diff options
Diffstat (limited to 'include/smmath.hpp')
| -rw-r--r-- | include/smmath.hpp | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/smmath.hpp b/include/smmath.hpp index 805df50..5172772 100644 --- a/include/smmath.hpp +++ b/include/smmath.hpp @@ -2,7 +2,6 @@ /* * Simple MultimEdia LiTerator(SMELT) * by Chris Xiong 2015 - * api level 1 * Math header & implementation * * WARNING: This library is in development and interfaces would be very @@ -105,6 +104,16 @@ public: tmp[3][3]=1; *this=*this*tmp; } + void lookat(double *eye,double *at,double *up) + { + smvec3d f=smvec3d(at[0],at[1],at[2])-smvec3d(eye[0],eye[1],eye[2]);f.normalize(); + smvec3d UP=smvec3d(up[0],up[1],up[2]);UP.normalize(); + smvec3d s=f*UP;smvec3d u=s.getNormalized()*f; + *this[0][0]= s.x;*this[1][0]= s.y;*this[2][0]= s.z;*this[3][0]=0; + *this[0][1]= u.x;*this[1][1]= u.y;*this[2][1]= u.z;*this[3][1]=0; + *this[0][2]=-f.x;*this[1][2]=-f.y;*this[2][2]=-f.z;*this[3][2]=0; + *this[0][3]= 0;*this[1][3]= 0;*this[2][3]= 0;*this[3][3]=1; + } friend smMatrix operator *(smMatrix a,smMatrix b) { smMatrix ret; |