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API Reference: LMatrix3f
LMatrix3f
from pandac.PandaModules import LMatrix3f
Class : LMatrix3
Description : This is a 3-by-3 transform matrix. It typically will represent either a rotation-and-scale (no translation) matrix in 3-d, or a full affine matrix (rotation, scale, translation) in 2-d, e.g. for a texture matrix.
Inheritance:
Methods of LMatrix3f:
LMatrix3f
LMatrix3f::LMatrix3f(void);
Description:
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addHash
unsigned int LMatrix3f::add_hash(unsigned int hash) const;
Description: Adds the vector into the running hash.
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almostEqual
bool LMatrix3f::almost_equal(LMatrix3f const &other, float threshold) const;
We don't have a scale_mat() that takes a single uniform scale parameter, because it would be ambiguous whether we mean a 2-d or a 3-d scale.
Description: Returns true if two matrices are memberwise equal within a default tolerance based on the numeric type.
Description: Returns true if two matrices are memberwise equal within a specified tolerance.
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compareTo
int LMatrix3f::compare_to(LMatrix3f const &other) const;
Description: This flavor of compare_to uses a default threshold value based on the numeric type.
Description: Sorts matrices lexicographically, componentwise. Returns a number less than 0 if this matrix sorts before the other one, greater than zero if it sorts after, 0 if they are equivalent (within the indicated tolerance).
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convertMat
static LMatrix3f const &LMatrix3f::convert_mat(CoordinateSystem from, CoordinateSystem to);
Description: Returns a matrix that transforms from the indicated coordinate system to the indicated coordinate system.
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determinant
float LMatrix3f::determinant(void) const;
Description: Returns the determinant of the matrix.
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fill
void LMatrix3f::fill(float fill_value);
Description: Sets each element of the matrix to the indicated fill_value. This is of questionable value, but is sometimes useful when initializing to zero.
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getCell
float LMatrix3f::get_cell(int row, int col) const;
Description: Returns a particular element of the matrix.
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getCol
LVecBase3f LMatrix3f::get_col(int col) const;
Description: Returns the indicated column of the matrix as a three-component vector.
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getCol2
LVecBase2f LMatrix3f::get_col2(int col) const;
Description: Returns the indicated column of the matrix as a two-component vector, ignoring the last row.
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getData
float const *LMatrix3f::get_data(void) const;
Description: Returns the address of the first of the nine data elements in the matrix. The remaining elements occupy the next eight positions in row-major order.
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getHash
unsigned int LMatrix3f::get_hash(void) const;
Description: Returns a suitable hash for phash_map.
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getNumComponents
int LMatrix3f::get_num_components(void) const;
Description: Returns the number of elements in the matrix, nine.
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getRow
LVecBase3f LMatrix3f::get_row(int row) const;
these versions inline better
Description: Returns the indicated row of the matrix as a three-component vector.
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getRow2
LVecBase2f LMatrix3f::get_row2(int row) const;
Description: Returns the indicated row of the matrix as a two-component vector, ignoring the last column.
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identMat
static LMatrix3f const &LMatrix3f::ident_mat(void);
Description: Returns an identity matrix.
This function definition must appear first, since some inline functions below take advantage of it.
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invertFrom
bool LMatrix3f::invert_from(LMatrix3f const &other);
Description: Computes the inverse of the other matrix, and stores the result in this matrix. This is a fully general operation and makes no assumptions about the type of transform represented by the matrix.
The other matrix must be a different object than this matrix. However, if you need to invert a matrix in place, see invert_in_place.
The return value is true if the matrix was successfully inverted, false if the was a singularity.
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invertInPlace
bool LMatrix3f::invert_in_place(void);
Description: Inverts the current matrix. Returns true if the inverse is successful, false if the matrix was singular.
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invertTransposeFrom
bool LMatrix3f::invert_transpose_from(LMatrix3f const &other);
Description: Simultaneously computes the inverse of the indicated matrix, and then the transpose of that inverse.
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isNan
bool LMatrix3f::is_nan(void) const;
Description: Returns true if any component of the matrix is not-a-number, false otherwise.
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multiply
void LMatrix3f::multiply(LMatrix3f const &other1, LMatrix3f const &other2);
this = other1 * other2
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operator !=
bool LMatrix3f::operator !=(LMatrix3f const &other) const;
Description:
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operator ()
float &LMatrix3f::operator ()(int row, int col);
Description:
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operator *
LMatrix3f LMatrix3f::operator *(LMatrix3f const &other) const;
Description:
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operator *=
LMatrix3f &LMatrix3f::operator *=(LMatrix3f const &other);
Description:
Description: Performs a memberwise scale.
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operator +=
LMatrix3f &LMatrix3f::operator +=(LMatrix3f const &other);
Description: Performs a memberwise addition between two matrices.
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operator -=
LMatrix3f &LMatrix3f::operator -=(LMatrix3f const &other);
Description: Performs a memberwise subtraction between two matrices.
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operator /
LMatrix3f LMatrix3f::operator /(float scalar) const;
Description:
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operator /=
LMatrix3f &LMatrix3f::operator /=(float scalar);
Description: Performs a memberwise scale.
