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# MFnLight Class Reference
OpenMaya - API module for common classes | FunctionSet classes

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## Detailed Description

Manage dependency graph nodes representing lights.

MFnLight allows the creation and manipulation of dependency graph nodes representing lights. This is the top level of a hierarchy of light node function sets. It permits manipulation of the attributes common to all types of lights.

Examples:

  D3DResourceManager.cpp, D3DViewportRenderer.cpp, hwAnisotropicShader_NV20.cpp, hwToonShader_NV20.cpp, scanDagCmd.cpp, and scanDagSyntax.cpp.

`#include <MFnLight.h>`

Inheritance diagram for MFnLight:
[legend]

List of all members.

## Public Member Functions
virtual MFn::Type | type () const
| Function set type.
virtual | ~MFnLight ()
| Destructor.
| MFnLight ()
| Default constructor.
| MFnLight (MObject &object, MStatus *ReturnStatus=NULL)
| Constructor.
| MFnLight (const MDagPath &object, MStatus *ret=NULL)
| Constructor.
MColor | color (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "color" attribute of a light node.
MStatus | setColor (const MColor &col)
| Sets the value of the "color" attribute of a light node.
float | intensity (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "intensity" attribute of a light node.
MStatus | setIntensity (const float &intens)
| Sets the value of the "intensity" attribute of a light node.
bool | useRayTraceShadows (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "useRayTraceShadows" attribute of a light node.
MStatus | setUseRayTraceShadows (const bool &useRayTraceShadows)
| Sets the value of the "useRayTraceShadows" attribute of a light node.
MColor | shadowColor (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "shadowColor" attribute of a light node.
MStatus | setShadowColor (const MColor &shadow_color)
| Sets the value of the "shadowColor" attribute of a light node.
double | centerOfIllumination (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "centerOfIllumination" attribute of a light node.
MStatus | setCenterOfIllumination (const double &dist)
| Sets the value of the "centerOfIllumination" attribute of a light node.
short | numShadowSamples (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "numShadowSamples" attribute of a light node.
MStatus | setNumShadowSamples (const short &num_shadow_samples)
| Sets the value of the "numShadowSamples" attribute of a light node.
short | rayDepthLimit (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "rayDepthLimit" attribute of a light node.
MStatus | setRayDepthLimit (const short &rayDepthLimit)
| Sets the value of the "rayDepthLimit" attribute of a light node.
MColor | opticalFXvisibility (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "opticalFXvisibility" attribute of a light node.
MStatus | setOpticalFXvisibility (const MColor &visibility)
| Sets the value of the "opticalFXvisibility" attribute of a light node.
MColor | lightIntensity (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "lightIntensity" attribute of a light node.
MFloatVector | lightDirection (int instance, MSpace::Space space=MSpace::kWorld, MStatus *ReturnStatus=NULL) const
| Returns the direction in which the light is pointing.
MFloatVector | lightDirection (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "lightDirection" attribute of a light node.
bool | lightAmbient (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "lightAmbient" attribute of a light node.
bool | lightDiffuse (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "lightDiffuse" attribute of a light node.
bool | lightSpecular (MStatus *ReturnStatus=NULL) const
| Retrieves the value of the "lightSpecular" attribute of a light node.
| MFnLight (const MObject &object, MStatus *ret=NULL)
| Constructor.
## Protected Member Functions
virtual const char * | className () const
| Class name.

## Constructor & Destructor Documentation

~MFnLight | ( |  | ) | `[virtual]`

Destructor.

The class destructor.

MFnLight | ( | MObject & | object,
|  | MStatus * | ReturnStatus = `NULL`
| ) |  |

Constructor.

Class constructor that initializes the function set to the given MObject.

Parameters:

  [in] | object | The MObject to attach the function set to
  [out] | ReturnStatus | the return status

Status Codes:
  - MS::kSuccess if the function set is successfully attached
  - MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

MFnLight | ( | const MDagPath & | object,
|  | MStatus * | ReturnStatus = `NULL`
| ) |  |

Constructor.

Class constructor that initializes the function set to the given constant MDagPath object.

Parameters:

  [in] | object | The const MDagPath to attach the function set to
  [out] | ReturnStatus | The return status

Status Codes:
  - MS::kSuccess if the function set is successfully attached
  - MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

MFnLight | ( | const MObject & | object,
|  | MStatus * | ReturnStatus = `NULL`
| ) |  |

Constructor.

Class constructor that initializes the function set to the given MObject.

Parameters:

  [in] | object | The MObject to attach the function set to
  [out] | ReturnStatus | the return status

Status Codes:
  - MS::kSuccess if the function set is successfully attached
  - MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

## Member Function Documentation

MFn::Type type | ( |  | ) | const`[virtual]`

Search for all occurrences

Function set type.

Return the class type : MFn::kLight.

Reimplemented from MFnDagNode.

Reimplemented in MFnAmbientLight, MFnAreaLight, MFnDirectionalLight, MFnNonAmbientLight, MFnNonExtendedLight, MFnPointLight, MFnSpotLight, and MFnVolumeLight.

const char * className | ( |  | ) | const`[protected, virtual]`

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Class name.

