Hi there,
If I have been given a TIN and a point cloud, how can I find out which points are above the surface and which are below, without rasterizing the surface to retain maximum surface fidelity.
Thanks,
Marc
Userlevel 2
+17
- Safer
- 1582 replies
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22 January 2024
Hi @mgg_beca,
I think the simplest process would be to use an Extruder to extrude the TIN by a distance that will encompass the highest point in the point cloud. Then use a Clipper to clip the point cloud by the extruded TIN. Inside points will be above, while Outside points will be below.
If the TIN is a mesh geometry, you may need to use a GeometryCoercer to convert to a composite surface before extruding.
+7
- Contributor
- 55 replies
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22 January 2024
Hi @mgg_beca,
I think the simplest process would be to use an Extruder to extrude the TIN by a distance that will encompass the highest point in the point cloud. Then use a Clipper to clip the point cloud by the extruded TIN. Inside points will be above, while Outside points will be below.
If the TIN is a mesh geometry, you may need to use a GeometryCoercer to convert to a composite surface before extruding.
Hi @daveatsafe ,
I thought that might be the case, but figured I'd reach out and see if there was a more specific solution. I think there is definitely scope for a transformer to do this.
Regards,
Marc
+4
- Contributor
- 42 replies
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15 April 2024
I think I’ve done something similar in the past. I think I copied the z value to a new component (Zorig). Then ran through the surface draper. Then I took a difference of the old z and the new z. If its negative is below ground, positive above ground
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