#include
<MFnFluid.h>
This is the function set for fluid objects.
A fluid object is a node in the dependency graph that contains a grid which is made up of cells. Each cell has a variety of values assigned to it such as density, velocity, temperature, and color. The grid may be 2D or 3D. See the methods below for full details.
Fluid objects may be used for simulation purposes. This function set allows read and write access to the values in the cells of the fluid object.
Public Types 

enum  FluidMethod { kZero, kStaticGrid, kDynamicGrid, kGradient } 
Defines how voxel values are computed for
most types of fluid data. More... 

enum  FluidGradient
{ kConstant, kXGradient, kYGradient, kZGradient, kNegXGradient, kNegYGradient, kNegZGradient, kCenterGradient } 
Defines the orientation of the gradient.
More... 

enum  FalloffMethod { kNoFalloffGrid, kStaticFalloffGrid } 
Falloff data only supports a subset of the
available fluid methods. More... 

enum  ColorMethod { kUseShadingColor, kStaticColorGrid, kDynamicColorGrid } 
Color data has its own set of methods for
computing voxel data. More... 

enum  CoordinateMethod { kFixed, kGrid } 
Coordinate data has its own set of methods
for computing voxel data. More... 

Public Member Functions 

virtual MFn::Type  type () const 
Function set type. 

virtual  ~MFnFluid () 
Destructor. 

MFnFluid ()  
Default constructor. 

MFnFluid (MObject &object, MStatus *ReturnStatus=NULL)  
Constructor. 

MFnFluid (const MDagPath &object, MStatus *ret=NULL)  
Constructor. 

MObject  create3D (unsigned int Xres, unsigned int Yres, unsigned int Zres, double Xdim, double Ydim, double Zdim, MObject parentOrOwner=MObject::kNullObj, MStatus *ReturnStatus=NULL) 
MObject  create2D (unsigned int Xres, unsigned int Yres, double Xdim, double Ydim, MObject parentOrOwner=MObject::kNullObj, MStatus *ReturnStatus=NULL) 
MStatus  getResolution (unsigned int &Xres, unsigned int &Yres, unsigned int &Zres) const 
MStatus  getResolution (unsigned int &Xres, unsigned int &Yres) const 
MStatus  getDimensions (double &Xdim, double &Ydim, double &Zdim) const 
MStatus  setSize (unsigned int Xres, unsigned int Yres, unsigned int Zres, double Xdim, double Ydim, double Zdim, bool resample) 
MStatus  setSize (unsigned int Xres, unsigned int Yres, double Xdim, double Ydim, bool resample) 
unsigned int  gridSize (MStatus *ReturnStatus=NULL) 
MStatus  velocityGridSizes (int &xsize, int &ysize, int &zsize) 
float *  falloff (MStatus *ReturnStatus=NULL) 
float *  density (MStatus *ReturnStatus=NULL) 
MStatus  getVelocity (float *&Xvel, float *&Yvel, float *&Zvel) 
float *  pressure (MStatus *ReturnStatus=NULL) 
float *  temperature (MStatus *ReturnStatus=NULL) 
float *  fuel (MStatus *ReturnStatus=NULL) 
MStatus  getCoordinates (float *&u, float *&v, float *&w) 
MStatus  getColors (float *&r, float *&g, float *&b) 
MStatus  setFalloffMode (FalloffMethod mode) 
MStatus  getFalloffMode (FalloffMethod &mode) 
MStatus  setDensityMode (FluidMethod mode, FluidGradient gradient) 
MStatus  getDensityMode (FluidMethod &mode, FluidGradient &gradient) 
MStatus  setVelocityMode (FluidMethod mode, FluidGradient gradient) 
MStatus  getVelocityMode (FluidMethod &mode, FluidGradient &gradient) 
MStatus  setTemperatureMode (FluidMethod mode, FluidGradient gradient) 
MStatus  getTemperatureMode (FluidMethod &mode, FluidGradient &gradient) 
MStatus  setFuelMode (FluidMethod mode, FluidGradient gradient) 
MStatus  getFuelMode (FluidMethod &mode, FluidGradient &gradient) 
MStatus  setCoordinateMode (CoordinateMethod mode) 
MStatus  getCoordinateMode (CoordinateMethod &mode) 
MStatus  setColorMode (ColorMethod mode) 
MStatus  getColorMode (ColorMethod &mode) 
MStatus  getForceAtPoint (const MPointArray &point, const MVectorArray &velocity, const MDoubleArray &mass, MVectorArray &force, double deltaTime=1.0/24.0) 
MStatus  getForceAtPoint (const MVectorArray &point, const MVectorArray &velocity, const MDoubleArray &mass, MVectorArray &force, double deltaTime=1.0/24.0) 
bool  toGridIndex (const MPoint &objectSpacePoint, int3 &gridCoords, MStatus *status=NULL) 
MStatus  voxelCenterPosition (int xi, int yi, int zi, MPoint &objectSpacePoint) 
MStatus  updateGrid () 
void  emitIntoArrays (float val, int x, int y, int z, float density, float heat, float fuel, bool doColor, const MColor &emitColor) 
int  index (int xi, int yi) 
int  index (int xi, int yi, int zi) 
void  index (int ai, int &xi, int &yi, int &zi) 
int  index (int xi, int yi, int zi, int xres, int yres, int zres) 
void  index (int ai, int xres, int yres, int zres, int &xi, int &yi, int &zi) 
MFnFluid (const MObject &object, MStatus *ret=NULL)  
Constructor. 

