StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
13594568
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-11-27T22:46:05.243
FavoriteCount
0
LastActivityDate
2012-11-27T22:46:05.243
LastEditDate
LastEditorUserId
0
OwnerUserId
1294207
ParentId
13594285
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
I can see two good ways to do this. <ol> <li>If the points you are looking for are in some ordered axially aligned grid, then you can access the ones that are in a certain radius immediately. The way to do this is to get the x, y, z point and convert it to its grid position along with the radius to define the min and max grid positions for x, y, and z. You can then access those variables immediately. </li> <li>If the points are not in a form that's not axially aligned and ordered into a grid then you need to put it inot a form that will be quick to search. I would suggest the kd tree. It takes a searching operation from being <code>O(n)</code> to <code>O(log(n)</code>. The way it does it is to split the point set in half along the mean and repeat untill you have a fast searchable tree:</li> </ol> <img src="https://i.stack.imgur.com/GGODZ.gif" alt="enter image description here"> The PCL (point cloud Library) will do this for your as well! Here is a link: <a href="http://pointclouds.org/" rel="nofollow noreferrer">http://pointclouds.org/</a> And a tutorial on kd trees with pcl: <a href="http://pointclouds.org/documentation/tutorials/kdtree_search.php#kdtree-search" rel="nofollow noreferrer">http://pointclouds.org/documentation/tutorials/kdtree_search.php#kdtree-search</a> In fact it even shows you the code for a radius search from an entered point into a kd tree stored point cloud. Look at neighbours in radius search on the tutorial page i have provided. Good Luck!
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POSearching for data with similar properties in a structure
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USFantastic Mr Fox
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POSearching for data with similar properties in a structure
 singulars
 PostTypePostTypeId
 PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTAcceptedByOriginator
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.