Return the class name : "MFnLight".

Reimplemented from MFnDagNode.

Reimplemented in MFnAmbientLight, MFnAreaLight, MFnDirectionalLight, MFnNonAmbientLight, MFnNonExtendedLight, MFnPointLight, MFnSpotLight, and MFnVolumeLight.

MColor color | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "color" attribute of a light node.

This attribute represents the color of the light emitted by the light node.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "color" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

MStatus setColor | ( | const MColor & | col | ) |

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Sets the value of the "color" attribute of a light node.

Parameters:

  [in] | col | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object,

float intensity | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "intensity" attribute of a light node.

This attribute represents a uniform scaling factor applied to the light color.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "intensity" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

MStatus setIntensity | ( | const float & | intens | ) |

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Sets the value of the "intensity" attribute of a light node.

Parameters:

  [in] | intens | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object,

bool useRayTraceShadows | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "useRayTraceShadows" attribute of a light node.

This attribute determines whether or not the light should raytrace it's shadows.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "useRayTraceShadows" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

MStatus setUseRayTraceShadows | ( | const bool & | useRayTraceShadows | ) |

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Sets the value of the "useRayTraceShadows" attribute of a light node.

Parameters:

  [in] | useRayTraceShadows | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object,

MColor shadowColor | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "shadowColor" attribute of a light node.

This attribute represents the color of the shadows cast by the light.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "shadowColor" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object.

MStatus setShadowColor | ( | const MColor & | shadow_color | ) |

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Sets the value of the "shadowColor" attribute of a light node.

Parameters:

  [in] | shadow_color | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object,

double centerOfIllumination | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "centerOfIllumination" attribute of a light node.

This attribute represents the distance to the center of illumination of the light.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "centerOfIllumination" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object.

MStatus setCenterOfIllumination | ( | const double & | dist | ) |

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Sets the value of the "centerOfIllumination" attribute of a light node.

Parameters:

  [in] | dist | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object,

short numShadowSamples | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "numShadowSamples" attribute of a light node.

This attribute represents the number of shadow samples per point used in occulusion testing.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "numShadowSamples" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object.

MStatus setNumShadowSamples | ( | const short & | num_shadow_samples | ) |

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Sets the value of the "numShadowSamples" attribute of a light node.

Parameters:

  [in] | num_shadow_samples | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object,

short rayDepthLimit | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "rayDepthLimit" attribute of a light node.

This attribute determines a cutoff point for shadow calculations related to the light. Rays whose depth is higher than the value of this attribute will not trigger a shadow calculation for the light.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "rayDepthLimit" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object.

MStatus setRayDepthLimit | ( | const short & | ray_depth_limit | ) |

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Sets the value of the "rayDepthLimit" attribute of a light node.

Parameters:

  [in] | ray_depth_limit | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object,

MColor opticalFXvisibility | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "opticalFXvisibility" attribute of a light node.

This attribute represents an occlusion scaling factor for light glow effects on this light.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "opticalFXvisibility" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object.

MStatus setOpticalFXvisibility | ( | const MColor & | visibility | ) |

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Sets the value of the "opticalFXvisibility" attribute of a light node.

Parameters:

  [in] | visibility | value to which the attribute will be set.

Returns:
  Return status

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set doesn not have a valid object,

MColor lightIntensity | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "lightIntensity" attribute of a light node.

This attribute represents the intensity of the light specified as a color.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "lightIntensity" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

MFloatVector lightDirection | ( | int | instance,
|  | MSpace::Space | space = `MSpace::kWorld`,
|  | MStatus * | ReturnStatus = `NULL`
| ) |  | const

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Returns the direction in which the light is pointing.

This is only valid for lights which are associated with a direction, such as area, directional or spot lights. The vector returned is not normalized.

Parameters:

  [in] | instance | The instance of the light for which to return the direction.
  [in] | space | The coordinate space for which the direction vector is returned. If MSpace::kWorld is passed in the vector will be in the lights world space. If any other MSpace::Space value in pass in the vector will be returned in object (or local) space.
  [out] | ReturnStatus | return status

Returns:
  A vector containing the direction of the light is the specified coordinate system.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

Examples:
  intersectCmd.cpp.

MFloatVector lightDirection | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "lightDirection" attribute of a light node.

This attribute represents the direction from the light to the point being shading.

NOTE: This value is only valid during the rendering phase. See lightDirection method above for actual light direction.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "lightDirection" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

bool lightAmbient | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "lightAmbient" attribute of a light node.

This attribute indicates if the light has an ambient component.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "lightAmbient" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

bool lightDiffuse | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "lightDiffuse" attribute of a light node.

This attribute indicates if the light has a diffuse component.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "lightDiffuse" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

bool lightSpecular | ( | MStatus * | ReturnStatus = `NULL` | ) | const

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Retrieves the value of the "lightSpecular" attribute of a light node.

This attribute indicates if the light has a specular component.

Parameters:

  [out] | ReturnStatus | return status

Returns:
  The value of the "lightSpecular" attribute of the light node.

Status Codes:
  - MS::kSuccess operation successful
  - MS::kFailure function set does not have a valid object.

MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight
MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight MFnLight