Protected Member Functions 

virtual const char *  className () const 
Class name. 
Defines the orientation of the gradient.
MFnFluid::~MFnFluid  (  )  [virtual] 
Destructor.
Destructor.
Constructor.
Class constructor that initializes the function set to the given MObject.
[in]  object  The MObject to attach the function set to 
[out]  ReturnStatus  the return status 
Constructor.
Class constructor that initializes the function set to the given constant MDagPath object.
[in]  object  The const MDagPath to attach the function set to 
[out]  ReturnStatus  The return status 
Constructor.
Class constructor that initializes the function set to the given MObject.
[in]  object  The MObject to attach the function set to 
[out]  ReturnStatus  the return status 
MFn::Type MFnFluid::type  (  )  const [virtual] 
const char * MFnFluid::className  (  )  const [protected, virtual] 
MObject MFnFluid::create3D  (  unsigned int  Xres,  
unsigned int  Yres,  
unsigned int  Zres,  
double  Xdim,  
double  Ydim,  
double  Zdim,  
MObject  parent = MObject::kNullObj , 

MStatus *  ReturnStatus =
NULL 

) 
Creates a fluid object from the specified data and sets this function set to operate on the new fluid object.
The parent argument is used to specify the DAG parent of the new fluid. If parent is NULL then a new transform will be created and returned which will be the parent for the new fluid shape. The new transform will be added to the DAG.
If parent is a DAG node then the new fluid will be returned and the parent passed in will become the new node's parent.
[in]  Xres  number of fluid grid cells in the x dimension 
[in]  Yres  number of fluid grid cells in the y dimension 
[in]  Zres  number of fluid grid cells in the z dimension 
[in]  Xdim  object space size in the x dimension 
[in]  Ydim  object space size in the y dimension 
[in]  Zdim  object space size in the z dimension 
[in]  parent  specifies what to do with the new fluid object. If a DAG object or NULL is given then a transform will be created for the new fluid shape and placed under the specified (optional)parent. 
[out]  ReturnStatus  Status code 
MObject MFnFluid::create2D  (  unsigned int  Xres,  
unsigned int  Yres,  
double  Xdim,  
double  Ydim,  
MObject  parent = MObject::kNullObj , 

