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# Volume Visualization

## Functions

### Scalar Volume Data

### Vector Volume Data

## Topics

## Related Information

Representing gridded volume data as iso, slice, and
stream plots

`contourslice` |
Draw contours in volume slice planes |

`flow` |
Simple function of three variables |

`isocaps` |
Compute isosurface end-cap geometry |

`isocolors` |
Calculate isosurface and patch colors |

`isonormals` |
Compute normals of isosurface vertices |

`isosurface` |
Extract isosurface data from volume data |

`reducepatch` |
Reduce number of patch faces |

`reducevolume` |
Reduce number of elements in volume data set |

`shrinkfaces` |
Reduce size of patch faces |

`slice` |
Volumetric slice plot |

`smooth3` |
Smooth 3-D data |

`subvolume` |
Extract subset of volume data set |

`volumebounds` |
Coordinate and color limits for volume data |

`coneplot` |
Plot velocity vectors as cones in 3-D vector field |

`curl` |
Compute curl and angular velocity of vector field |

`divergence` |
Compute divergence of vector field |

`interpstreamspeed` |
Interpolate stream-line vertices from flow speed |

`stream2` |
Compute 2-D streamline data |

`stream3` |
Compute 3-D streamline data |

`streamline` |
Plot streamlines from 2-D or 3-D vector data |

`streamparticles` |
Plot stream particles |

`streamribbon` |
3-D stream ribbon plot from vector volume data |

`streamslice` |
Plot streamlines in slice planes |

`streamtube` |
Create 3-D stream tube plot |

**Overview of Volume Visualization**

Volume visualization is the creation of graphical representations of data sets that are defined on three-dimensional grids.

**Techniques for Visualizing Scalar Volume Data**

There are several techniques available for visualizing scalar volume data, such as MRI slices.

**Visualizing Vector Volume Data**

There are several techniques that are useful for visualizing vector data, such as stream lines, stream particles, stream ribbons, stream tubes, and cone plots.

**Exploring Volumes with Slice Planes**

A slice plane is a surface that takes on coloring based on the values of the volume data in the region where the slice is positioned.

**Connecting Equal Values with Isosurfaces**

Isosurfaces are constructed by creating a surface within the volume that has the same value at each vertex. Isosurface plots are similar to contour plots in that they both indicate where values are equal.

**Isocaps Add Context to Visualizations**

Isocaps are planes that are fitted to the limits of an isosurface to provide a visual context for the isosurface.

**Stream Line Plots of Vector Data**

This example shows how to use stream lines, slice planes, and contour lines in one graph.

**Displaying Curl with Stream Ribbons**

Stream ribbons illustrate direction of flow, similar to stream lines, but can also show rotation about the flow axis by twisting the ribbon-shaped flow line.

**Displaying Divergence with Stream Tubes**

Stream tubes are similar to stream lines, except the tubes have width, providing another dimension that you can use to represent information.

**Creating Stream Particle Animations**

A stream particle animation is useful for visualizing the flow direction and speed of a vector field. The particles trace the flow along a particular stream line.

**Vector Field Displayed with Cone Plots**

This example shows how to use cone plots, isosurfaces, lighting, and camera placement to visualize a vector field.

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