
|
| | /
|
------------
|
x | -
|
where x is the player, and the | and - and / are the enemy ... you see the oriantation ....
thanks ...
Edited by - fixxxer on January 9, 2002 3:23:03 PM
not to sound rude but if you goto gamedev.net''s forums in there math section i am sure someone there can give you some code to find angles between 2 points.. i have some code but its written in another programming language. if you wanna convert it let me now and i can post it. its only a handfull of lines.
http://www.lectersoft.com
http://www.lectersoft.com
//what the hell here it is anyway
the values with the # are floats
function ca(px1#,py1#,px2#,py2#)
dx#=px2#-px1#
dy#=py2#-py1#
quadflag=0
if dx#<0 then dx#=dx#*-1 : inc quadflag
if dy# < 0 then dy#=dy#*-1 : quadflag= quadflag+2
if dx# <> 0
angle#=ATAN(dy#/dx#)
else
angle#=ATAN(dy#)
endif
if quadflag=1 then angle# = 180-angle#
if quadflag=2 then angle# = 360-angle#
if quadflag=3 then angle# = 180+angle#
if angle# > 0 then angle# =int(angle# +.50)
endfunction angle#
the values with the # are floats
function ca(px1#,py1#,px2#,py2#)
dx#=px2#-px1#
dy#=py2#-py1#
quadflag=0
if dx#<0 then dx#=dx#*-1 : inc quadflag
if dy# < 0 then dy#=dy#*-1 : quadflag= quadflag+2
if dx# <> 0
angle#=ATAN(dy#/dx#)
else
angle#=ATAN(dy#)
endif
if quadflag=1 then angle# = 180-angle#
if quadflag=2 then angle# = 360-angle#
if quadflag=3 then angle# = 180+angle#
if angle# > 0 then angle# =int(angle# +.50)
endfunction angle#
Author
dfawcett ... you are the greatest 
... thanks dude ... you know earth is a great place to live because of people like you ...
thanks again ... i will try that ... but i think it''s what i need because it''s excatly what i thought of ...
thanks man ...
... thanks dude ... you know earth is a great place to live because of people like you ...thanks again ... i will try that ... but i think it''s what i need because it''s excatly what i thought of ...
thanks man ...
Author
This is how i convert .. why it doesn''t work ...
float dx = wx_pos - player.wx_pos;
float dy = wy_pos - player.wy_pos;
int quadflag=0;
if (dx < 0)
{
dx = dx * -1;
quadflag ++;
}
if (dy < 0)
{
dy = dy * -1;
quadflag += 2;
}
if (dx != 0)
cTanksceneroty = atan(dy/dx);
else
cTanksceneroty = atan(dy);
if (quadflag == 1)
cTanksceneroty = 180-cTanksceneroty;
if (quadflag == 2)
cTanksceneroty = 360-cTanksceneroty;
if (quadflag == 3)
cTanksceneroty = 180+cTanksceneroty;
if (cTanksceneroty > 0)
cTanksceneroty = int(cTanksceneroty +.50);
glRotatef(cTanksceneroty,0,1.0f,0);
float dx = wx_pos - player.wx_pos;
float dy = wy_pos - player.wy_pos;
int quadflag=0;
if (dx < 0)
{
dx = dx * -1;
quadflag ++;
}
if (dy < 0)
{
dy = dy * -1;
quadflag += 2;
}
if (dx != 0)
cTanksceneroty = atan(dy/dx);
else
cTanksceneroty = atan(dy);
if (quadflag == 1)
cTanksceneroty = 180-cTanksceneroty;
if (quadflag == 2)
cTanksceneroty = 360-cTanksceneroty;
if (quadflag == 3)
cTanksceneroty = 180+cTanksceneroty;
if (cTanksceneroty > 0)
cTanksceneroty = int(cTanksceneroty +.50);
glRotatef(cTanksceneroty,0,1.0f,0);
Maybe there''s a problem with angle units.
I guess atan return the angle in radians, so you shouldn''t
add/substract 180 or 360 but PI or 2*PI, or convert the
result of atan().
And ya also have to make sure the unit is correct when
using glRotate !
I guess atan return the angle in radians, so you shouldn''t
add/substract 180 or 360 but PI or 2*PI, or convert the
result of atan().
And ya also have to make sure the unit is correct when
using glRotate !
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