MStatus *  ReturnStatus =
NULL 

) 
Creates a fluid object from the specified data and sets this function set to operate on the new fluid object.
The parent argument is used to specify the DAG parent of the new fluid. If parent is NULL then a new transform will be created and returned which will be the parent for the new fluid shape. The new transform will be added to the DAG.
If parent is a DAG node then the new fluid will be returned and the parent passed in will become the new node's parent.
[in]  Xres  number of fluid grid cells in the x dimension 
[in]  Yres  number of fluid grid cells in the y dimension 
[in]  Xdim  object space size in the x dimension 
[in]  Ydim  object space size in the y dimension 
[in]  parent  specifies what to do with the new fluid object. If a DAG object or NULL is given then a transform will be created for the new fluid shape and placed under the specified (optional)parent. 
[out]  ReturnStatus  Status code 
MStatus MFnFluid::getResolution  (  unsigned int &  Xres,  
unsigned int &  Yres,  
unsigned int &  Zres  
)  const 
Gets the resolution of the fluid. The resolution gives the number of cells in the fluid grid in each direction.
[out]  Xres  storage for returning the number of fluid grid cells in the x dimension 
[out]  Yres  storage for returning the number of fluid grid cells in the y dimension 
[out]  Zres  storage for returning the number of fluid grid cells in the z dimension 
MStatus MFnFluid::getResolution  (  unsigned int &  Xres,  
unsigned int &  Yres  
)  const 
Gets the resolution of the fluid. The resolution gives the number of cells in the fluid grid in each direction.
[out]  Xres  storage for returning the number of fluid grid cells in the x dimension 
[out]  Yres  storage for returning the number of fluid grid cells in the y dimension 
MStatus MFnFluid::getDimensions  (  double &  Xdim,  
double &  Ydim,  
double &  Zdim  
)  const 
Gets the dimensions of the fluid. The dimensions give the object space size of the fluid object in each direction.
[out]  Xdim  storage for returning the dimension of the fluid in x 
[out]  Ydim  storage for returning the dimension of the fluid in y 
[out]  Zdim  storage for returning the dimension of the fluid in z 
MStatus MFnFluid::setSize  (  unsigned int  Xres,  
unsigned int  Yres,  
unsigned int  Zres,  
double  Xdim,  
double  Ydim,  
double  Zdim,  
bool  resample  
) 
Sets the size and resolution of the grid. The resolution parameters control the number of cells in the fluid grid and the dimension parameters set the size of the fluid shape in object space.
[in]  Xres  number of fluid grid cells in the x dimension 
[in]  Yres  number of fluid grid cells in the y dimension 
[in]  Zres  number of fluid grid cells in the z dimension 
[in]  Xdim  object space size in the x dimension 
[in]  Ydim  object space size in the y dimension 
[in]  Zdim  object space size in the z dimension 
[in]  resample  true if the previous contents of the grid should be scaled to fit the new size by resampling the previous data at the new resolution 
MStatus MFnFluid::setSize  (  unsigned int  Xres,  
unsigned int  Yres,  
double  Xdim,  
double  Ydim,  
bool  resample  
) 
Sets the size and resolution of the grid. The resolution parameters control the number of cells in the fluid grid and the dimension parameters set the size of the fluid shape in object space.
[in]  Xres  number of fluid grid cells in the x dimension 
[in]  Yres  number of fluid grid cells in the y dimension 
[in]  Xdim  object space size in the x dimension 
[in]  Ydim  object space size in the y dimension 
[in]  resample  true if the previous contents of the grid should be scaled to fit the new size by resampling the previous data at the new resolution 
unsigned int MFnFluid::gridSize  (  MStatus *  ReturnStatus =
NULL 
) 
Returns the number of elements in the grid. This is equal to (x resolution * y resolution * z resolution). This routine is provided as a convenience to be used with the methods that give direct access to the fluid data. This gives the upper bound on the arrays. This size applies to all grids except for the 3 velocity grids.
[out]  ReturnStatus  Status code. 
MStatus MFnFluid::velocityGridSizes  (  int &  xsize,  
int &  ysize,  
int &  zsize  
) 
Returns the number of elements in the velocity grids. X velocity size = (x resolution+1 * y resolution * z resolution). Y velocity size = (x resolution * y resolution+1 * z resolution). Z velocity size = (x resolution * y resolution * z resolution+1).
This routine is provided as a convenience to be used with the methods that give direct access to the velocity grids.
[out]  xsize  storage for the x velocity grid size 
[out]  ysize  storage for the y velocity grid size 
[out]  zsize  storage for the z velocity grid size 
float * MFnFluid::falloff  (  MStatus *  ReturnStatus =
NULL 
) 
This method returns a pointer to the storage for the falloff data in the fluid. The size of this array can be obtained using the "gridSize" call.
The returned pointer points to an array of float values, each one representing the falloff value in a cell of the fluid grid. To get the array index corresponding to a cell index (x,y,z), use the "index" helper method.
If you modify the data via the pointer returned, you must call the "updateGrid" call or you will not see your changes.
Values from the falloff grid are used when the fluid's Falloff Shape attribute is set to "Grid". This mode allows users to specify arbitrary falloff values between 0 and 1 at each grid cell. At render time, the shaded opacity values of the fluid will be multiplied by the interpolated falloff grid value raised to the power of 1/(1ed), where "ed" is the value of the fluid's "edgeDropoff" attribute. When edgeDropoff=0, the opacity multiplier is 1, and when edgeDropoff is 1, the opacity multiplier is 0. Assuming that falloff grid values are in the range [0,1], raising the edge dropoff value from 0 to 1 will cause the fluid opacity to smoothly fall off towards complete transparency.
