Specifies how atmospheric fog effects are applied to geometry. More...
Public Types  
enum  Mode { M_linear = 0, M_exponential = 1, M_exponential_squared = 2 } 
Public Types inherited from PandaNode  
enum  FancyBits { FB_transform = 1, FB_state = 2, FB_effects = 4, FB_tag = 16, FB_draw_mask = 32, FB_cull_callback = 64 } 
enum  UnexpectedChange { UC_parents = 1, UC_children = 2, UC_transform = 4, UC_state = 8, UC_draw_mask = 16 } 
Public Member Functions  
__init__ (str name)  
const LColor  getColor () 
Returns the color of the fog. More...  
float  getExpDensity () 
Returns the density of the fog for exponential calculations. More...  
const LPoint3  getLinearOnsetPoint () 
Returns the point in space at which the fog begins. More...  
const LPoint3  getLinearOpaquePoint () 
Returns the point in space at which the fog completely obscures geometry. More...  
Fog::Mode  getMode () 
setColor (const LColor color)  
Sets the color of the fog. More...  
setColor (float r, float g, float b)  
Sets the color of the fog. More...  
setExpDensity (float exp_density)  
Sets the density of the fog for exponential calculations. More...  
setLinearFallback (float angle, float onset, float opaque)  
Fog effects are traditionally defined in camerarelative space, but the Panda Fog node has a special mode in which it can define a linear fog effect in an arbitrary coordinate space. More...  
setLinearOnsetPoint (const LPoint3 linear_onset_point)  
Specifies the point in space at which the fog begins. More...  
setLinearOnsetPoint (float x, float y, float z)  
Specifies the point in space at which the fog begins. More...  
setLinearOpaquePoint (const LPoint3 linear_opaque_point)  
Specifies the point in space at which the fog completely obscures geometry. More...  
setLinearOpaquePoint (float x, float y, float z)  
Specifies the point in space at which the fog completely obscures geometry. More...  
setLinearRange (float onset, float opaque)  
Specifies the effects of the fog in linear distance units. More...  
setMode (Fog::Mode mode)  
Specifies the computation that is used to determine the fog effect. More...  
Public Member Functions inherited from PandaNode  
PandaNode  __copy__ () 
object  __deepcopy__ (object memo) 
__init__ (str name)  
int  __traverse__ (Visitproc visit, void arg) 
addChild (PandaNode child_node, int sort, Thread current_thread)  
Adds a new child to the node. More...  
addStashed (PandaNode child_node, int sort, Thread current_thread)  
Adds a new child to the node, directly as a stashed child. More...  
adjustDrawMask (DrawMask show_mask, DrawMask hide_mask, DrawMask clear_mask)  
Adjusts the hide/show bits of this particular node. More...  
Light  asLight () 
Crosscasts the node to a Light pointer, if it is one of the four kinds of Light nodes, or returns NULL if it is not. More...  
clearAttrib (TypeHandle type)  
Removes the render attribute of the given type from this node. More...  
clearAttrib (int slot)  
Removes the render attribute of the given type from this node. More...  
clearBounds ()  
Reverses the effect of a previous call to set_bounds(), and allows the node's bounding volume to be automatically computed once more based on the contents of the node. More...  
clearEffect (TypeHandle type)  
Removes the render effect of the given type from this node. More...  
clearEffects (Thread current_thread)  
Resets this node to have no render effects. More...  
clearPythonTag (object key)  
clearState (Thread current_thread)  
Resets this node to leave the render state alone. More...  
clearTag (str key, Thread current_thread)  
Removes the value defined for this key on this particular node. More...  
clearTransform (Thread current_thread)  
Resets the transform on this node to the identity transform. More...  
clearUnexpectedChange (unsigned int flags)  
Sets one or more of the PandaNode::UnexpectedChange bits off, indicating that the corresponding property may once again change on this node. More...  
PandaNode  combineWith (PandaNode other) 
Collapses this PandaNode with the other PandaNode, if possible, and returns a pointer to the combined PandaNode, or NULL if the two PandaNodes cannot safely be combined. More...  
int  compareTags (const PandaNode other) 
Returns a number less than 0, 0, or greater than 0, to indicate the similarity of tags between this node and the other one. More...  
copyAllProperties (PandaNode other)  
Copies the TransformState, RenderState, RenderEffects, tags, Python tags, and the show/hide state from the other node onto this one. More...  
copyChildren (PandaNode other, Thread current_thread)  
Makes another instance of all the children of the other node, copying them to this node. More...  
