# How to calculate the closest distance between a control point and a model node
**URL:** https://discourse.slicer.org/t/how-to-calculate-the-closest-distance-between-a-control-point-and-a-model-node/25151
**Category:** Support
**Created:** [September 8, 2022, 8:30am UTC](https://discourse.slicer.org/t/how-to-calculate-the-closest-distance-between-a-control-point-and-a-model-node/25151 "2022-09-08T08:30:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@1023185654](https://discourse.slicer.org/u/1023185654)
#### Post date: [September 8, 2022, 8:30am UTC](https://discourse.slicer.org/t/how-to-calculate-the-closest-distance-between-a-control-point-and-a-model-node/25151/1 "2022-09-08T08:30:49Z")
hello, everyone, i have a need. how to calculate the closest distance between a control point and a model node? or here is two model node in the 3D view ,is there any good way to help me know which model did I choose with python code
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### Author:  [@1023185654](https://discourse.slicer.org/u/1023185654)
#### Post date: [September 8, 2022, 8:42am UTC](https://discourse.slicer.org/t/how-to-calculate-the-closest-distance-between-a-control-point-and-a-model-node/25151/2 "2022-09-08T08:42:44Z")
When click the mouse on 3D view, the selected model will be change the color , how do i achieve that?
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### Author:  [@1023185654](https://discourse.slicer.org/u/1023185654)
#### Post date: [September 9, 2022, 6:20am UTC](https://discourse.slicer.org/t/how-to-calculate-the-closest-distance-between-a-control-point-and-a-model-node/25151/3 "2022-09-09T06:20:36Z")
@lassoan , hope to get a reply