[out]  ReturnStatus  Status code 
float * MFnFluid::density  (  MStatus *  ReturnStatus =
NULL 
) 
This method returns a pointer to the storage for the density data in the fluid. The size of this array can be obtained using the "gridSize" call.
The pointer returned points to an array of float values, each one representing the density value in a cell of the fluid grid. To get the index of in the array for a cell at a given (x, y, z) use the "index" helper method.
If you modify the data via the pointer returned, you must call the "updateGrid" call or you will not see your changes.
[out]  ReturnStatus  Status code 
MStatus MFnFluid::getVelocity  (  float *&  Xvel,  
float *&  Yvel,  
float *&  Zvel  
) 
This method returns pointers to the storage for the velocity data in the fluid. The size of these arrays can be obtained using the "gridSize" call.
Each of the pointers returned points to an array of float values, each value representing the velocity in a cell of the fluid grid . The three arrays contain the x components, y components, and z components of the velocity respectively.
The grid sizes are different for each of the velocity grids. The Xvel grid is one larger in X, the Yvel in Y, the Zvel in Z. This is because the velocity components are stored at the voxel face centers, not at the voxel centers. The index methods that specify the resolutions explicitly should be used for the velocity grids.
If you modify the data via the pointers returned, you must call the "updateGrid" call or you will not see your changes.
[out]  Xvel  storage for returning a pointer to the x components of the velocity values in the grid 
[out]  Yvel  storage for returning a pointer to the y components of the velocity values in the grid 
[out]  Zvel  storage for returning a pointer to the z components of the velocity values in the grid 
float * MFnFluid::pressure  (  MStatus *  ReturnStatus =
NULL 
) 
This method returns a pointer to the storage for the pressure data in the fluid. The size of this array can be obtained using the "gridSize" call. Note that the pressure data only exists if the velocity method is kStaticGrid or kDynamicGrid
The pointer returned points to an array of float values, each one representing the pressure value in a cell of the fluid grid. To get the index of in the array for a cell at a given (x, y, z) use the "index" helper method.
If you modify the data via the pointer returned, you must call the "updateGrid" call or you will not see your changes. Note that the pressure data is an output of the velocity calculation. if you modify the pressure grid and the velocity grid is dynamic, your changes will be replaced after the next fluid evaluation.
[out]  ReturnStatus  Status code 
float * MFnFluid::temperature  (  MStatus *  ReturnStatus =
NULL 
) 
This method returns a pointer to the storage for the temperature data in the fluid. The size of this array can be obtained using the "gridSize" call.
The pointer returned points to an array of float values, each one representing the temperature value in a cell of the fluid grid. To get the index of in the array for a cell at a given (x, y, z) use the "index" helper method.
If you modify the data via the pointer returned, you must call the "updateGrid" call or you will not see your changes.
[out]  ReturnStatus  Status code 
float * MFnFluid::fuel  (  MStatus *  ReturnStatus =
NULL 
) 
This method returns a pointer to the storage for the fuel data in the fluid. The size of this array can be obtained using the "gridSize" call.
The pointer returned points to an array of float values, each one representing the fuel value in a cell of the fluid grid. To get the index of in the array for a cell at a given (x, y, z) use the "index" helper method.
If you modify the data via the pointer returned, you must call the "updateGrid" call or you will not see your changes.
[out]  ReturnStatus  Status code 
MStatus MFnFluid::getCoordinates  (  float *&  u,  
float *&  v,  
float *&  w  
) 
This method returns pointers to the storage for the uvw coordinate data in the fluid. The size of these arrays can be obtained using the "gridSize" call. The uvw values supply the 3D texture mapping coordinates for each cell.
Each of the pointers returned points to an array of float values, each value representing the u, v, or w value in a cell of the fluid grid. To get the index of in the array for a cell at a given (x, y, z) use the "index" helper method. The three arrays contain the u values, v values, and w values of the texture coordinates respectively.
For a 2D fluid, a NULL pointer will be returned for the w array.
If you modify the data via the pointers returned, you must call the "updateGrid" call or you will not see your changes.
[out]  u  storage for returning a pointer to the u values in the grid 
[out]  v  storage for returning a pointer to the v values in the grid 
[out]  w  storage for returning a pointer to the w values in the grid 
MStatus MFnFluid::getColors  (  float *&  r,  
float *&  g,  
float *&  b  
) 
This method returns pointers to the storage for the color data in the fluid. The size of these arrays can be obtained using the "gridSize" call.
Each of the pointers returned points to an array of float values, each value representing the color in a cell of the fluid grid. To get the index of in the array for a cell at a given (x, y, z) use the "index" helper method. The three arrays contain the r components, g components, and b components of the color respectively.
