3D Transformations & Scene Setup

---

CONVERT_COORD - Transforms coordinates to and from the Direct Graphics coordinate system.

COORD2TO3 - Returns 3D data coordinates given Direct Graphics normalized screen coordinates.

CROSSP - Compute the cross product of two vectors.

CV_COORD - Converts 2D and 3D coordinates between coordinate systems.

SCALE3 - Sets up axis ranges and viewing angles for Direct Graphics 3D plots.

SCALE3D - Scales a Direct Graphics 3D unit cube into the viewing area.

SET_SHADING - Sets the light source shading parameters for Direct Graphics.

SURFR - Sets up 3D transformations for Direct Graphics.

T3D - Performs various Direct Graphics 3D transformations.

VERT_T3D - Transforms a Direct Graphics 3D array by a 4x4 transformation matrix.

Polygonal Mesh Routines

---

COMPUTE_MESH_NORMALS - Computes normal vectors for a set of polygons.

MESH_CLIP - Clips a polygonal mesh to an arbitrary plane in space.

MESH_DECIMATE - Reduces the density of geometry while preserving as much of the original data as possible.

MESH_ISSOLID - Computes various mesh properties and determines if a mesh encloses space (is a solid).

MESH_MERGE - Merges two polygonal meshes.

MESH_NUMTRIANGLES - Computes the number of triangles in a polygonal mesh.

MESH_OBJ - Generates a polygon mesh for various simple objects.

MESH_SMOOTH - Performs spatial smoothing on a polygon mesh.

MESH_SURFACEAREA - Determines the surface area of a mesh, including integration of other mesh properties.

MESH_VALIDATE - Checks for NaN values in vertices, removes unused vertices, and combines close vertices.

MESH_VOLUME - Computes the volume that the mesh encloses.

POLYSHADE - Creates a Direct Graphics shaded surface representation from a set of polygons.

Surfaces and Contours

---

CONTOUR - Draws a two-dimensional contour plot for a 2D array of data.

CONTOUR Procedure - Draws a Direct Graphics contour plot.

IMAGE_STATISTICS - Computes sample statistics for an N-dimensional array.

MIN_CURVE_SURF - Interpolates points with a minimum curvature surface or a thin-plate-spline surface.

POLAR_CONTOUR - Draws a Direct Graphics contour plot from polar-coordinate data in polar coordinates.

SHADE_SURF - Creates a Direct Graphics shaded-surface from gridded data.

SHADE_SURF_IRR - Creates a Direct Graphics shaded-surface from irregularly-gridded data.

SHOW3 - Displays a Direct Graphics image, surface plot, and contour plot simultaneously.

SURFACE - Draws a 3D surface from 2D data or unstructured points.

SURFACE Procedure - Draws a Direct Graphics surface.

Tetrahedral Mesh Routines

---

TETRA_CLIP - Clips a tetrahedral mesh to an arbitrary plane in space.

TETRA_SURFACE - Extracts a polygonal mesh as the exterior surface of a tetrahedral mesh.

TETRA_VOLUME - Computes properties of a tetrahedral mesh array.

Vector Field Visualization

---

FLOW3 - Draws Direct Graphics lines representing a 3D flow/velocity field.

INTERPOL - Performs linear interpolation on vectors.

PARTICLE_TRACE - Traces the path of a massless particle through a vector field.

STREAMLINE - Draws a streamline plot.

STREAMLINE Procedure = Draws a Direct Graphics streamline plot.

VECTOR - Draws a plot of either vectors or wind barbs.

VECTOR_FIELD - Places colored, oriented vectors of specified length at each vertex in an input vertex array.

VERT_T3D - Draws a Direct Graphics velocity (flow) field with streamlines.

Volume Visualization

---

EXTRACT_SLICE - Returns 2D planar slice extracted from volume.

IDLgrVRML - Saves the contents of an Object Graphics hierarchy into a VRML 2.0 format file.

INTERVAL_VOLUME - Generates a tetrahedral mesh from volumetric data.

ISOSURFACE - Returns topologically consistent triangles by using oriented tetrahedral decomposition.

PROJECT_VOL - Returns a translucent rendering of a volume projected onto a plane.

QGRID3 - Interpolates the dependent variable values to points in a regularly sampled volume.

QHULL - Constructs convex hulls, Delaunay triangulations, and Voronoi diagrams.

RECON3 - Reconstructs a 3D representation of an object from 2D images.

SEARCH3D - Finds objects or regions of similar data values within a volume.

SHADE_VOLUME - Contours a volume to create a list of vertices and polygons.

SLICER3 - Interactive Direct Graphics volume visualization tool.

VOXEL_PROJ - Generates a Direct Graphics volume visualization using voxel technique.

XOBJVIEW - Displays object viewer widget.

XOBJVIEW_ROTATE - Programmatically rotate an object.

XOBJVIEW_WRITE_IMAGE - Write the XOBJVIEW object to an image file.

XVOLUME - Direct Graphics utility for viewing and manipulating volumes and isosurfaces.