sphere | Python implementation of the amazing S2 Geometry Library | Dataset library

 by   qedus Python Version: Current License: MIT

kandi X-RAY | sphere Summary

kandi X-RAY | sphere Summary

sphere is a Python library typically used in Artificial Intelligence, Dataset applications. sphere has no vulnerabilities, it has a Permissive License and it has low support. However sphere has 4 bugs and it build file is not available. You can download it from GitHub.

Python implementation of the amazing C++ [S2 Geometry Library] The S2 Geometry Library is explained in more detail [here] It basically maps a sphere to a 1D index. This allows you to do scalable proximity searches on distributed indexes such as with MongoDB and App Engine Datastore. It also has a load of other excellent features for dealing with spheres. I am yet to find a better system for mapping spheres to 1D indexes. The tests are quite extensive and reflect those in the original S2 Geometry Library.
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            kandi-support Support

              sphere has a low active ecosystem.
              It has 59 star(s) with 18 fork(s). There are 8 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 1 open issues and 0 have been closed. On average issues are closed in 1545 days. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of sphere is current.

            kandi-Quality Quality

              sphere has 4 bugs (0 blocker, 0 critical, 4 major, 0 minor) and 41 code smells.

            kandi-Security Security

              sphere has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              sphere code analysis shows 0 unresolved vulnerabilities.
              There are 9 security hotspots that need review.

            kandi-License License

              sphere is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              sphere releases are not available. You will need to build from source code and install.
              sphere has no build file. You will be need to create the build yourself to build the component from source.
              sphere saves you 1707 person hours of effort in developing the same functionality from scratch.
              It has 3783 lines of code, 392 functions and 2 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed sphere and discovered the below as its top functions. This is intended to give you an instant insight into sphere implemented functionality, and help decide if they suit your requirements.
            • Returns the bounding box bounding box
            • Convert face u v to coordinates
            • Calculate the latitude from a point
            • Constructor from a point pair
            • Returns the bounding box of the bounding box
            • Distance between two numbers
            • Return the angle in radians
            • Returns the Cap bounding box
            • Adds a point to the axis
            • Return True if other are equal
            • Return the intersection of two cells
            • Convert to a point
            • Return True if other is equal to self
            • Returns True if two intersects intersects
            • Checks if the point is contained in other
            • Create a bounding box from two points
            • Return True if self is equal to self
            • Return True if other intersects the other
            • Check if other intersects
            • Get the difference between two cells
            • Return the union of two sets
            • Returns True if other contains the other
            • Return the intersection of two sets
            • Expand the vector
            • Return a new instance with the expanded range expanded
            • Computes the CCW
            Get all kandi verified functions for this library.

            sphere Key Features

            No Key Features are available at this moment for sphere.

            sphere Examples and Code Snippets

            No Code Snippets are available at this moment for sphere.

            Community Discussions

            QUESTION

            Cannot dispose of unwanted geometry in three.js application
            Asked 2021-Jun-15 at 10:37

            In this minimal example, I'm adding a THREE.SphereGeometry to a THREE.Group and then adding the group to the scene. Once I've rendered the scene, I want to remove the group from the scene & dispose of the geometry.

            ...

            ANSWER

            Answered 2021-Jun-15 at 10:37

            Ideally, your cleanup should look like this:

            Source https://stackoverflow.com/questions/67976490

            QUESTION

            How to save a VTK render as a .vtk or .stl?
            Asked 2021-Jun-14 at 14:42

            I have created a render of a 3D network initially created in Networkx, however now that I have this render I would ultimately like to export it as a single .stl file. From the code below, how would I be able to combine the glyph, tubes, ball into one file. If it is not possible to export to .stl, .vtk would be fine too as it could be converted in Paraview.

            ...

            ANSWER

            Answered 2021-Jun-14 at 14:42

            VTK has Exporter classes that you can see here: https://vtk.org/doc/nightly/html/classvtkExporter.html

            Of those, I'd say OBJ is the closest to STL. You could export your scene to OBJ and then use MeshLab to convert that OBJ to STL. VRML would work too.

            Source https://stackoverflow.com/questions/67963814

            QUESTION

            Visualizing networkx graph in VTK but nothing is rendering?
            Asked 2021-Jun-13 at 23:39

            I receive no errors when trying to run this code, however nothing is rendered and only a blank screen appears. Please let me know where I have gone wrong. node_pos is a dictionary with all node coordinates keyed to node number, and G is the networkx graph object G. This code is adapted from code found elsewhere from 2005, so had to update some VTK attributes as they were outdated.

            def draw_nxvtk(G, node_pos):

            ...