If you modify the data via the pointers returned, you must call the "updateGrid" call or you will not see your changes.
[out]  r  storage for returning a pointer to the red components of the color values in the grid 
[out]  g  storage for returning a pointer to the green components of the color values in the grid 
[out]  b  storage for returning a pointer to the blue components of the color values in the grid 
MStatus MFnFluid::setFalloffMode  (  MFnFluid::FalloffMethod  method  ) 
Set the modes by which the shader falloff values in the grid are determined. If the falloff grid is enabled, its values must be set by the user.
The method parameter may have the following values:
[in]  method  method for determining the falloff value in the grid 
MStatus MFnFluid::getFalloffMode  (  MFnFluid::FalloffMethod &  method  ) 
Get the modes by which the falloff values in the grid are determined. If the falloff grid is enabled, its values must be set by the user.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the falloff value in the grid is determined 
MStatus MFnFluid::setDensityMode  (  MFnFluid::FluidMethod  method,  
MFnFluid::FluidGradient  gradient  
) 
Set the modes by which the density values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may have the following values:
[in]  method  method for determining the fluid density in the grid 
[in]  gradient  gradient type, only used if the method is kGradient 
MStatus MFnFluid::getDensityMode  (  MFnFluid::FluidMethod &  method,  
MFnFluid::FluidGradient &  gradient  
) 
Get the modes by which the density values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the fluid density in the grid is determined 
[out]  gradient  storage for returning the gradient type, which is only relevant if the method is kGradient 
MStatus MFnFluid::setVelocityMode  (  MFnFluid::FluidMethod  method,  
MFnFluid::FluidGradient  gradient  
) 
Set the modes by which the velocity values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may have the following values:
[in]  method  method for determining the fluid velocity in the grid 
[in]  gradient  gradient type, only used if the method is kGradient 
MStatus MFnFluid::getVelocityMode  (  MFnFluid::FluidMethod &  method,  
MFnFluid::FluidGradient &  gradient  
) 
Get the modes by which the velocity values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the fluid velocity in the grid is determined 
[out]  gradient  storage for returning the gradient type, which is only relevant if the method is kGradient 
MStatus MFnFluid::setTemperatureMode  (  MFnFluid::FluidMethod  method,  
MFnFluid::FluidGradient  gradient  
) 
Set the modes by which the temperature values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may have the following values:
[in]  method  method for determining the fluid temperature in the grid 
[in]  gradient  gradient type, only used if the method is kGradient 
MStatus MFnFluid::getTemperatureMode  (  MFnFluid::FluidMethod &  method,  
MFnFluid::FluidGradient &  gradient  
) 
Get the modes by which the temperature values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the fluid temperature in the grid is determined 
[out]  gradient  storage for returning the gradient type, which is only relevant if the method is kGradient 
MStatus MFnFluid::setFuelMode  (  MFnFluid::FluidMethod  method,  
MFnFluid::FluidGradient  gradient  
) 
Set the modes by which the fuel values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation. The fuel value for a cell can be thought of as the amount of fuel contained in the cell that will be consumed during the simulation.
The method parameter may have the following values:
If the method is set to be kGradient, then the gradient argument is also used. This deterines how a gradient is applied to the volume. The possible values are as follows:
[in]  method  method for determining the fluid fuel in the grid 
[in]  gradient  gradient type, only used if the method is kGradient 
MStatus MFnFluid::getFuelMode  (  MFnFluid::FluidMethod &  method,  
MFnFluid::FluidGradient &  gradient  
) 
Get the modes by which the fuel values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the fluid fuel values in the grid is determined 
[out]  gradient  storage for returning the gradient type, which is only relevant if the method is kGradient 
MStatus MFnFluid::setCoordinateMode  (  MFnFluid::CoordinateMethod  method  ) 
Set the modes by which the UVW coordinate values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may have the following values:
[in]  method  method for determining the fluid UVW coordinates in the grid 
MStatus MFnFluid::getCoordinateMode  (  MFnFluid::CoordinateMethod &  method  ) 
Get the modes by which the UVW coordinates values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the fluid coordinate values in the grid is determined 
MStatus MFnFluid::setColorMode  (  MFnFluid::ColorMethod  method  ) 
Set the modes by which the color values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may have the following values:
[in]  method  method for determining the fluid color in the grid 
MStatus MFnFluid::getColorMode  (  MFnFluid::ColorMethod &  method  ) 
Get the modes by which the color values in the grid are determined. The values may be set by the user in various ways, or they may be computed as part of a simulation.
The method parameter may return the following values:
[out]  method  storage for returning the method by which the fluid color in the grid is determined 
MStatus MFnFluid::getForceAtPoint  (  const MPointArray &  point,  
const MVectorArray &  velocity,  
const MDoubleArray &  mass,  
MVectorArray &  force,  
double  deltaTime =
1.0 / 24.0 

