Panda3D
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LPlanef Class Reference

An abstract mathematical description of a plane. More...

Inheritance diagram for LPlanef:
LVecBase4f

Public Member Functions

 __init__ ()
 Creates a default plane. More...
 
 __init__ (const LPlanef)
 
 __init__ (const LPoint3f a, const LPoint3f b, const LPoint3f c)
 Constructs a plane given three counter-clockwise points, as seen from the front of the plane (that is, viewed from the end of the normal vector, looking down). More...
 
 __init__ (const LVecBase4f copy)
 
 __init__ (const LVector3f normal, const LPoint3f point)
 Constructs a plane given a surface normal vector and a point within the plane. More...
 
 __init__ (float a, float b, float c, float d)
 Constructs a plane given the four terms of the plane equation. More...
 
float distToPlane (const LPoint3f point)
 Returns the straight-line shortest distance from the point to the plane. More...
 
 flip ()
 Convenience method that flips the plane in-place. More...
 
LVector3f getNormal ()
 Returns the surface normal of the plane. More...
 
LPoint3f getPoint ()
 Returns an arbitrary point in the plane. More...
 
LMatrix4f getReflectionMat ()
 This computes a transform matrix that reflects the universe to the other side of the plane, as in a mirror. More...
 
bool intersectsLine (LPoint3f intersection_point, const LPoint3f p1, const LPoint3f p2)
 Returns true if the plane intersects the infinite line passing through points p1 and p2, false if the line is parallel. More...
 
bool intersectsPlane (LPoint3f from, LVector3f delta, const LPlanef other)
 Returns true if the two planes intersect, false if they do not. More...
 
bool normalize ()
 Normalizes the plane in place. More...
 
LPlanef normalized ()
 Normalizes the plane and returns the normalized plane as a copy. More...
 
LPlanef operator * (const LMatrix3f mat)
 
LPlanef operator * (const LMatrix4f mat)
 
LPlanef operator *= (const LMatrix4f mat)
 
LPlanef operator - ()
 
 output (Ostream out)
 
LPoint3f project (const LPoint3f point)
 Returns the point within the plane nearest to the indicated point in space. More...
 
 write (Ostream out, int indent_level)
 
 xform (const LMatrix4f mat)
 Transforms the plane by the indicated matrix. More...
 
- Public Member Functions inherited from LVecBase4f
object __getattr__ (str attr_name)
 
 __init__ ()
 
 __init__ (const LPoint3f point)
 Constructs an LVecBase4 from an LPoint3. More...
 
 __init__ (const LVecBase3f copy, float w)
 
 __init__ (const LVecBase4f)
 
 __init__ (const LVector3f vector)
 Constructs an LVecBase4 from an LVector3. More...
 
 __init__ (const UnalignedLVecBase4f copy)
 
 __init__ (float fill_value)
 
 __init__ (float x, float y, float z, float w)
 
object __ipow__ (float exponent)
 
LVecBase4f __pow__ (float exponent)
 
object __reduce__ ()
 
str __repr__ ()
 
int __setattr__ (str attr_name, object assign)
 
int addHash (int hash)
 Adds the vector into the running hash. More...
 
int addHash (int hash, float threshold)
 Adds the vector into the running hash. More...
 
 addToCell (int i, float value)
 
 addW (float value)
 
 addX (float value)
 
 addY (float value)
 
 addZ (float value)
 
bool almostEqual (const LVecBase4f other)
 Returns true if two vectors are memberwise equal within a default tolerance based on the numeric type. More...
 
bool almostEqual (const LVecBase4f other, float threshold)
 Returns true if two vectors are memberwise equal within a specified tolerance. More...
 
int compareTo (const LVecBase4f other)
 This flavor of compare_to uses a default threshold value based on the numeric type. More...
 
int compareTo (const LVecBase4f other, float threshold)
 Sorts vectors lexicographically, componentwise. More...
 
 componentwiseMult (const LVecBase4f other)
 
float dot (const LVecBase4f other)
 
 fill (float fill_value)
 Sets each element of the vector to the indicated fill_value. More...
 