PandaNode  copySubgraph (Thread current_thread) 
Allocates and returns a complete copy of this PandaNode and the entire scene graph rooted at this PandaNode. More...  
copyTags (PandaNode other)  
Copies all of the tags stored on the other node onto this node. More...  
int  countNumDescendants () 
Returns the number of nodes at and below this level. More...  
int  findChild (PandaNode node, Thread current_thread) 
Returns the index of the indicated child node, if it is a child, or 1 if it is not. More...  
int  findParent (PandaNode node, Thread current_thread) 
Returns the index of the indicated parent node, if it is a parent, or 1 if it is not. More...  
int  findStashed (PandaNode node, Thread current_thread) 
Returns the index of the indicated stashed node, if it is a stashed child, or 1 if it is not. More...  
const RenderAttrib  getAttrib (TypeHandle type) 
Returns the render attribute of the indicated type, if it is defined on the node, or NULL if it is not. More...  
const RenderAttrib  getAttrib (int slot) 
Returns the render attribute of the indicated type, if it is defined on the node, or NULL if it is not. More...  
const BoundingVolume  getBounds (Thread current_thread) 
Returns the external bounding volume of this node: a bounding volume that contains the user bounding volume, the internal bounding volume, and all of the children's bounding volumes. More...  
const BoundingVolume  getBounds (UpdateSeq seq, Thread current_thread) 
This flavor of get_bounds() return the external bounding volume, and also fills in seq with the bounding volume's current sequence number. More...  
BoundingVolume::BoundsType  getBoundsType () 
Returns the bounding volume type set with set_bounds_type(). More...  
PandaNode  getChild (int n, Thread current_thread) 
Returns the nth child node of this node. More...  
list  getChildren () 
int  getChildSort (int n, Thread current_thread) 
Returns the sort index of the nth child node of this node (that is, the number that was passed to add_child()). More...  
DrawMask  getDrawControlMask () 
Returns the set of bits in draw_show_mask that are considered meaningful. More...  
DrawMask  getDrawShowMask () 
Returns the hide/show bits of this particular node. More...  
const RenderEffect  getEffect (TypeHandle type) 
Returns the render effect of the indicated type, if it is defined on the node, or NULL if it is not. More...  
const RenderEffects  getEffects (Thread current_thread) 
Returns the complete RenderEffects that will be applied to this node. More...  
int  getFancyBits (Thread current_thread) 
Returns the union of all of the enum FancyBits values corresponding to the various "fancy" attributes that are set on the node. More...  
const BoundingVolume  getInternalBounds (Thread current_thread) 
Returns the node's internal bounding volume. More...  
int  getInternalVertices (Thread current_thread) 
Returns the total number of vertices that will be rendered by this particular node alone, not accounting for its children. More...  
CollideMask  getIntoCollideMask () 
Returns the "into" collide mask for this node. More...  
CollideMask  getLegalCollideMask () 
Returns the subset of CollideMask bits that may be set for this particular type of PandaNode. More...  
int  getNestedVertices (Thread current_thread) 
Returns the total number of vertices that will be rendered by this node and all of its descendents. More...  
CollideMask  getNetCollideMask (Thread current_thread) 
Returns the union of all into_collide_mask() values set at CollisionNodes at this level and below. More...  
DrawMask  getNetDrawControlMask () 
Returns the set of bits in get_net_draw_show_mask() that have been explicitly set via adjust_draw_mask(), rather than implicitly inherited. More...  
DrawMask  getNetDrawShowMask () 
Returns the union of all draw_show_mask values–of renderable nodes only– at this level and below. More...  
int  getNumChildren (Thread current_thread) 
Returns the number of child nodes this node has. More...  
int  getNumParents (Thread current_thread) 
Returns the number of parent nodes this node has. More...  
int  getNumStashed (Thread current_thread) 
Returns the number of stashed nodes this node has. More...  
const RenderAttrib  getOffClipPlanes (Thread current_thread) 
Returns a ClipPlaneAttrib which represents the union of all of the clip planes that have been turned off at this level and below. More...  
PandaNode  getParent (int n, Thread current_thread) 
Returns the nth parent node of this node. More...  
list  getParents () 
const TransformState  getPrevTransform (Thread current_thread) 
Returns the transform that has been set as this node's "previous" position. More...  
object  getPythonTag (object key) 
object  getPythonTagKeys () 
object  getPythonTags () 
PandaNode::Stashed  getStashed (Thread current_thread) 
Returns an object that can be used to walk through the list of children of the node. More...  
