Reduce Options

Use the options to set what happens when you select Mesh > Reduce.

Settings

Keep original

The original mesh is preserved for the purpose of using the paint weights features. See Mesh Tools > Paint Reduce Weights Tool.

Reduction Method

Reduction method
Lets you reduce the number of polygons by specific values. Select from the following options:
Note: The Reduce feature attempts to reach the specified number entered in the Vertex limit or Triangle limit field; however, if Preserve quads or other Feature Preservation options are enabled, the number of vertices or triangles in the reduced mesh may differ from the specified count.
Percentage
Lets you reduce the number of polygons by a percentage of the original polygon count using the Percentage slider.
Vertex limit
Lets you set the number of vertices in the output mesh using the Vetex limit field.
Triangle limit
Lets you set the number of triangles in the output mesh using the Triangle limit field.

Shape

Preserve quads
Attempts to maintain any existing quad topology on the mesh as it reduces. The slider range is between 0 and 1. The higher the value, the more quads in the final result. A value of 0 is equivalent to turning this option off. Reduce the slider value if the reduction results in an undesirable shape change.
Sharpness
Controls the balance between preserving small, sharp details versus larger shapes. At low values, details that are small and relative to the general shape of the object are more likely to be collapsed. At high values, they are more likely to be kept.
Symmetry type

Lets you select from the following options:

Note: Preserve quads must be set to < 1.0 to use the Symmetry type options.
None
Turns symmetric reduction off. This is the default setting.
Automatic
Adds a symmetry plane to your output mesh so reduction is symmetric about the plane Maya selects. With this option selected, Maya decides which plane (XZ, XY, or YZ) is most symmetric. It also tries symmetry about the center of mass, which works well for regular shapes that aren't aligned to the X, Y, or Z axes.
Plane
Adds a symmetry plane to your output mesh so reduction is symmetric about the specified plane.
Symmetry tolerance
Controls the degree to which Maya looks to see if two points are symmetric across the symmetry plane, as a value of 0 to 1.
Symmetry plane
Specifies the axes for the symmetry plane. Select XZ, XY, or YZ when Symmetry type is set to Planar.

Feature Preservation

The Feature Preservation options help to preserve specific features during the reduction process. Use the sliders to control the priority given to preserving different edges and borders.

Mesh borders
Attempts to preserve the shape of polygon borders (edges that are not shared by other polygons) as it reduces.
Tip: Set Mesh borders to 1 to preserve the boundary of your original selection.
UV borders

Attempts to preserve the shape of UV borders as it reduces.

Turning this on can give unpredictable results if you have a lot of UV borders. Try sewing as many UV pieces together as possible before reducing.

Note: If a polygonal surface has numerous UV seams on it and if the Mesh > Reduce operation is performed with UV borders turned on, there is a good chance the object will not reduce at all, since the reduction algorithm is attempting to maintain the UV borders (seams) that are on the object.

If you don’t mind losing your UV seams, turn off UV borders to successfully reduce your polygonal surface.

Color borders
Attempts to preserve the shape of color borders as it reduces.
Material borders
Attempts to preserve the shape of material borders as it reduces.
Hard edges

Attempts to preserve the shape of edges marked “hard” as it reduces.

You can set edges on a mesh to be hard or soft using Mesh Display > Soften Edge or Mesh Display > Harden Edge. Marking edges as “hard” can result in more shape retention than painting reduction weights.

Crease edges
Attempts to preserve the shape of edges that have crease values set as it reduces.

You can crease edges on a mesh using the Crease Tool. See Crease polygonal edges and vertices.

Advanced options

Vertex index map
Lets you export a vertex index map. To make relationships between vertices of your original mesh and output mesh, enter a name in the field to create a new color set. With the color set applied, you can look at a vertex in your output mesh and determine the index in the original mesh based on color. See Polygon color sets.

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