            ANSWER

            Answered 2021-Jun-13 at 23:39

            QUESTION

            How to create Undo/Redo operations in Qt3D?
            Asked 2021-Jun-13 at 22:49

            I created some entities using qt3d in QML. For example, this code shows a Scene3D element that declares RootEntity which is another QML element that contains the scene graph:

            ...

            ANSWER

            Answered 2021-Jun-13 at 17:22

            One approach is to maintain a global list of Qt.vector3d elements and use it to record the position of the spheres that are removed with the "Undo" operation:

            • When the user hits CTRL+Z, create a new Qt.vector3d object to store the position of the last sphere rendered (that is, the one that was last appended to entityModel) and add that position to the global list of 3d vectors;
            • Then, to remove a sphere from the screen, call entityModel.remove() with the index of the sphere that needs to be erased;

            The "Redo" operation simply does the opposite:

            • When the user hits CTRL+Y, the last element of the global list of 3d vectors holds the location of the lastest sphere removed: append this position to entityModel so the sphere can be rendered again;
            • Then, remember to erase this position from the global list so the next Undo operation can render a different sphere;

            RootEntity.qml:

            Source https://stackoverflow.com/questions/67956066

            QUESTION

            OpenGL (LWJGL 3) culling terrain vertices/triangles that are not in the view frustum
            Asked 2021-Jun-13 at 19:55

            I am trying to implement frustum culling in my 3D Game currently and it has worked efficiently with the entities because they have a bounding box (AABB) and its easier to check a box against the frustum. On saying that, how would I cull the terrain? (it physically cannot have a AABB or sphere)

            The frustum class (I use the inbuilt JOML one):

            ...

            ANSWER

            Answered 2021-Jun-13 at 19:55

            One way to determine what section of your terrain should be culled is to use a quadtree (for a heightmap) or an octree (for a voxel map). Basically, you divide your terrain into little chunks that then get divided further accordingly. You can then test if these chunks are in your viewing frustum and cull them if necessary. This technique was already discussed in great detail:

            I saw some websites saying to use GL_DYNAMIC_DRAW instead of GL_STATIC_DRAW, but I did not understand it.

            These are usage hints to OpenGL on how the data will be accessed so the implementation has the ability to apply certain optimizations on how to store/use it.

            usage is a hint to the GL implementation as to how a buffer object's data store will be accessed. This enables the GL implementation to make more intelligent decisions that may significantly impact buffer object performance. (https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glBufferData.xhtml)

            Please note that these are only indications, no restrictions:

            It does not, however, constrain the actual usage of the data store.

            Because you will likely update your VBO's and IBO's constantly (see culling) and only want to draw them GL_DYNAMIC_DRAW would be a good choice:

            The data store contents will be modified repeatedly (because of culling) and used many times. The data store contents are modified by the application and used as the source for GL drawing and image specification commands.

            as I have googled that it can affect the performance of the game

            Well, it will cost some performance to cull your terrain but in the end, it will likely gain performance because many vertices (triangles) can be discarded. This performance gain may grow with larger terrains.

            Source https://stackoverflow.com/questions/67958723

            QUESTION

            threebox "projectToWorld" returns values exceeding canvas, how do I fix this? (with sample code)
            Asked 2021-Jun-12 at 22:39

            I recently found out there is a very handy method in three-box for placing three.js objects on the map which is "projectToworld".

            While trying to place my three.js objects using the method, I realized that the Vector3 the method returns are really huge and not on the map.

            According to the documentation of threebox, it says

            projectToWorld

            tb.projectToWorld(lnglat) : THREE.Vector3

            Calculate the corresponding THREE.Vector3 for a given lnglat. It's inverse method is tb.unprojectFromWorld.

            So I decided to use this method to locate my animated object in three js canvas. But what the methods returns are really huge.

            So as I expected, these values don't place the three objects on the map and all the objects disappeared because they presumably are placed at very distant locations.

            How do I fix this issue?

            I made a minimal code to demonstrate this issue as below.

            1. instantiating map
            ...

            ANSWER

            Answered 2021-Jun-12 at 22:39

            It's strange that no one could answer this question. So I finally figured out how to make it by myself.

            The solution is in the following link.