PandaNode  getStashed (int n, Thread current_thread) 
Returns the nth stashed child of this node. More...  
list  getStashed () 
int  getStashedSort (int n, Thread current_thread) 
Returns the sort index of the nth stashed node of this node (that is, the number that was passed to add_child()). More...  
const RenderState  getState (Thread current_thread) 
Returns the complete RenderState that will be applied to all nodes at this level and below, as set on this node. More...  
str  getTag (str key, Thread current_thread) 
Retrieves the userdefined value that was previously set on this node for the particular key, if any. More...  
object  getTagKeys () 
const TransformState  getTransform (Thread current_thread) 
Returns the transform that has been set on this particular node. More...  
unsigned int  getUnexpectedChange (unsigned int flags) 
Returns nonzero if any of the bits in the input parameter are set on this node, or zero if none of them are set. More...  
bool  hasAttrib (TypeHandle type) 
Returns true if there is a render attribute of the indicated type defined on this node, or false if there is not. More...  
bool  hasAttrib (int slot) 
Returns true if there is a render attribute of the indicated type defined on this node, or false if there is not. More...  
bool  hasDirtyPrevTransform () 
Returns true if this node has the _dirty_prev_transform flag set, which indicates its _prev_transform is different from its _transform value (in pipeline stage 0). More...  
bool  hasEffect (TypeHandle type) 
Returns true if there is a render effect of the indicated type defined on this node, or false if there is not. More...  
bool  hasPythonTag (object key) 
bool  hasTag (str key, Thread current_thread) 
Returns true if a value has been defined on this node for the particular key (even if that value is the empty string), or false if no value has been set. More...  
bool  hasTags () 
Returns true if the node has any tags (or any Python tags) at all, false if it has none. More...  
bool  isAmbientLight () 
Returns true if this is an AmbientLight, false if it is not a light, or it is some other kind of light. More...  
bool  isBoundsStale () 
Returns true if the bounding volume of this node is stale and will be implicitly recomputed at the next call to get_bounds(), or false if it is fresh and need not be recomputed. More...  
bool  isCollisionNode () 
A simple downcast check. More...  
bool  isFinal (Thread current_thread) 
Returns the current state of the "final" flag. More...  
bool  isGeomNode () 
A simple downcast check. More...  
bool  isLodNode () 
A simple downcast check. More...  
bool  isOverallHidden () 
Returns true if the node has been hidden to all cameras by clearing its overall bit. More...  
bool  isSceneRoot () 
Returns true if this particular node is known to be the render root of some active DisplayRegion associated with the global GraphicsEngine, false otherwise. More...  
bool  isUnderSceneRoot () 
Returns true if this particular node is in a live scene graph: that is, it is a child or descendent of a node that is itself a scene root. More...  
listTags (Ostream out, str separator)  
Writes a list of all the tag keys assigned to the node to the indicated stream. More...  
ls (Ostream out, int indent_level)  
Lists all the nodes at and below the current path hierarchically. More...  
PandaNode  makeCopy () 
Returns a newlyallocated PandaNode that is a shallow copy of this one. More...  
markBoundsStale (Thread current_thread)  
Indicates that the bounding volume, or something that influences the bounding volume (or any of the other things stored in CData, like net_collide_mask), may have changed for this node, and that it must be recomputed. More...  
markInternalBoundsStale (Thread current_thread)  
Should be called by a derived class to mark the internal bounding volume stale, so that compute_internal_bounds() will be called when the bounding volume is next requested. More...  
output (Ostream out)  
prepareScene (GraphicsStateGuardianBase gsg, const RenderState node_state)  
Walks through the scene graph beginning at this node, and does whatever initialization is required to render the scene properly with the indicated GSG. More...  
removeAllChildren (Thread current_thread)  
Removes all the children from the node at once, including stashed children. More...  
bool  removeChild (PandaNode child_node, Thread current_thread) 
Removes the indicated child from the node. More...  
removeChild (int child_index, Thread current_thread)  
Removes the nth child from the node. More...  
removeStashed (int child_index, Thread current_thread)  
Removes the nth stashed child from the node. More...  
bool  replaceChild (PandaNode orig_child, PandaNode new_child, Thread current_thread) 
Searches for the orig_child node in the node's list of children, and replaces it with the new_child instead. More...  
replaceNode (PandaNode other)  
Inserts this node into the scene graph in place of the other one, and removes the other node. More...  
resetPrevTransform (Thread current_thread)  
Resets the transform that represents this node's "previous" position to the same as the current transform. More...  
