Try using gluLookAt glClearColor(0.0, 0.0, 0.0, 1.0); glClear(GL_COLOR_BUFFER_BIT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); /* use this length so that camera is 1 unit away from origin */ double dist = sqrt(1 / 3.0); gluLookAt(dist, dist, dist, /* position of camera */ 0.0, 0.0, 0.0, /* where camera is pointing at */ 0.0, 1.0, 0.0); /* which direction is … Read more
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 know what projection, degree of rotation or bounding box … Read more
Edit: As the mongo-go driver evolved, it is possible to specify a projection using a simple bson.M like this: options.FindOne().SetProjection(bson.M{“_id”: 0}) Original (old) answer follows. The reason why it doesn’t work for you is because the field fields._id is unexported, and as such, no other package can access it (only the declaring package). You must … Read more
The ‘way it’s done’ is to use homogenous transformations and coordinates. You take a point in space and: Position it relative to the camera using the model matrix. Project it either orthographically or in perspective using the projection matrix. Apply the viewport trnasformation to place it on the screen. This gets pretty vague, but I’ll … Read more
with spring data you can cut the middle-man and simply define public interface IdsOnly { Integer getId(); String getOtherId(); } and use a native query like; @Query(value = “Id, OtherId from TestTable where CreationDate > ?1 and Type in (?2)”, nativeQuery = true) public Collection<IdsOnly> findEntriesAfterDate(Date creationDate, List<Integer> types); check out https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections
Perhaps the following illustration showing the relationship between the various spaces will help: Depending if you’re using the fixed-function pipeline (you are if you call glMatrixMode(), for example), or using shaders, the operations are identical – it’s just a matter of whether you code them directly in a shader, or the OpenGL pipeline aids in … Read more
Where did those variables come from These variables are chosen to match the computed coordinates to the background image of the map. If the projection parameters of the map were known, they could be computed. But I believe it is far more likely that they were obtained through trial and error. How to compute a … Read more
An approach of how to work with DTO in Spring Data REST projects The working example is here Entities Entities must implement the Identifiable interface. For example: @Entity public class Category implements Identifiable<Integer> { @Id @GeneratedValue private final Integer id; private final String name; @OneToMany private final Set<Product> products = new HashSet<>(); // skipped } … Read more
I wrote a function which does exactly what you were looking for. I know it’s a bit late, but maybe there are some other people interested in. You need a map which is a mercator projection and you need to know the lat / lon positions of your map. You get great customized mercator maps … Read more
The output of a vertex shader is a four component vector, vec4 gl_Position. From Section 13.6 Coordinate Transformations of core GL 4.4 spec: Clip coordinates for a vertex result from shader execution, which yields a vertex coordinate gl_Position. Perspective division on clip coordinates yields normalized device coordinates, followed by a viewport transformation (see section 13.6.1) … Read more