projection

How to use $elemMatch on aggregate's projection?

时光总嘲笑我的痴心妄想 提交于 2019-11-29 17:26:38
问题 This is my object: { "_id" : ObjectId("53fdcb6796cb9b9aa86f05b9"), "list" : [ "a", "b" ], "complist" : [ { "a" : "a", "b" : "b" }, { "a" : "c", "b" : "d" } ] } And this is what I want to accomplish: check if "list" contains a certain element and get only the field "a" from the objects on "complist" while reading the document regardless of any of these values. I'm building a forum system, this is the query that will return the details of a forum. I need to read the forum information while

How to do a shader to convert to azimuthal_equidistant

守給你的承諾、 提交于 2019-11-29 17:13:44
I have a 360 texture in Equirectangular Projection. With what GLSL shader can I convert it into a azimuthal equidistant projection ? See also: http://earth.nullschool.net/#current/wind/isobaric/500hPa/azimuthal_equidistant=24.64,98.15,169 I would do it in Fragment shader. bind Equirectangular texture as 2D texture bind projection shader draw Quad covering the screen or target texture store or use the result. In Vertex shader I would: Just pass the vertex coordinates as varying to fragment shader (no point using matrices here you can directly use x,y coordinates in range <-1,+1> ) In fragment

Include with projection does not work

穿精又带淫゛_ 提交于 2019-11-29 14:55:11
I have this query var test = context.Assignments .Include(a => a.Customer) .Include(a => a.Subscriptions) .Select(a => new AssignmentWithSubscriptionCount { SubscriptionCount = a.Subscriptions.Count(), Assignment = a }) .ToList(); var name = test.First().Assignment.Customer.Name; It failes to eagerly load Customer, I've seen similar problems here on stackoverflow and it looks like you cant use projections with include. But I have not found a solution to my problem.. Anyone? edit: Here is a eager load with projection that work, its more complex than the example above so I cant for my life

Converting EPSG projection bounds to a D3.js

徘徊边缘 提交于 2019-11-29 14:22:57
Given an EPSG projection (say, this Alabama one: [ http://spatialreference.org/ref/epsg/26729/][1] ) How can you take the given WGS84 projection bounds in such a way that you can use them in a D3.js projection. For example, how would you know what projection, degree of rotation or bounding box to use to show the map? Andrew Reid This is a fairly complex question. The answer will differ based on the spatial reference (SRS, or coordinate reference system(CRS)) system you are looking at and what your ultimate goal is. I am using d3.js v4 in this answer Short Answer: For example, how would you

Spring JPA native query with Projection gives “ConverterNotFoundException”

回眸只為那壹抹淺笑 提交于 2019-11-29 13:21:15
I'm using Spring JPA and I need to have a native query. With that query, I need to get only two fields from the table, so I'm trying to use Projections . It isn't working, this is the error I'm getting: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] to type [com.example.IdsOnly] I tried to follow precisely the instructions of that page I linked, I tried to make my query non-native (do I actually need it to be native if I use projections

what is a projection in LINQ, as in .Select()

為{幸葍}努か 提交于 2019-11-29 09:32:37
I typically do mobile app development, which doesn't always have .Select. However, I've seen this used a bit, but I don't really know what it does or how it's doing whatever it does. It is anything like from a in list select a // a.Property // new Thing { a.Property} I'm asking because when I've seen code using .Select(), I was a bit confused by what it was doing. .Select() is from method syntax for LINQ, select in your code from a in list select a is for query syntax. Both are same, query syntax compiles into method syntax. You may see: Query Syntax and Method Syntax in LINQ (C#) Projection:

SQL DateDifference in a where clause

独自空忆成欢 提交于 2019-11-29 09:10:09
问题 I m doing a query as follows: SELECT * FROM a WHERE DATEDIFF(D, a.DateValue, DateTimeNow) < 3; and not working I m trying to get the data that s not older than 3 days. SQL server. How to do this? DATEDIFF works too slow.. 回答1: DateDiff is extremely fast... Your problem is you are running it on the database table column value, so the query processor must run the function on every row in the table, even if there was an index on this column. This means it has to load the entire table from disk.

How do I methodically choose the near clip plane distance for a perspective projection?

夙愿已清 提交于 2019-11-29 06:55:49
问题 I have a 3D scene and a camera defined using gluPerspective. I have a fixed FOV, and I know the minimum distance of any geometry to the camera (it is a first-person view, so that is the minimum distance from the viewpoint to the character's collision volume). How can I choose the farthest near clip plane (for the best depth buffer resolution) which will will not cause any clipping , no matter how the player moves and looks? These distances are not simply equal because the corners of the near

Kinect intrinsic parameters from field of view

こ雲淡風輕ζ 提交于 2019-11-28 19:42:05
Microsoft state that the field of view angles for the Kinect are 43 degrees vertical and 57 horizontal (stated here ) . Given these, can we calculate the intrinsic parameters i.e. focal point and centre of projection? I assume centre of projection can be given as (0,0,0)? Thanks EDIT: some more information on what I'm trying to do I have a dataset of images recorded with a Kinect, I am trying to convert pixel positions (x_screen,y_screen and z_world (in mm)) to real world coordinates. If I know the camera is placed at point (x',y',z') in the real world coordinate system, is it sufficient to

How to apply a transformation matrix?

大城市里の小女人 提交于 2019-11-28 19:41:50
I am trying to get the 2D screen coordinates of a point in 3D space, i.e. I know the location of the camera its pan, tilt and roll and I have the 3D x,y,z coordinates of a point I wish to project. I am having difficulty understanding transformation/projection matrices and I was hoping some intelligent people here could help me along ;) Here is my test code I have thrown together thus far: public class TransformTest { public static void main(String[] args) { // set up a world point (Point to Project) double[] wp = {100, 100, 1}; // set up the projection centre (Camera Location) double[] pc =