setAttrib (const RenderAttrib attrib, int override)  
Adds the indicated render attribute to the scene graph on this node. More...  
setBound (const BoundingVolume volume)  
Deprecated. More...  
setBounds (const BoundingVolume volume)  
Resets the bounding volume so that it is the indicated volume. More...  
setBoundsType (BoundingVolume::BoundsType bounds_type)  
Specifies the desired type of bounding volume that will be created for this node. More...  
setEffect (const RenderEffect effect)  
Adds the indicated render effect to the scene graph on this node. More...  
setEffects (const RenderEffects effects, Thread current_thread)  
Sets the complete RenderEffects that will be applied this node. More...  
setFinal (bool flag)  
Sets the "final" flag on this PandaNode. More...  
setIntoCollideMask (CollideMask mask)  
Sets the "into" CollideMask. More...  
setOverallHidden (bool overall_hidden)  
Sets or clears the hidden flag. More...  
setPrevTransform (const TransformState transform, Thread current_thread)  
Sets the transform that represents this node's "previous" position, one frame ago, for the purposes of detecting motion for accurate collision calculations. More...  
setPythonTag (object key, object value)  
setState (const RenderState state, Thread current_thread)  
Sets the complete RenderState that will be applied to all nodes at this level and below. More...  
setTag (str key, str value, Thread current_thread)  
Associates a userdefined value with a userdefined key which is stored on the node. More...  
setTransform (const TransformState transform, Thread current_thread)  
Sets the transform that will be applied to this node and below. More...  
setUnexpectedChange (unsigned int flags)  
Sets one or more of the PandaNode::UnexpectedChange bits on, indicating that the corresponding property should not change again on this node. More...  
bool  stashChild (PandaNode child_node, Thread current_thread) 
Stashes the indicated child node. More...  
stashChild (int child_index, Thread current_thread)  
Stashes the indicated child node. More...  
stealChildren (PandaNode other, Thread current_thread)  
Moves all the children from the other node onto this node. More...  
bool  unstashChild (PandaNode child_node, Thread current_thread) 
Returns the indicated stashed node to normal child status. More...  
unstashChild (int stashed_index, Thread current_thread)  
Returns the indicated stashed node to normal child status. More...  
write (Ostream out, int indent_level)  
Public Member Functions inherited from TypedWritable  
object  __reduce__ () 
object  __reduce_persist__ (object pickler) 
VectorUchar  encodeToBamStream () 
Converts the TypedWritable object into a single stream of data using a BamWriter, and returns that data as a bytes object. More...  
bool  encodeToBamStream (VectorUchar data, BamWriter writer) 
Converts the TypedWritable object into a single stream of data using a BamWriter, and stores that data in the indicated string. More...  
fillin (DatagramIterator scan, BamReader manager)  
This internal function is intended to be called by each class's make_from_bam() method to read in all of the relevant data from the BamFile for the new object. More...  
UpdateSeq  getBamModified () 
Returns the current bam_modified counter. More...  
markBamModified ()  
Increments the bam_modified counter, so that this object will be invalidated and retransmitted on any open bam streams. More...  
Public Member Functions inherited from TypedObject  
TypeHandle  getType () 
int  getTypeIndex () 
Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More...  
bool  isExactType (TypeHandle handle) 
Returns true if the current object is the indicated type exactly. More...  
bool  isOfType (TypeHandle handle) 
Returns true if the current object is or derives from the indicated type. More...  
Public Member Functions inherited from ReferenceCount  
int  getRefCount () 
Returns the current reference count. More...  
ref ()  
Explicitly increments the reference count. More...  
bool  testRefCountIntegrity () 
Does some easy checks to make sure that the reference count isn't completely bogus. More...  
bool  testRefCountNonzero () 
Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More...  
bool  unref () 
Explicitly decrements the reference count. More...  
Public Member Functions inherited from Namable  
__init__ (const Namable)  
__init__ (str initial_name)  
clearName ()  
Resets the Namable's name to empty. More...  
str  getName () 
bool  hasName () 
Returns true if the Namable has a nonempty name set, false if the name is empty. More...  
output (Ostream out)  
Outputs the Namable. More...  
setName (str name)  
Static Public Member Functions  
static TypeHandle  getClassType () 
Static Public Member Functions inherited from PandaNode  
static PandaNode  decodeFromBamStream (VectorUchar data, BamReader reader) 
Reads the bytes created by a previous call to encode_to_bam_stream(), and extracts and returns the single object on those bytes. More...  
static DrawMask  getAllCameraMask () 
Returns a DrawMask that is appropriate for rendering to all cameras. More...  
static TypeHandle  getClassType () 
static DrawMask  getOverallBit () 
Returns the special bit that, when specifically cleared in the node's DrawMask, indicates that the node is hidden to all cameras, regardless of the remaining DrawMask bits. More...  
static  resetAllPrevTransform (Thread current_thread) 
Visits all nodes in the world with the _dirty_prev_transform flag–that is, all nodes whose _prev_transform is different from the _transform in pipeline stage 0–and resets the _prev_transform to be the same as _transform. More...  
