projection

Let's say I have a data structure like the following: Camera { double x, y, z /** ideally the camera angle is positioned to aim at the 0,0,0 point */ double angleX, angleY, angleZ; } SomePointIn3DSpace { double x, y, z } ScreenData { /** Convert from some point 3d space to 2d space, end up with x, y */ int x_screenPositionOfPt, y_screenPositionOfPt double zFar = 100; int width=640, height=480 } ... Without screen clipping or much of anything else, how would I calculate the screen x,y position of some point given some 3d point in space. I want to project that 3d point onto the 2d screen. Camera

I am a newbie in OpenGL programming with C++ and not very good at mathematics. Is there a simple way to have isometric projection? I mean the true isometric projection , not the general orthogonal projection. (Isometric projection happens only when projections of unit X, Y and Z vectors are equally long and angles between them are exactly 120 degrees.) Code snippets are highly appreciated.. cobbal 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 */

Spring Data REST automates exposing only domain object. But most often we have to deal with Data Transfer Objects. So how to do this in SDR way? 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 } @Entity public class Product implements Identifiable<Integer> { @Id

I know that in ng2 we have ComponentFactoryResolver that can resolve factories that we can apply to a ViewContainerRef . But, is there something similar for directives? a way to instantiate them and apply them to the projected content from a component? No, directives can't be added or removed dynamically. They are only applied to HTML statically added to component templates. What you could do is to enable/disable the directive by passing a parameter ( @Input() ) to the directive to notify it to do something or not. 来源： https://stackoverflow.com/questions/39563547/how-to-instantiate-and-apply

If linear interpolation happens during the rasterization stage in the OpenGL pipeline, and the vertices have already been transformed to screen-space, where does the depth information used for perspectively correct interpolation come from? Can anybody give a detailed description of how OpenGL goes from screen-space primitives to fragments with correctly interpolated values? 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