Hello

I have 10 000 points in a drawing (villages in an African country)

I want to draw voronoi areas delimited by a 3km max. distance. Something like :

I am used to do so in Manifold8 : create 2 drawings : buffer & voronoi areas, and then clip. Works fine, done in ~5mn.

I thought I can do it even faster in Manifold 9. I did the same, I added a drawing with the Voronoi Areas, a drawing with the 3km buffer. Then I created a map and went to Transform/Clip... But Manifold 9 was computing only 2 object per second!

M8 had finished the job before M9. I certainly got something wrong in my M9 workflow...

Your answer is here

Summary, use the Overlay Transform (intersect)

thank you

Muscle memory still gets me every so often. Run the Clip, see the progress, and realise "wrong transform"!

have done the following:

1: Create a buffer around the points

2: Generate a Voronoi diagram

3: Use the Join Dialog to copy the mfd_id of the points to the voronoi areas

4. Run the following query

--SQL9

TABLE CALL TableCacheIndexGeoms(

(

SELECT

 b.[mfd_id]

 , GeomClip(b.[geom_buffer], v.[geom], true, 0)

FROM

 [Buffer] AS b

LEFT JOIN

 [Voronoi] AS v

ON

 b.[mfd_id] = v.[point_id]

), TRUE)

Attachments:
clipped.png

http://www.mppng.nl/manifold/pointlabeler