FreeMat: vtkTextureMapToSphere

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vtkTextureMapToSphere

Section: Visualization Toolkit Graphics Classes

# Usage

vtkTextureMapToSphere is a filter that generates 2D texture coordinates by mapping input dataset points onto a sphere. The sphere can either be user specified or generated automatically. (The sphere is generated automatically by computing the center (i.e., averaged coordinates) of the sphere.) Note that the generated texture coordinates range between (0,1). The s-coordinate lies in the angular direction around the z-axis, measured counter-clockwise from the x-axis. The t-coordinate lies in the angular direction measured down from the north pole towards the south pole.

A special ivar controls how the s-coordinate is generated. If PreventSeam is set to true, the s-texture varies from 0->1 and then 1->0 (corresponding to angles of 0->180 and 180->360).

To create an instance of class vtkTextureMapToSphere, simply invoke its constructor as follows

      obj = vtkTextureMapToSphere

# Methods

The class vtkTextureMapToSphere has several methods that can be used. They are listed below. Note that the documentation is translated automatically from the VTK sources, and may not be completely intelligible. When in doubt, consult the VTK website. In the methods listed below, `obj` is an instance of the vtkTextureMapToSphere class.

- `string = obj.GetClassName ()`
- `int = obj.IsA (string name)`
- `vtkTextureMapToSphere = obj.NewInstance ()`
- `vtkTextureMapToSphere = obj.SafeDownCast (vtkObject o)`
- `obj.SetCenter (double , double , double )` - Specify a point defining the center of the sphere.
- `obj.SetCenter (double a[3])` - Specify a point defining the center of the sphere.
- `double = obj. GetCenter ()` - Specify a point defining the center of the sphere.
- `obj.SetAutomaticSphereGeneration (int )` - Turn on/off automatic sphere generation. This means it automatically finds the sphere center.
- `int = obj.GetAutomaticSphereGeneration ()` - Turn on/off automatic sphere generation. This means it automatically finds the sphere center.
- `obj.AutomaticSphereGenerationOn ()` - Turn on/off automatic sphere generation. This means it automatically finds the sphere center.
- `obj.AutomaticSphereGenerationOff ()` - Turn on/off automatic sphere generation. This means it automatically finds the sphere center.
- `obj.SetPreventSeam (int )` - Control how the texture coordinates are generated. If PreventSeam is set, the s-coordinate ranges from 0->1 and 1->0 corresponding to the theta angle variation between 0->180 and 180->0 degrees. Otherwise, the s-coordinate ranges from 0->1 between 0->360 degrees.
- `int = obj.GetPreventSeam ()` - Control how the texture coordinates are generated. If PreventSeam is set, the s-coordinate ranges from 0->1 and 1->0 corresponding to the theta angle variation between 0->180 and 180->0 degrees. Otherwise, the s-coordinate ranges from 0->1 between 0->360 degrees.
- `obj.PreventSeamOn ()` - Control how the texture coordinates are generated. If PreventSeam is set, the s-coordinate ranges from 0->1 and 1->0 corresponding to the theta angle variation between 0->180 and 180->0 degrees. Otherwise, the s-coordinate ranges from 0->1 between 0->360 degrees.
- `obj.PreventSeamOff ()` - Control how the texture coordinates are generated. If PreventSeam is set, the s-coordinate ranges from 0->1 and 1->0 corresponding to the theta angle variation between 0->180 and 180->0 degrees. Otherwise, the s-coordinate ranges from 0->1 between 0->360 degrees.