Static Public Member Functions inherited from TypedWritableReferenceCount  
static TypedWritableReferenceCount  decodeFromBamStream (VectorUchar data, BamReader reader) 
Reads the bytes created by a previous call to encode_to_bam_stream(), and extracts and returns the single object on those bytes. More...  
static TypeHandle  getClassType () 
Static Public Member Functions inherited from TypedWritable  
static TypeHandle  getClassType () 
Static Public Member Functions inherited from TypedObject  
static TypeHandle  getClassType () 
Static Public Member Functions inherited from ReferenceCount  
static TypeHandle  getClassType () 
Static Public Member Functions inherited from Namable  
static TypeHandle  getClassType () 
Public Attributes  
const LColor  color 
Returns the color of the fog. More...  
float  exp_density 
Returns the density of the fog for exponential calculations. More...  
const LPoint3  linear_onset_point 
Returns the point in space at which the fog begins. More...  
const LPoint3  linear_opaque_point 
Returns the point in space at which the fog completely obscures geometry. More...  
Fog::Mode  mode 
Public Attributes inherited from PandaNode  
DrawMask  all_camera_mask 
Returns a DrawMask that is appropriate for rendering to all cameras. More...  
bool  bounds_stale 
Returns true if the bounding volume of this node is stale and will be implicitly recomputed at the next call to get_bounds(), or false if it is fresh and need not be recomputed. More...  
BoundingVolume::BoundsType  bounds_type 
Returns the bounding volume type set with set_bounds_type(). More...  
PandaNode::Children  children 
Returns an object that can be used to walk through the list of children of the node. More...  
DrawMask  draw_control_mask 
Returns the set of bits in draw_show_mask that are considered meaningful. More...  
DrawMask  draw_show_mask 
Returns the hide/show bits of this particular node. More...  
ConstPointerToRenderEffects  effects 
Returns the complete RenderEffects that will be applied to this node. More...  
bool  final 
Returns the current state of the "final" flag. More...  
ConstPointerToBoundingVolume  internal_bounds 
Returns the node's internal bounding volume. More...  
int  internal_vertices 
Returns the total number of vertices that will be rendered by this particular node alone, not accounting for its children. More...  
CollideMask  into_collide_mask 
Returns the "into" collide mask for this node. More...  
CollideMask  legal_collide_mask 
Returns the subset of CollideMask bits that may be set for this particular type of PandaNode. More...  
int  nested_vertices 
Returns the total number of vertices that will be rendered by this node and all of its descendents. More...  
DrawMask  overall_bit 
Returns the special bit that, when specifically cleared in the node's DrawMask, indicates that the node is hidden to all cameras, regardless of the remaining DrawMask bits. More...  
bool  overall_hidden 
Returns true if the node has been hidden to all cameras by clearing its overall bit. More...  
PandaNode::Parents  parents 
Returns an object that can be used to walk through the list of parents of the node, similar to get_children() and get_stashed(). More...  
ConstPointerToTransformState  prev_transform 
Returns the transform that has been set as this node's "previous" position. More...  
object  python_tags 
PandaNode::Stashed  stashed 
Returns the nth stashed child of this node. More...  
ConstPointerToRenderState  state 
Returns the complete RenderState that will be applied to all nodes at this level and below, as set on this node. More...  
String  tags [] 
ConstPointerToTransformState  transform 
Returns the transform that has been set on this particular node. More...  
Public Attributes inherited from TypedObject  
TypeHandle  type 
Returns the TypeHandle representing this object's type. More...  
Public Attributes inherited from ReferenceCount  
int  ref_count 
The current reference count. More...  
Public Attributes inherited from Namable  
const String  name 
Specifies how atmospheric fog effects are applied to geometry.
The Fog object is now a PandaNode, which means it can be used similarly to a Light to define effects relative to a particular coordinate system within the scene graph.
