Table Of Contents

Geometry Fitting (G Dataflow)

Version:
    Last Modified: March 15, 2017

    Determines the best spherical fit on a cloud of points in 3D.

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    x

    x coordinates of the points of the cloud.

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    y

    y coordinates of the points of the cloud.

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    z

    z coordinates of the points of the cloud.

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    x0, y0, z0

    Calculated midpoints of the given cloud.

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    radius

    Calculated radius of the given cloud.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Algorithm for Calculating the Best Spherical Fit

    The min-functional is to find x0, y0, z0 and r with

    i = 1 n ( ( x i x 0 ) 2 + ( y i y 0 ) 2 + ( z i z 0 ) 2 r 2 ) 2 = min

    This leads to a simple linear equation in x0, y0, z0 where (xi, yi, zi) are the given points, (x0, y0, z0) is the unknown midpoint, and r is the unknown radius.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: This product does not support FPGA devices


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