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operator <
bool LMatrix3f::operator <(LMatrix3f const &other) const;
Description: This performs a lexicographical comparison. It's of questionable mathematical meaning, but sometimes has a practical purpose for sorting unique vectors, especially in an STL container. Also see compare_to().
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operator =
LMatrix3f &LMatrix3f::operator =(LMatrix3f const &other);
Description:
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operator ==
bool LMatrix3f::operator ==(LMatrix3f const &other) const;
Description:
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operator []
LMatrix3f::CRow LMatrix3f::operator [](int i) const;
Description:
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operator delete
void LMatrix3f::operator delete(void *ptr);
Undocumented function.
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operator new
void *LMatrix3f::operator new(unsigned int size);
Undocumented function.
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pythonRepr
void LMatrix3f::python_repr(ostream &out, string const &class_name) const;
Description:
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rotateMat
static LMatrix3f LMatrix3f::rotate_mat(float angle);
Description: Returns a matrix that rotates by the given angle in degrees counterclockwise.
Description: Returns a matrix that rotates by the given angle in degrees counterclockwise about the indicated vector.
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rotateMatNormaxis
static LMatrix3f LMatrix3f::rotate_mat_normaxis(float angle, LVecBase3f const &axis, CoordinateSystem cs = (CS_default));
Description: Returns a matrix that rotates by the given angle in degrees counterclockwise about the indicated vector. Assumes axis has been normalized.
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scaleMat
static LMatrix3f LMatrix3f::scale_mat(LVecBase2f const &scale);
Description: Returns a matrix that applies the indicated scale in each of the two axes.
Description: Returns a matrix that applies the indicated scale in each of the three axes.
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set
void LMatrix3f::set(float e00, float e01, float e02, float e10, float e11, float e12, float e20, float e21, float e22);
Description:
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setCell
void LMatrix3f::set_cell(int row, int col, float value);
Description: Changes a particular element of the matrix.
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setCol
void LMatrix3f::set_col(int col, LVecBase3f const &v);
Description: Replaces the indicated column of the matrix from a three-component vector.
Description: Replaces the indicated column of the matrix from a two-component vector, ignoring the last row.
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setRotateMat
void LMatrix3f::set_rotate_mat(float angle);
The following named constructors return 3x3 matrices suitable for scale/rotate transforms in 3-d coordinate space.
Description: Fills mat with a matrix that rotates by the given angle in degrees counterclockwise.
Description: Fills mat with a matrix that rotates by the given angle in degrees counterclockwise about the indicated vector.
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setRotateMatNormaxis
void LMatrix3f::set_rotate_mat_normaxis(float angle, LVecBase3f const &axis, CoordinateSystem cs = (CS_default));
Description: Fills mat with a matrix that rotates by the given angle in degrees counterclockwise about the indicated vector. Assumes axis has been normalized.
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setRow
void LMatrix3f::set_row(int row, LVecBase3f const &v);
Description: Replaces the indicated row of the matrix from a three-component vector.
Description: Replaces the indicated row of the matrix from a two-component vector, ignoring the last column.
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setScaleMat
void LMatrix3f::set_scale_mat(LVecBase2f const &scale);
Description: Fills mat with a matrix that applies the indicated scale in each of the two axes.
Description: Fills mat with a matrix that applies the indicated scale in each of the three axes.
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setShearMat
void LMatrix3f::set_shear_mat(LVecBase3f const &shear, CoordinateSystem cs = (CS_default));
Description: Fills mat with a matrix that applies the indicated shear in each of the three planes.
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setTranslateMat
void LMatrix3f::set_translate_mat(LVecBase2f const &trans);
Description: Fills mat with a matrix that applies the indicated translation.
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shearMat
static LMatrix3f LMatrix3f::shear_mat(LVecBase3f const &shear, CoordinateSystem cs = (CS_default));
Description: Returns a matrix that applies the indicated shear in each of the three planes.
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size
static int LMatrix3f::size(void);
Description: Returns 3: the number of rows of a LMatrix3.
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translateMat
static LMatrix3f LMatrix3f::translate_mat(LVecBase2f const &trans);
Description: Returns a matrix that applies the indicated translation.
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transposeFrom
void LMatrix3f::transpose_from(LMatrix3f const &other);
Description:
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validatePtr
static bool LMatrix3f::validate_ptr(void const *ptr);
Undocumented function.
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write
void LMatrix3f::write(ostream &out, int indent_level = (0)) const;
Description:
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xformPoint
LVecBase2f LMatrix3f::xform_point(LVecBase2f const &v) const;
Description: The matrix transforms a 2-component point (including translation component) and returns the result. This assumes the matrix is an affine transform.
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xformVec
LVecBase2f LMatrix3f::xform_vec(LVecBase2f const &v) const;
Description: The matrix transforms a 2-component vector (without translation component) and returns the result. This assumes the matrix is an affine transform.
Description: The matrix transforms a 3-component vector and returns the result. This assumes the matrix is an orthonormal transform.
In practice, this is the same computation as xform().
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xformVecGeneral
LVecBase3f LMatrix3f::xform_vec_general(LVecBase3f const &v) const;
Description: The matrix transforms a 3-component vector (without translation component) and returns the result, as a fully general operation.
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