) 
Compute the force of the fluid as a field on an array of points, given their position, velocity, and mass.
This method uses MPointArray to represent the positions of points. If a point instance is in a rational form or a homogenous form, you should reset it to be in the cartesian form P(x, y, z, 1).
[in]  point  array of positions for each point. 
[in]  velocity  array of velocities for each point. If the length of the velocity array is 0, a velocity of 0.0 is assumed for all the points. 
[in]  mass  array of mass values for each point. If the length of the mass array is 0, a mass of 1.0 is assumed for all the points. 
[out]  force  output array of forces applied to each point. If the length of the force array supplied is 0, the array is automatically resized. If the contents of the force array contains data, the computed force is added to the supplied data. This can be useful to accumulate forces of multiple fields. 
[in]  deltaTime  time increment in seconds. Default is (1.0 / 24.0 fps). 
MStatus MFnFluid::getForceAtPoint  (  const MVectorArray &  point,  
const MVectorArray &  velocity,  
const MDoubleArray &  mass,  
MVectorArray &  force,  
double  deltaTime =
1.0 / 24.0 

) 
Compute the force of a field on an array of points, given their position, velocity, and mass. Note that only the Air and Vortex fields require a time increment to compute forces, all other fields will igonore this argument.
This method uses MVectorArray to represent the positions of a point.
[in]  point  array of positions for each point. 
[in]  velocity  array of velocities for each point. If the length of the velocity array is 0, a velocity of 0.0 is assumed for all the points. Note the velocity array is a requirement for the Air and Drag fields to compute forces. 
[in]  mass  array of mass values for each point. If the length of the mass array is 0, a mass of 1.0 is assumed for all the points. 
[out]  force  output array of forces applied to each point. If the length of the force array supplied is 0, the array is automatically resized. If the contents of the force array contains data, the computed force is added to the supplied data. This can be useful to accumulate forces of multiple fields. 
[in]  deltaTime  time increment in seconds for usage with the Air and Vortex fields. Default is (1.0 / 24.0 fps). 
bool MFnFluid::toGridIndex  (  const MPoint &  objectSpacePoint,  
int3 &  gridCoords,  
MStatus *  status = NULL 

