[Newton 2.0] Simple formula

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[Newton 2.0] Simple formula

Postby frankk » Mon Nov 03, 2008 7:36 pm

Hi,

it's me again but this time, I do not wanna ask you about the custommultibody vehicle.
I just wanna know a simple formula :

How to determine the main axis (direction) of a 3D body out of the matrix that newton gives us. This direction must also be relative to something, but how to calculate it ?

Thanks in advance for taking time to answer to this simple newbie 3D question.
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Re: [Newton 2.0] Simple formula

Postby frankk » Tue Nov 04, 2008 11:02 am

In other words, how to get the yaw, pitch and roll ?
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Re: [Newton 2.0] Simple formula

Postby Julio Jerez » Tue Nov 04, 2008 11:30 am

That depend, what do you need it for?
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Re: [Newton 2.0] Simple formula

Postby JernejL » Tue Nov 04, 2008 1:27 pm

Perhaps NewtonGetEulerAngle is what you need.
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Re: [Newton 2.0] Simple formula

Postby Dave Gravel » Tue Nov 04, 2008 10:35 pm

If you need it from the matrix you can do it like this.
I don't have test it with all situation but working good for me.

Code: Select all
function GetMatrixTurnAngle(mat: Tmatrix): single;
begin
  result :=radtodeg(-arctan2(-mat[2,0], mat[0,0]));
end;

function GetMatrixPitchAngle(mat: Tmatrix): single;
begin
  result :=radtodeg(-arctan2(-mat[1,2], mat[1,1]));
end;

function GetMatrixRollAngle(mat: Tmatrix): single;
begin
  result :=radtodeg(-arcsin(mat[1,0]));
end;
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