In exponential mode, the fog effects are always camerarelative, and it does not matter where the Fog node is parented. However, in linear mode, the onset and opaque distances are defined as offsets along the local forward axis (e.g. the Y axis). This allows the fog effect to be localized to a particular region in space, rather than always camera relative. If the fog object is not parented to any node, it is used to generate traditonal camerarelative fog, as if it were parented to the camera.
enum Mode 
__init__  (  str  name  ) 

static 
const LColor getColor  (  ) 
Returns the color of the fog.
float getExpDensity  (  ) 
Returns the density of the fog for exponential calculations.
This is only used if the mode is not M_linear.
const LPoint3 getLinearOnsetPoint  (  ) 
Returns the point in space at which the fog begins.
This is only used if the mode is M_linear.
const LPoint3 getLinearOpaquePoint  (  ) 
Returns the point in space at which the fog completely obscures geometry.
This is only used if the mode is M_linear.
Fog::Mode getMode  (  ) 
setColor  (  const LColor  color  ) 
Sets the color of the fog.
The alpha component is not used.
setColor  (  float  r, 
float  g,  
float  b  
) 
Sets the color of the fog.
setExpDensity  (  float  exp_density  ) 
Sets the density of the fog for exponential calculations.
This is only used if the mode is not M_linear.
If the mode is currently set to M_linear, this function implicitly sets it to M_exponential.
setLinearFallback  (  float  angle, 
float  onset,  
float  opaque  
) 
Fog effects are traditionally defined in camerarelative space, but the Panda Fog node has a special mode in which it can define a linear fog effect in an arbitrary coordinate space.
This is done by specifying 3d onset and opaque points, and parenting the Fog object somewhere within the scene graph. In this mode, the fog will be rendered as if it extended along the vector from the onset point to the opaque point, in 3d space.
However, the underlying fog effect supported by hardware is generally only onedimensional, and must be rendered based on linear distance from the camera plane. Thus, this intheworld effect is most effective when the fog vector from onset point to opaque point is most nearly parallel to the camera's eye vector.
As the angle between the fog vector and the eye vector increases, the accuracy of the effect diminishes, up to a complete breakdown of the effect at a 90 degree angle.
This function exists to define the workaround to this problem. The linear fallback parameters given here specify how the fog should be rendered when the parameters are exceeded in this way.
The angle parameter is the minimum angle, in degrees, of the fog vector to the eye vector, at which the fallback effect should be employed. The onset and opaque parameters specify the camerarelative onset and opaque distances to pass to the rendering hardware when employing the fallback effect. This supercedes the 3d onset point and opaque points.
setLinearOnsetPoint  (  const LPoint3  linear_onset_point  ) 
Specifies the point in space at which the fog begins.
This is only used if the mode is M_linear.
setLinearOnsetPoint  (  float  x, 
float  y,  
float  z  
) 
Specifies the point in space at which the fog begins.
This is only used if the mode is M_linear.
setLinearOpaquePoint  (  const LPoint3  linear_opaque_point  ) 
Specifies the point in space at which the fog completely obscures geometry.
This is only used if the mode is M_linear.
setLinearOpaquePoint  (  float  x, 
float  y,  
float  z  
) 
Specifies the point in space at which the fog completely obscures geometry.
This is only used if the mode is M_linear.
setLinearRange  (  float  onset, 
float  opaque  
) 
Specifies the effects of the fog in linear distance units.
This is only used if the mode is M_linear.
This specifies a fog that begins at distance onset units from the origin, and becomes totally opaque at distance opaque units from the origin, along the forward axis (usually Y).
This function also implicitly sets the mode the M_linear, if it is not already set.
setMode  (  Fog::Mode  mode  ) 
Specifies the computation that is used to determine the fog effect.
If this is M_linear, then the fog will range from linearly from the onset point to the opaque point (or for the distances specified in set_linear_range), and the fog object should be parented into the scene graph, or to the camera.
If this is anything else, the onset point and opaque point are not used, and the fog effect is based on the value specified to set_exp_density(), and it doesn't matter to which node the fog object is parented, or if it is parented anywhere at all.
const LColor color 
Returns the color of the fog.
float exp_density 
Returns the density of the fog for exponential calculations.
This is only used if the mode is not M_linear.
const LPoint3 linear_onset_point 
Returns the point in space at which the fog begins.
This is only used if the mode is M_linear.
const LPoint3 linear_opaque_point 
Returns the point in space at which the fog completely obscures geometry.
This is only used if the mode is M_linear.
Fog::Mode mode 