) 
For the given point in object space, get the grid indices of the voxel that it happens to lie in. If the point is outside the fluid, the method returns false, and the indices should not be used.
[in]  objectSpacePoint  an object space location 
[out]  gridCoords  the voxel indices, if the point falls inside a voxel 
[out]  status  Status code 
For the given voxel, get the location of the center in object space. If the voxel indices are not valid, the point may not be set to a valid point
[in]  xi  the voxel x index 
[in]  yi  the voxel y index 
[in]  zi  the voxel z index 
[out]  objectSpacePoint  the object space location 
MStatus MFnFluid::updateGrid  (  ) 
Tells the fluid shape that the contents of the fluid grid has changed. It is necessary to call this routine after modifying internal fluid data via a pointer recieved from any of the access routines in this function set. Failure to call this will result in the fluid not drawing with your changes.
void MFnFluid::emitIntoArrays  (  float  val,  
int  x,  
int  y,  
int  z,  
float  density,  
float  heat,  
float  fuel,  
bool  doColor,  
const MColor &  emitColor  
) 
Use this method to add density, heat, fuel, and/or color to a particular voxel of a fluid.
[in]  val  multiplier applied to the specified density, heat, and fuel values. 
[in]  x  voxel index in x 
[in]  y  voxel index in y 
[in]  z  voxel index in z 
[in]  density  amount of density to add to the voxel 
[in]  heat  amount of heat to add to the voxel 
[in]  fuel  amount of fuel to add to the voxel 
[in]  doColor  if true, then color specified by "emitColor" will be blended into the voxel's current color, with the blend coefficients being determined by the amount of density that is being added to the voxel. 
[in]  emitColor  color to be blended into the voxel. 
int MFnFluid::index  (  int  xi,  
int  yi  
) 
This is a utility routine for finding the index of a cell in an array of fluid data. The data in the fluid shape, such as color and density are passed back as single dimensional arrays of numeric values. This method converts three dimensional coordinates of a cell into the index value that refers the cell's value in the single dimensional array.
Note that no bounds checking is performed.
[in]  xi  index in x 
[in]  yi  index in y 
int MFnFluid::index  (  int  xi,  
int  yi,  
int  zi  
) 
This is a utility routine for finding the index of a cell in an array of fluid data. The data in the fluid shape, such as color and density are passed back as single dimensional arrays of numeric values. This method converts three dimensional coordinates of a cell into the index value that refers the cell's value in the single dimensional array.
Note that no bounds checking is performed.
[in]  xi  index in x 
[in]  yi  index in y 
[in]  zi  index in z 
void MFnFluid::index  (  int  index,  
int &  xi,  
int &  yi,  
int &  zi  
) 
This is a utility routine for finding the coordinates of a cell in an array of fluid data given the index. The data in the fluid shape, such as color and density are passed back as single dimensional arrays of numeric values. This method converts the index value that refers to a cell's value in the single dimensional array into the three dimensional coordinates of the cell.
Note that no bounds checking is performed.
[in]  index  index to convert into coordinates 
[out]  xi  storage for the index in x 
[out]  yi  storage for the index in y 
[out]  zi  storage for the index in z 
int MFnFluid::index  (  int  xi,  
int  yi,  
int  zi,  
int  xres,  
int  yres,  
int  zres  
) 
This is a utility routine for finding the index of a cell given the X, Y and Z resolutions. This is intended for use primarily with the velocity arrays, where the resolutions are different for each array. The X velocity array is one bigger in X, etc.
This method converts three dimensional coordinates of a cell into the index value that refers the cell's value in the single dimensional array.
Note that no bounds checking is performed.
[in]  xi  index in x 
[in]  yi  index in y 
[in]  zi  index in z 
[in]  xres  resolution in x 
[in]  yres  resolution in y 
[in]  zres  resolution in z 
void MFnFluid::index  (  int  index,  
int  xres,  
int  yres,  
int  zres,  
int &  xi,  
int &  yi,  
int &  zi  
) 
This is a utility routine for finding the coordinates of a cell given the index, and the X, Y and Z resolutions. This is intended for use primarily with the velocity arrays, where the resolutions are different for each array. The X velocity array is one bigger in X, etc.
This method converts the index value that refers to a cell's value in the single dimensional array into the three dimensional coordinates of the cell.
Note that no bounds checking is performed.
[in]  index  index to convert into coordinates 
[in]  xres  resolution in x 
[in]  yres  resolution in y 
[in]  zres  resolution in z 
[out]  xi  storage for the index in x 
[out]  yi  storage for the index in y 
[out]  zi  storage for the index in z 
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