# Select mesh elements by location¶

## Functionality¶

This node allows to select mesh elements (vertices, edges and faces) by their geometrical location, by one of supported criteria.

You can combine different criteria by applying several instances of this node and combining masks with Logic node.

## Inputs¶

This node has the following inputs:

• Vertices
• Edges
• Faces
• Direction. Direction vector. Used in modes: By side, By normal, By plane, By cylinder. Exact meaning depends on selected mode.
• Center. Center or base point. Used in modes: By sphere, By plane, By cylinder, By bounding box.
• Percent. How many vertices to select. Used in modes: By side, By normal.
• Radius. Allowed distance from center, or line, or plane, to selected vertices. Used in modes: By sphere, By plane, By cylinder, By bounding box.

## Parameters¶

This node has the following parameters:

• Mode. Criteria type to apply. Supported criterias are:
• By side. Selects vertices that are located at one side of mesh. The side is specified by Direction input. So you can select “rightmost” vertices by passing (0, 0, 1) as Direction. Number of vertices to select is controlled by Percent input: 1% means select only “most rightmost” vertices, 99% means select “all but most leftmost”. More exactly, this mode selects vertex V if (Direction, V) >= max - Percent * (max - min), where max and min are maximum and minimum values of that scalar product amongst all vertices.
• By normal direction. Selects faces, that have normal vectors pointing in specified Direction. So you can select “faces looking to right”. Number of faces to select is controlled by Percent input, similar to By side mode. More exactly, this mode selects face F if (Direction, Normal(F)) >= max - Percent * (max - min), where max and min are maximum and minimum values of that scalar product amongst all vertices.
• By center and radius. Selects vertices, which are within Radius from specified Center; in other words, it selects vertices that are located inside given sphere. More exactly, this mode selects vertex V if Distance(V, Center) <= Radius. This mode also supports passing many points to Center input; in this case, “Distance” is distance from vertex to the nearest “Center”.
• By plane. Selects vertices, which are within Radius from specified plane. Plane is specified by providing normal vector (Direction input) and a point, belonging to that plane (Center input). For example, if you specify Direction = (0, 0, 1) and Center = (0, 0, 0), the plane will by OXY. More exactly, this mode selects vertex V if Distance(V, Plane) <= Radius.
• By cylinder. Selects vertices, which are within Radius from specified straight line. Line is specified by providing directing vector (Direction input) and a point, belonging to that line (Center input). For example, if you specify Direction = (0, 0, 1) and Center = (0, 0, 0), the line will by Z axis. More exactly, this mode selects vertex V if Distance(V, Line) <= Radius.
• By edge direction. Selects edges, which are nearly parallel to specified Direction vector. Note that this mode considers edges as non-directed; as a result, you can change sign of all coordinates of Direction and it will not affect output. More exactly, this mode selects edge E if Abs(Cos(Angle(E, Direction))) >= max - Percent * (max - min), where max and min are maximum and minimum values of that cosine.
• Normal pointing outside. Selects faces, that have normal vectors pointing outside from specified Center. So you can select “faces looking outside”. Number of faces to select is controlled by Percent input. More exactly, this mode selects face F if Angle(Center(F) - Center, Normal(F)) >= max - Percent * (max - min), where max and min are maximum and minimum values of that angle.
• By bounding box. Selects vertices, that are within bounding box defined by points passed into Center input. Radius is interpreted as tolerance limit. For examples:
• If one point (0, 0, 0) is passed, and Radius = 1, then the node will select all vertices that have -1 <= X <= 1, -1 <= Y <= 1, -1 <= Z <= 1.
• If points (0, 0, 0), (1, 2, 3) are passed, and Radius = 0.5, then the node will select all vertices that have -0.5 <= X <= 1.5, -0.5 <= Y <= 2.5, -0.5 <= Z <= 3.5.
• Include partial selection. Not available in By normal mode. All other modes select vertices first. This parameter controls either we need to select edges and faces that have any of vertices selected (Include partial = True), or only edges and faces that have all vertices selected (Include partial = False).

## Outputs¶

This node has the following outputs:

• EdgesMask. Mask for selected edges. Please note that this mask relates to list of vertices provided at node input, not list of vertices selected by this node.
• FacesMask. Mask for selected faces. Please note that this mask relates to list of vertices provided at node input, not list of vertices selected by this node.

## Examples of usage¶

Select rightmost vertices: Select faces looking to right: Select vertices within sphere: Using multiple centers: Select vertices near OYZ plane: Select vertices near vertical line: Bevel only edges that are parallel to Z axis: Select faces that are looking outside: Select faces by bounding box: 