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Quote:
Originally Posted by Falco-Ger
Hey guys, i read the page about the quatrions but i'm not a math genious. I simple want 3 vectors from those 4 numbers which i don't really understand.
Those 3 vectors should have length 1 and have this formation (x, y, z)
Here is a picture explaining what i mean.
Maybe something like
GetVehicleXVector(vehicleid, &Float  , &Float:y, &Float:z)
GetVehicleYVector(vehicleid, &Float , &Float:y, &Float:z)
GetVehicleZVector(vehicleid, &Float , &Float:y, &Float:z)
would be nice |
I have a thread which discusses the quaternion things, I think it was in discussion, just check out my profile and threads started by me.
Also sa-mp does have an function to get the 4 quads:
https://sampwiki.blast.hk/wiki/GetVehicleRotationQuat
sounds like the problem located here:
http://www.ogre3d.org/forums/viewtopic.php?p=317662
This could help:
http://www.genesis3d.com/~kdtop/Quat...ntRotation.htm
and instead of vectors you can use a 3d matrix, i have somewhere some code which converts quads to 3x3 and 4x4 matrix.
(for PAWN ofcourse)
I;m not able to locate the code but I could reconstruct it if it could be usefull to you.
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i know the function GetVehicleRotationQuat, the problem is that i can not use those numbers, i need the vectors
and as i said i'm no genious, i don't understand the stuff in those links, it would be best if somebody just gives me the function i think...
i serched through your threads but nothing usefull there, only vehicle stats (left, right, normal, upside down) concerning VehicleRotationQuat
I don't know if a 3x3 matrix would help, maybe thats just those 3 vectors i look for?
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Well the code for getting the matrix can be this:
pawn Код:
#include <a_samp>
forward Float:QuatTo3x3Matrix(Float:w,Float:x,Float:y,Float:z);
stock Float:QuatTo3x3Matrix(Float:w,Float:x,Float:y,Float:z)
{
new Float:Matrix[3][3];
Matrix[0][0] = 1 - (2*(y*y)) - (2*(z*z)); Matrix[0][1] = (2 * x * y) - (2 * z * w); Matrix[0][2] = (2*x*z)+(2*y*w);
Matrix[1][0] = ( 2*x*y ) + ( 2 * z * w ); Matrix[1][1] = 1 - (2*x*x) - (2* z * z ); Matrix[1][2] = (2*y*z)-(2*x*w);
Matrix[2][0] = ( 2*x*y ) - ( 2 * y * w ); Matrix[2][1] = (2*y* z ) + ( 2 * x * w ); Matrix[2][2] = 1 - (2*(x*x)) - (2*(y*y));
return Matrix;
}
public OnFilterScriptInit()
{
new Float:test[3][3];
test = QuatTo3x3Matrix(0.0,0.0,0.0,0.0);
return 1;
}
//http://www.euclideanspace.com/maths/geometry/rotations/conversions/quaternionToMatrix/index.htm
then using the matrix you're gonna get the vectors:
http://www.facstaff.bucknell.edu/mas...ecMultiply.htm
(or just ******: matrix to vector)
I'm also no expert at quaternions (however I'm looking for a maths teacher who can teach it to me), but I try to help you as hard as I can.
page 7+ from this pdf explain very much:
http://www.euclideanspace.com/maths/...raining001.pdf
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Posts: 1,047
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Joined: Jun 2009
No but I can reconstruct it (hopefully...) , well when I will be done making it I'll let ya know.
Umm..
