3D Surface-Surface Perpendicularity

Operator Function

Calculate geometric tolerance - Surface-Surface Perpendicularity

As shown in the figure below, using the normal vector perpendicular to the reference plane as the tolerance band plane normal vector, uniformly select several sampling points on the measured surface, and calculate the signed distance from each sampling point to the reference tolerance band plane, denoted as 𝑑1, 𝑑2, ..., 𝑑n. The surface-surface perpendicularity calculation formula is:
𝑑𝑚𝑎𝑥 − 𝑑𝑚𝑖𝑛
Where
𝑑𝑚𝑎𝑥 = 𝑚𝑎𝑥(𝑑1, 𝑑2, ..., 𝑑n)
𝑑𝑚𝑖𝑛 = min(𝑑1, 𝑑2, ..., 𝑑n)

Parameter Introduction

Input Parameters

Parameter	Range	Default Value	Description	Illustration
Input Image	0-8	0	The IM number for image input

Calculation Parameters

Parameter	Range	Default Value	Description	Illustration
Actual Plane	Plane	-	A point on the actual plane and its normal vector
Reference Plane	Plane	-	A point on the reference plane and its normal vector
Measurement Point File	json file	-	Measurement point file on the plane being tested

Result Display

Parameter	Range	Default Value	Description	Illustration
Actual Plane	true/false	false	The input actual plane. If enabled, displayed on IM
Reference Plane	true/false	false	The input reference plane. If enabled, displayed on IM
Tolerance Band Plane	true/false	false	The displayed tolerance band plane is determined by a point on the intersection line of the reference plane and the actual plane, and the normal vector perpendicular to the reference plane as the tolerance band plane normal vector. If enabled, displayed on IM
Intersection	true/false	false	The perpendicular feet from the input measurement points to the actual plane. If enabled, displayed on IM
Measurement Points and Fitted Reference Plane Intersection Connections	true/false	false	Displays two sets of points: the measurement points and the perpendicular feet from the input measurement points to the tolerance band plane
Perpendicularity	true/false	false	The output perpendicularity. If enabled, displayed on IM

Output Parameters

Name	Type	Range	Description
Result	bool	true/false	true for success false for failure
Warning	bool	true/false	true indicates a warning false indicates no warning
Message	string		Output success, error, or warning messages. Empty if no error or warning.
Time	float		Operator execution time, unit: ms
distance	float[]		Distance from sampling points to the reference plane
parallelism	float		Perpendicularity
result	string	OK/NG	Whether the perpendicularity is within range

Tip

For more detailed parameter type descriptions, please refer to Type Definition

Exception Troubleshooting

No.	Exception Information	Corresponding Parameter	Solution
1	Input point cloud is empty		Confirm whether the IM contains valid points. If not, load a point cloud or switch to an IM with valid points
2	Input actual plane type is {0}, invalid plane type	Plane Type	Check if the plane type is Plane
3	Input plane normal vector is 0		Check if the plane normal vector is all zeros
4	Input perpendicularity range minimum is greater than maximum, invalid perpendicularity range		Set the perpendicularity range minimum to be less than or equal to the maximum
5	Parameter {0} cannot be empty	Path	Check if the path is empty
6	File {0} does not exist or cannot be accessed	Path	Check if the path is valid
7	Input theoretical position point cloud is empty		Check if the theoretical position point json file is empty
8	Input reference line type is {0}, invalid reference line type	Reference Line Type	Check if the reference line type is 3D Line

Example Introduction

Engineering Design

1. Select the Load Point Cloud tool to load the 3D point cloud to be processed into IM0;

2. Select the 3D Square Probe tool to fit the actual plane.

3. Select the 3D Square Probe tool to fit the reference plane.

4. Select the 3D Surface-Surface Perpendicularity tool.

Tool Usage

1. Select the input image to be operated on. The image number must match the IM number of the image in the project.

2. Do not enable region parameters, or enable region and select the region type as Box. Move the box to the position to be tested, surrounding the point cloud to be tested.

Usage Tips

1. Drag or scale the box through the ROI controller on the image window;
2. Directly modify the start or end coordinates of the box in the calculation parameters to adjust the box position and size

3. Set parameters

4. Check the desired display content in the result display section

5. Click Test to check if the image window and parameters meet expectations

6. If there are no issues, click Save. Run the operator in the run list to view the running results in the corresponding IM.