            The primary reason was that mapbox plots things not based on its vector configuration. It renders things through its matrix as follows.

            var m = new THREE.Matrix4().fromArray(matrix); var l = new THREE.Matrix4().makeTranslation(modelTransform.translateX, modelTransform.translateY, modelTransform.translateZ) .scale(new THREE.Vector3(modelTransform.scale, -modelTransform.scale, modelTransform.scale))

            Source https://stackoverflow.com/questions/67864751

            QUESTION

            Pi estimation using sphere volume
            Asked 2021-Jun-12 at 14:46

            My task is to calculate the approximate value of pi with an accuracy of at least 10^-6. The Monte Carlo algorithm does not provide the required accuracy. I need to use the calculation only through the volume of the sphere. What do you advise? I would be glad to see examples of code in CUDA or pure C++. Thank you.

            ...

            ANSWER

            Answered 2021-Jun-12 at 12:32

            Taylor Series can be used to calculate the value of pi accurate up to 5 decimal places.

            Source https://stackoverflow.com/questions/67948799

            QUESTION

            GLUT: How to Make Sphere with radius greater than 1?
            Asked 2021-Jun-12 at 14:38

            I am trying to make a solar system using OpenGL for project. As I have other planets and moons too, I want to make my sun larger than radius=1, and my earth=1 since a little less than 0.18, the sphere is barely visible, and moons cannot be drawn with proper size difference.

            Below is my code, if I try to make a sphere with radius > 1, it becomes donut (torus) like. Can anyone guide me on how to make spheres using gluSphere of radius > 1?

            ...

            ANSWER

            Answered 2021-Jun-12 at 14:38

            The sphere is clipped by the near and far plane of the viewing volume (Orthographic projection). Use glOrtho instead of gluOrtho2D and increase the distance to the near and far plane:

            gluOrtho2D(-5.0, 5.0, -5.0, 5.0);

            Source https://stackoverflow.com/questions/67949724

            QUESTION

            swift SceneKit decline node move
            Asked 2021-Jun-10 at 14:05

            I create a sphere node, I need the user to be able only to rotate (left / right, up / down) and zoom in / out the node, but default he can move the node from the center (with two fingers) - is possible prohibit the user to move the node from the center? thanks for any help

            ...

            ANSWER

            Answered 2021-Jun-08 at 18:38

            Yes, all of that is doable. First, create your own camera class and turn off allowsCameraControl. Then you can implement zoom/strafe/whatever.

            Here are some examples that may help, just search for these numbers in the stack search bar and find my answers/examples.

            57018359 - this post one tells you how to touch a 2d screen (tap) and translate it to 3d coordinates with you deciding the depth (z), like if you wanted to tap the screen and place an object in 3d space.

            57003908 - this post tells you how to select an object with a hitTest (tap). For example, if you showed the front of a house with a door and tap it, then the function would return your door node provided you name the node "door" and took some kind of action when it's touched. Then you could reposition your camera based on that position. You'll want to go iterate through all results because there might be overlapping or plus Z nodes

            55129224 - this post gives you quick example of creating a camera class. You can use this to reposition your camera or move it forward and back, etc.

            Two finger drag:

            Source https://stackoverflow.com/questions/67888025

            QUESTION

            Optimize c++ Monte Carlo simulation with long dynamic arrays
            Asked 2021-Jun-10 at 13:17

            This is my first post here and I am not that experienced, so please excuse my ignorance.

            I am building a Monte Carlo simulation in C++ for my PhD and I need help in optimizing its computational time and performance. I have a 3d cube repeated in each coordinate as a simulation volume and inside every cube magnetic particles are generated in clusters. Then, in the central cube a loop of protons are created and move and at each step calculate the total magnetic field from all the particles (among other things) that they feel.

            At this moment I define everything inside the main function and because I need the position of the particles for my calculations (I calculate the distance between the particles during their placement and also during the proton movement), I store them in dynamic arrays. I haven't used any class or function,yet. This makes my simulations really slow because I have to use eventually millions of particles and thousands of protons. Even with hundreds it needs days. Also I use a lot of for and while loops and reading/writing to .dat files.

            I really need your help. I have spent weeks trying to optimize my code and my project is behind schedule. Do you have any suggestion? I need the arrays to store the position of the particles .Do you think classes or functions would be more efficient? Any advice in general is helpful. Sorry if that was too long but I am desperate...

            Ok, I edited my original post and I share my full script. I hope this will give you some insight regarding my simulation. Thank you.

            Additionally I add the two input files

            parametersDiffusion_spher_shel.txt

            parametersIONP_spher_shel.txt

            ...

            ANSWER

            Answered 2021-Jun-10 at 13:17

            I talked the problem in more steps, first thing I made the run reproducible:

            Source https://stackoverflow.com/questions/67905839

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install sphere

            You can download it from GitHub.
            You can use sphere like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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