LVecBase4f fmax (const LVecBase4f other)
 
LVecBase4f fmin (const LVecBase4f other)
 
 generateHash (ChecksumHashGenerator hashgen)
 Adds the vector to the indicated hash generator. More...
 
 generateHash (ChecksumHashGenerator hashgen, float threshold)
 Adds the vector to the indicated hash generator. More...
 
float getCell (int i)
 
 getData ()
 Returns the address of the first of the four data elements in the vector. More...
 
int getHash ()
 Returns a suitable hash for phash_map. More...
 
int getHash (float threshold)
 Returns a suitable hash for phash_map. More...
 
float getW ()
 
float getX ()
 
LVecBase2f getXy ()
 Returns the x and y component of this vector. More...
 
LVecBase3f getXyz ()
 Returns the x, y and z component of this vector. More...
 
float getY ()
 
float getZ ()
 
bool isNan ()
 Returns true if any component of the vector is not-a-number, false otherwise. More...
 
float length ()
 Returns the length of the vector, by the Pythagorean theorem. More...
 
float lengthSquared ()
 Returns the square of the vector's length, cheap and easy. More...
 
bool normalize ()
 Normalizes the vector in place. More...
 
LVecBase4f normalized ()
 Normalizes the vector and returns the normalized vector as a copy. More...
 
bool operator != (const LVecBase4f other)
 
LVecBase4f operator * (float scalar)
 
LVecBase4f operator *= (float scalar)
 
LVecBase4f operator - ()
 
LVecBase4f operator - (const LVecBase4f other)
 
LVecBase4f operator -= (const LVecBase4f other)
 
 operator [] (int i, float assign_val)
 
float operator [] (int i)
 
 operator new (int size)
 
LVecBase4f operator+ (const LVecBase4f other)
 
LVecBase4f operator+= (const LVecBase4f other)
 
LVecBase4f operator/ (float scalar)
 
LVecBase4f operator/= (float scalar)
 
bool operator< (const LVecBase4f other)
 
LVecBase4f operator= (const LVecBase4f copy)
 
LVecBase4f operator= (float fill_value)
 
bool operator== (const LVecBase4f other)
 
 output (Ostream out)
 
LVecBase4f project (const LVecBase4f onto)
 Returns a new vector representing the projection of this vector onto another one. More...
 
 readDatagram (DatagramIterator source)
 Reads the vector from the Datagram using get_stdfloat(). More...
 
 readDatagramFixed (DatagramIterator source)
 Reads the vector from the Datagram using get_float32() or get_float64(). More...
 
 set (float x, float y, float z, float w)
 
 setCell (int i, float value)
 
 setW (float value)
 
 setX (float value)
 
 setY (float value)
 
 setZ (float value)
 
 writeDatagram (Datagram destination)
 Writes the vector to the Datagram using add_stdfloat(). More...
 
 writeDatagramFixed (Datagram destination)
 Writes the vector to the Datagram using add_float32() or add_float64(), depending on the type of floats in the vector, regardless of the setting of Datagram::set_stdfloat_double(). More...
 

Additional Inherited Members

- Public Types inherited from LVecBase4f
enum  { num_components = 4, is_int = 0 }
 
- Static Public Member Functions inherited from LVecBase4f
static TypeHandle getClassType ()
 
static int getNumComponents ()
 
static int size ()
 
static const LVecBase4f unitW ()
 Returns a unit W vector. More...
 
static const LVecBase4f unitX ()
 Returns a unit X vector. More...
 
static const LVecBase4f unitY ()
 Returns a unit Y vector. More...
 
static const LVecBase4f unitZ ()
 Returns a unit Z vector. More...
 
static const LVecBase4f zero ()
 Returns a zero-length vector. More...
 
