Thread: [ggt-devel] problems using GMTL

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Hello there,

I am trying to use GMTL in my application,
but I am running into a lot of problems.
A lot of the examples in the FAQ do not seem to work.
I include gmtl.h, so that should cover everything, right?

Ok, so, where to start. First of all; extracting rotation/translation information from a matrix doesn't work properly.

The FAQ states:

"You can extract the rotational data as any of GMTL's rotation data types. In any case, you need to use the makeRot templated function. Note that you need to specify which rotation data type you want to extract."

followed by four examples.

Two of these examples do not work; extracting the rotation in euler angles or quaternions works, but trying to get axis angles or a matrix fails. 

myAxisAngle = gmtl::makeRot< gmtl::AxisAnglef >( mymat )

results in 19 errors on that line.

Error 1 error C2784: 'gmtl::Coord<POS_TYPE,ROT_TYPE> &gmtl::set(gmtl::Coord<POS_TYPE,ROT_TYPE> &,const gmtl::Matrix<DATATYPE,MATROWS,MATCOLS> &)' : could not deduce template argument for 'gmtl::Coord<POS_TYPE,ROT_TYPE> &' from 'gmtl::AxisAnglef' C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 1323 
Error 2 error C2784: 'gmtl::Coord<POS_TYPE,ROT_TYPE> &gmtl::set(gmtl::Coord<POS_TYPE,ROT_TYPE> &,const gmtl::Matrix<DATATYPE,MATROWS,MATCOLS> &)' : could not deduce template argument for 'gmtl::Coord<POS_TYPE,ROT_TYPE> &' from 'gmtl::AxisAnglef' C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 1323 
Error 3 error C2784: 'gmtl::Matrix<DATA_TYPE,ROWS,COLS> &gmtl::set(gmtl::Matrix<DATA_TYPE,ROWS,COLS> &,const gmtl::Quat<DATA_TYPE> &)' : could not deduce template argument for 'gmtl::Matrix<DATA_TYPE,ROWS,COLS> &' from 'gmtl::AxisAnglef' C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 1323 
...and so on...

myRotationMat = gmtl::makeRot< gmtl::Matrix44f >( mymat );

results in similar errors

Secondly, the makeTrans function works for Point3f and Vec3f, but not for Matrix44f. The following code:

gmtl::Matrix44f matrix1;
gmtl::Matrix44f matrix2;
matrix2 = gmtl::makeTrans< gmtl::Matrix44f >( matrix1 );

results in the following errors:

Error 1 error C2039: 'Size' : is not a member of 'gmtl::Matrix<DATA_TYPE,ROWS,COLS>' C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 122 
Error 2 error C2065: 'Size' : undeclared identifier C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 122 
Error 3 error C2039: 'Size' : is not a member of 'gmtl::Matrix<DATA_TYPE,ROWS,COLS>' C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 123 
Error 4 error C2039: 'Size' : is not a member of 'gmtl::Matrix<DATA_TYPE,ROWS,COLS>' C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 125 
Error 5 error C2679: binary '=' : no operator found which takes a right-hand operand of type 'const float' (or there is no acceptable conversion) C:\Program Files\VR Juggler 2.2.0\include\gmtl\Generate.h 134 

The 3rd problem I encountered is the rotating of vectors.
The FAQ says:
 "In most cases you can simply use the * operator with your vector and one of the rotaional data types."

So I tried that, with the provided sample code:

 gmtl::Vec3f myVec;
 gmtl::AxisAnglef myAA;
 gmtl::Quatf myQuat;
 gmtl::Matrix44f myMat;
 gmtl::EulerAngleXYZf myEuler;

 myVec = myVec * myAA;
 myVec = myVec * myQuat;
 myVec = myVec * myMat;
 myVec = myVec * myEuler;

This results in >100 errors, all of type C2784 ("could not deduce template argument for....")

I'm clueless here, I am trying to use the GMTL library for basic math operations, but just about everything I try to do, fails.

Can someone help me out?

- Wouter