# projecting points onto 3D polydata
**URL:** https://discourse.vtk.org/t/projecting-points-onto-3d-polydata/9970
**Category:** Support
**Created:** [November 27, 2022, 11:11pm UTC](https://discourse.vtk.org/t/projecting-points-onto-3d-polydata/9970 "2022-11-27T23:11:23Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@AndreAhmed](https://discourse.vtk.org/u/AndreAhmed)
#### Post date: [November 27, 2022, 11:11pm UTC](https://discourse.vtk.org/t/projecting-points-onto-3d-polydata/9970/1 "2022-11-27T23:11:23Z")
I have a curve of points, and they are in 3D, I would like to project those points onto a 3D Polydata mesh. is there a filter ?
---
### Author:  [@marcomusy](https://discourse.vtk.org/u/marcomusy)
#### Post date: [November 28, 2022, 11:54am UTC](https://discourse.vtk.org/t/projecting-points-onto-3d-polydata/9970/2 "2022-11-28T11:54:05Z")
cannot think of a specific filter but you can use `vtkOBBTree.IntersectWithLine`, eg. quick test:
```python
from vedo import *
psh = ParametricShape("Boy").c("blue9")
cir = Circle(r=0.4).c("black").wireframe().rotate_x(20).z(2)
pts = []
for p in cir.points():
pts.append(psh.intersect_with_line(p, p + [0,0,-3])[0])
show(psh, cir, Line(pts), axes=1)
```
