CloudCompare forum

Hello, I want to know if it is somehow possible to put a point matrix on the top of a point cloud. If we for instance have a half ball as a point cloud then I would like to make a matrix of points with a specific distance between the points in both x and y. (the matrix can be 50 x 50 points with 1 cm distance) that cover the whole ball.
I have tried to use the function "Subsample a Point Cloud" > Spaces....but in here I can not specify it accurate enough. After I have got the correct point matrix I need the xyz information to reproduce the ball in another software.

Is there any solution to this, how this can be solved?

Thank!

I think the "Tools > Projection > Rasterize (...)" tool is what you're looking for.

Or did I missed something?

Thanks a lot, that is the right function I was searching for!

Is it possible to specify the area this matrix should cover of the point cloud? and also the position of the matrix, so I for instance get a line of points in the center of the ball (center goes from the highest point on the ball)?

You can edit the grid extents in 2D (with the 'Edit grid' button) but I guess you already found that out?

Hello,

I see that option to edit, but cant get it to work as I want.

I would like to specify exactly where the center line in my point cloud object is, so a line of point in the grid matching the center line of the object.
How is that possible to do?

Another question I have if I use the segment tool on the new grid I make, is it then possible just to save / export the points again, without do a new "Grid generation"?

To make what you want you'll have to do some maths I guess.

And otherwise, you can of course export any cloud anytime by selecting it and using "File > Save". Or have I once again misunderstood you? ;)

OK, I was just hoping that there was an easy way to tell the software where I would like the grid to start. Maybe I just have to work a little more with it.

About the saving, I don't get the same CSV/txt file when I do save it in File > Save, here I only get the CSV file as a point cloud. What I was asking about was how I could save the "grid points" depth with my specified distance in txt file after I have done a "segment" on the grid.

Now another tricky question came up: is it possible to specify how the points in the "grid generation" coming into excel. At the moment I have to turn the grid in Excel 180° degrees to get it in the right way for further processing. Can CC help with that?

Ah ok, this way to export the grid as a matrix is indeed only available in the "Rasterize" tool. It has been coded long ago so it's fairly simple. There's no option to transpose the matrix.