Click3dPoint

Select a point from a 3D point cloud by clicking on it.

Description

Lets the user select a point from a 3D point cloud by clicking on it. The selected point is highlighted and its index is printed.

This is a useful tool if you work with 3D point clouds. You can change the mouse click callback function so instead of highlighting the selected point other operations are done.

The math is pretty simple:

First, the transformation between the viewing frame and the point cloud frame is calculated using the camera viewing direction and the 'up' vector. Then, the point cloud is transformed into the viewing frame. Finally, The z coordinate in this frame is ignored and the x and y coordinates of all the points are compared with the mouse click location and the closest point is selected.

Acknowledgements

This file inspired Get Rotation Matrix From 2 Orthogonal Planes and Estimate Rigid Transform.

• MATLAB release: MATLAB 7.8 (R2009a)

[Jawahir]

 

[Anton Semechko]

 

[Shane]

 

[Shane]

 

[Vladislavs]

Exactly what was needed. Great work.

[Kourosh Khoshelham]

This is very useful. I need to output the coordinates of the point to use elsewhere, do you know how I can do that? I tried guidata but it didn't work.

thanks,
Kourosh

[Alberto Gallina]

simple and useful

[David]

great job

[Jveer]

thank you. that worked great. re-rating.

[Babak Taati]

to Jveer:

>> set(gcf,'WindowButtonDownFcn','');

better: change ClickA3DPoint.m so it returns a handle to the figure and use that instea of gcf.

[Jveer]

useful but once activated, how can you disactivate it?

[Ditza Fargeon]

This is really nice function

[Adam Nolan]

handy template for working with 3D Plot selection