- Public Attributes inherited from LVecBase4f
float x
 
LVecBase2f xy
 Returns the x and y component of this vector. More...
 
LVecBase3f xyz
 Returns the x, y and z component of this vector. More...
 
float y
 
float z
 

Detailed Description

An abstract mathematical description of a plane.

A plane is defined by the equation Ax + By + Cz + D = 0.

Member Function Documentation

◆ __init__() [1/6]

__init__ ( )

Creates a default plane.

This plane happens to intersect the origin, perpendicular to the Z axis. It's not clear how useful a default plane is.

◆ __init__() [2/6]

__init__ ( const  LPlanef)

◆ __init__() [3/6]

__init__ ( const LPoint3f  a,
const LPoint3f  b,
const LPoint3f  c 
)

Constructs a plane given three counter-clockwise points, as seen from the front of the plane (that is, viewed from the end of the normal vector, looking down).

◆ __init__() [4/6]

__init__ ( const LVecBase4f  copy)

◆ __init__() [5/6]

__init__ ( const LVector3f  normal,
const LPoint3f  point 
)

Constructs a plane given a surface normal vector and a point within the plane.

◆ __init__() [6/6]

__init__ ( float  a,
float  b,
float  c,
float  d 
)

Constructs a plane given the four terms of the plane equation.

◆ distToPlane()

float distToPlane ( const LPoint3f  point)

Returns the straight-line shortest distance from the point to the plane.

The returned value is positive if the point is in front of the plane (on the side with the normal), or negative in the point is behind the plane (on the opposite side from the normal). It's zero if the point is exactly in the plane.

◆ flip()

flip ( )

Convenience method that flips the plane in-place.

This is done by simply flipping the normal vector.

◆ getNormal()

LVector3f getNormal ( )

Returns the surface normal of the plane.

◆ getPoint()

LPoint3f getPoint ( )

Returns an arbitrary point in the plane.

This can be used along with the normal returned by get_normal() to reconstruct the plane.

◆ getReflectionMat()

LMatrix4f getReflectionMat ( )

This computes a transform matrix that reflects the universe to the other side of the plane, as in a mirror.

◆ intersectsLine()

bool intersectsLine ( LPoint3f  intersection_point,
const LPoint3f  p1,
const LPoint3f  p2 
)

Returns true if the plane intersects the infinite line passing through points p1 and p2, false if the line is parallel.

The points p1 and p2 are used only to define the Euclidean line; they have no other bearing on the intersection test. If true, sets intersection_point to the point of intersection.

◆ intersectsPlane()

bool intersectsPlane ( LPoint3f  from,
LVector3f  delta,
const LPlanef  other 
)

Returns true if the two planes intersect, false if they do not.

If they do intersect, then from and delta are filled in with the parametric representation of the line of intersection: that is, from is a point on that line, and delta is a vector showing the direction of the line.

◆ normalize()

bool normalize ( )

Normalizes the plane in place.

Returns true if the plane was normalized, false if the plane had a zero-length normal vector.

◆ normalized()

LPlanef normalized ( )

Normalizes the plane and returns the normalized plane as a copy.

If the plane's normal was a zero-length vector, the same plane is returned.

◆ operator *() [1/2]

LPlanef operator * ( const LMatrix3f  mat)

◆ operator *() [2/2]

LPlanef operator * ( const LMatrix4f  mat)

◆ operator *=()

LPlanef operator *= ( const LMatrix4f  mat)

◆ operator -()

LPlanef operator - ( )

◆ output()

output ( Ostream  out)

◆ project()

LPoint3f project ( const LPoint3f  point)

Returns the point within the plane nearest to the indicated point in space.

◆ write()

write ( Ostream  out,
int  indent_level 
)

◆ xform()

xform ( const LMatrix4f  mat)

Transforms the plane by the indicated matrix.