Quote:
Originally Posted by Kar
|
Which function(s) should he use? :S
pawn Код:
#include <a_samp>
public OnFilterScriptInit()
{
new Float:test[4][4];
test = setRotate(0.0,0.0,0.0,0.0,0.0,0.0);
return 1;
}
forward Float:setRotate(Float:q_w,Float:q_x,Float:q_y,Float:q_z,Float:q1_x,Float:q1_y,Float:centre_x = 0.0,Float:centre_y = 0.0,Float:centre_z = 0.0);
stock Float:setRotate(Float:q_w,Float:q_x,Float:q_y,Float:q_z,Float:q1_x,Float:q1_y,Float:centre_x = 0.0,Float:centre_y = 0.0,Float:centre_z = 0.0)
{
new Float: sqw = q_w*q_w;
new Float: sqx = q_x*q_x;
new Float: sqy = q_y*q_y;
new Float: sqz = q_z*q_z;
new Float: m00 = sqx - sqy - sqz + sqw; // since sqw + sqx + sqy + sqz =1
new Float: m11 = -sqx + sqy - sqz + sqw;
new Float: m22 = -sqx - sqy + sqz + sqw;
new Float: tmp1 = q_x*q_y;
new Float: tmp2 = q_z*q_w;
new Float: m01 = 2.0 * (tmp1 + tmp2);
new Float: m10 = 2.0 * (tmp1 - tmp2);
tmp1 = q_x*q_z;
tmp2 = q_y*q_w;
new Float: m02 = 2.0 * (tmp1 - tmp2);
new Float: m20 = 2.0 * (tmp1 + tmp2);
tmp1 = q1_y*q_z;
tmp2 = q1_x*q_w;
new Float: m12 = 2.0 * (tmp1 + tmp2);
new Float: m21 = 2.0 * (tmp1 - tmp2);
new Float:a1,Float:a2,Float:a3;
if (centre_x && centre_y && centre_z == 0.0)
{
a1 = a2=a3=0.0;
}
else
{
a1 = centre_x;
a2 = centre_y;
a3 = centre_z;
}
new Float: m03 = a1 - a1 * m00 - a2 * m01 - a3 * m02;
new Float: m13 = a2 - a1 * m10 - a2 * m11 - a3 * m12;
new Float: m23 = a3 - a1 * m20 - a2 * m21 - a3 * m22;
new Float: m31, Float: m32;
new Float: m30 = m31 = m32 = 0.0;
new Float: m33 = 1.0;
new Float: fxfMatrix[4][4];
fxfMatrix[0][0] = m00;
fxfMatrix[0][1] = m01;
fxfMatrix[0][2] = m02;
fxfMatrix[0][3] = m03;
fxfMatrix[1][0] = m10;
fxfMatrix[1][1] = m11;
fxfMatrix[1][2] = m12;
fxfMatrix[1][3] = m13;
fxfMatrix[2][0] = m20;
fxfMatrix[2][1] = m21;
fxfMatrix[2][2] = m22;
fxfMatrix[2][3] = m23;
fxfMatrix[3][0] = m30;
fxfMatrix[3][1] = m31;
fxfMatrix[3][2] = m32;
fxfMatrix[3][3] = m33;
return fxfMatrix;
}
dunno if that's the right code, converted it from:
pawn Код:
void setRotate(sfquat q,sfvec3f centre) {
double sqw = q.w*q.w;
double sqx = q.x*q.x;
double sqy = q.y*q.y;
double sqz = q.z*q.z;
m00 = sqx - sqy - sqz + sqw; // since sqw + sqx + sqy + sqz =1
m11 = -sqx + sqy - sqz + sqw;
m22 = -sqx - sqy + sqz + sqw;
double tmp1 = q.x*q.y;
double tmp2 = q.z*q.w;
m01 = 2.0 * (tmp1 + tmp2);
m10 = 2.0 * (tmp1 - tmp2);
tmp1 = q.x*q.z;
tmp2 = q.y*q.w;
m02 = 2.0 * (tmp1 - tmp2);
m20 = 2.0 * (tmp1 + tmp2);
tmp1 = q1.y*q.z;
tmp2 = q1.x*q.w;
m12 = 2.0 * (tmp1 + tmp2);
m21 = 2.0 * (tmp1 - tmp2);
double a1,a2,a3;
if (centre == null) {
a1=a2=a3=0;
} else {
a1 = centre.x;
a2 = centre.y;
a3 = centre.z;
}
m03 = a1 - a1 * m00 - a2 * m01 - a3 * m02;
m13 = a2 - a1 * m10 - a2 * m11 - a3 * m12;
m23 = a3 - a1 * m20 - a2 * m21 - a3 * m22;
m30 = m31 = m32 = 0.0;
m33 = 1.0;
}
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26.10.2011, 13:39
(
Последний раз редактировалось Falco-Ger; 26.10.2011 в 15:27.
)
thank you, that should do. i got a friend who told me that he could rotate a vector pointing downwards (which is simply (0,0,-1)) around with that 4x4 matrix... i hope he can, but unfortunatualy he is very bussy at the moment so that might take some time
those vectors can be used to find offset positions around vehicles and direction vectors for the CreateGravityAffectedObject(model, x, y, z, xspeed, yspeed, zspeed, multiplier) function i am making
also those vectors can be used to create speed vectors that go to a specific direction from the vehicle (like the flares i want to make, poping in pairs left and right out of the plane)
Posts: 1,047
Threads: 23
Joined: Jun 2009
Quote:
Originally Posted by Falco-Ger
thank you, that should do. i got a friend who told me that he could rotate a vector pointing downwards (which is simply (0,0,-1)) around with that 4x4 matrix... i hope he can, but unfortunatualy he is very bussy at the moment so that might take some time
those vectors can be used to find offset positions around vehicles and direction vectors for the CreateGravityAffectedObject(model, x, y, z, xspeed, yspeed, zspeed, multiplier) function i am making
also those vectors can be used to create speed vectors that go to a specific direction from the vehicle (like the flares i want to make, poping in pairs left and right out of the plane)
|
Yep quaternions are used in spacecraft heading calculations and many more, however that goes beyond my passion, I'll just stick with the goal that I'll become an public airline pilot.
