# ProjectionPointOnPlane3D

The ProjectionPointOnPlane3D function constructs a 3D point from the projection of a specified Point3D structure onto the specified Plane3D structure. The constructed projection is returned as a Point3D structure.

## ProjectionPointOnPlane3D Inputs

The ProjectionPointOnPlane3D function has the following syntax:

ProjectionLineOnPlane3D(PointCloud,Point3D,ExternalPoint,Plane3D,ExternalPlane,Show)

See the table for a description of the available parameters.

Parameter | Description
PointCloud | Reference to a cell containing a point cloud. The default value is $A$0.
Point3D | Specifies the offset of the 3D point to use. It is offset from the PointCloud (or Fixture3D, if Fixture Reference is enabled) origin in the following format with the following arguments: {X, Y, Z}
X | Offset on the X-axis from the PointCloud origin.
Y | Offset on the Y-axis from the PointCloud origin.
Z | Offset on the Z-axis from the PointCloud origin.
Note: This parameter is available only if External Point is set to 0.
External Point | Specifies a reference to a Point3D structure defined in another cell to be used by the function. Set to 0 (OFF) to use the function's internal Point3D structure.
Plane3D | Specifies the offset and the angle of the plane to use. It is offset from the PointCloud origin in the following format with the following arguments: {X, Y, Z, Tilt, TiltDirection}
X | Offset on the X-axis from the PointCloud origin.
Y | Offset on the Y-axis from the PointCloud origin.
Z | Offset on the Z-axis from the PointCloud origin.
Tilt | Specifies the tilt angle (in degrees) from the PointCloud Z-axis. The value range is 0-180. External references with values outside the allowed range will result in an error.
Tilt Direction | Specifies the direction of tilt (in degrees) from the plane's rotated PointCloud X-axis, about the tool's PointCloud Z-axis. The value range is -360 - 360. External references with values outside the allowed range will be normalized to the allowed range.
Note: This parameter is available only if External Plane is set to 0.
External Plane | Specifies a reference to a Rectangle3D or Circle3D structure defined in another cell to be used by the function. Set to 0 (OFF) to use the function's internal Plane3D structure instead.
Show | Selects the type of graphics to overlay on the image.
0 = hide all (default) | All graphics will be hidden, except when the cell containing the function is highlighted in the spreadsheet.
1 = result graphics only | The constructed line will be displayed at all times.
2 = input graphics only | The input point cloud, the region of interest, and the constructed line will be displayed at all times.

## ProjectionPointOnPlane3D Outputs

Returns | A Point3D data structure containing the constructed 3D point, or #ERR if any of the input parameters are invalid.
Results | When initially inserted into a cell, the following functions are automatically inserted into the spreadsheet to create a result table.
| X | Y | Z
❒Point3D | GetX(Point3D) | GetY(Point3D) | GetZ(Point3D)

## ProjectionPointOnPlane3D Vision Data Access functions

The following Structures 3D Vision Data Access functions are automatically inserted into the spreadsheet to create the result table:

Function | Description
GetX(Point3D) | Returns the X-axis coordinate of the 3D point.
GetY(Point3D) | Returns the Y-axis coordinate of the 3D point.
GetZ(Point3D) | Returns the Z-axis coordinate of the 3D point.