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From Tim Daust, "I fixed the getScale functions in matrixf and

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matrixd.  It was returning the values of the diagonal
of the matrix, which only returns the scale if there
is not a rotation.  I fixed this by returning the
length of the  vectors that form the basis.
  I also added a function to orthonormalize the
rotation component of the matrix. I seem to always run
into situations where non uniform (or even uniform)
scale complicate my calculations, and I thought other
members of the community could use this function as
well."
This commit is contained in:
Robert Osfield
2005-05-31 06:21:16 +00:00
parent 5a5b39fee3
commit a799cdca2f
3 changed files with 86 additions and 4 deletions
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10
include/osg/Matrixf
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@@ -206,6 +206,9 @@ class OSG_EXPORT Matrixf
/** full 4x4 matrix invert. */
bool invert_4x4_new( const Matrixf& );
/** ortho-normalize the 3x3 rotation & scale matrix */
void orthoNormalize(const Matrixf& rhs);
//basic utility functions to create new matrices
inline static Matrixf identity( void );
inline static Matrixf scale( const Vec3f& sv);
@@ -288,7 +291,12 @@ class OSG_EXPORT Matrixf
inline Vec3d getTrans() const { return Vec3d(_mat[3][0],_mat[3][1],_mat[3][2]); }
inline Vec3d getScale() const { return Vec3d(_mat[0][0],_mat[1][1],_mat[2][2]); }
inline Vec3d getScale() const {
Vec3d x_vec(_mat[0][0],_mat[1][0],_mat[2][0]);
Vec3d y_vec(_mat[0][1],_mat[1][1],_mat[2][1]);
Vec3d z_vec(_mat[0][2],_mat[1][2],_mat[2][2]);
return Vec3d(x_vec.length(), y_vec.length(), z_vec.length());
}
/** apply a 3x3 transform of v*M[0..2,0..2]. */
inline static Vec3f transform3x3(const Vec3f& v,const Matrixf& m);