opentk | Open Toolkit library is a fast , low-level C | Game Engine library

 by   opentk C# Version: 4.7.7 License: Non-SPDX

kandi X-RAY | opentk Summary

kandi X-RAY | opentk Summary

opentk is a C# library typically used in Institutions, Learning, Education, Gaming, Game Engine, WebGL applications. opentk has no bugs, it has no vulnerabilities and it has medium support. However opentk has a Non-SPDX License. You can download it from GitHub.

OpenTK is a large project. There are many components to work on, and we’d welcome almost any contribution. The community is friendly, welcoming and always ready to help you get your PRs merged!.

            kandi-support Support

              opentk has a medium active ecosystem.
              It has 2817 star(s) with 623 fork(s). There are 153 watchers for this library.
              It had no major release in the last 12 months.
              There are 43 open issues and 707 have been closed. On average issues are closed in 100 days. There are 18 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of opentk is 4.7.7

            kandi-Quality Quality

              opentk has 0 bugs and 0 code smells.

            kandi-Security Security

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

            kandi-License License

              opentk has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              opentk releases are available to install and integrate.
              Installation instructions are not available. Examples and code snippets are available.
              It has 256866 lines of code, 0 functions and 1399 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

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            Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of opentk
            Get all kandi verified functions for this library.

            opentk Key Features

            No Key Features are available at this moment for opentk.

            opentk Examples and Code Snippets

            No Code Snippets are available at this moment for opentk.

            Community Discussions


            OpenTK doesn't render the color of my triangle
            Asked 2022-Apr-03 at 07:08

            I am learning to program a game engine which is why I followed a tutorial, with that tutorial I have gotten this far and even though my code is identical to theirs (theirs did work in the videos) its not working the way it is meant to. The triangle stays black no matter what. There is not any errors.

            Main Program Script:



            Answered 2022-Apr-03 at 07:08

            You actually assign the shader program to a local variable in the event callback function's scope. You need to assign it to the variable in scope of Main:



            OpenTK triangle not drawing
            Asked 2022-Mar-20 at 13:30

            I have been following a tutorial but the triangle doesn't show up for me and I have no idea what is wrong with my code for the triangle not to be appearing.

            I am using OpenTK version 4.7.1

            Here is my code:

            This is Window.cs Here is where I write OpenGl code



            Answered 2022-Mar-20 at 12:42

            The last argument of DrawArrays is not the number of primitives but the number of vertices:

            GL.DrawArrays(PrimitiveType.Triangles, 0, 1);



            How to color the face of a cube object drawn with Opentk
            Asked 2021-Dec-16 at 18:27

            I am trying to color the faces of a cube object I have drawn here with opentk. I have registered a method that lets me listen on keyboard key presses to color a face with a specified color. Currently the cube object is drawn with a white color that it is impossible to know the shape of the cube against a black window background. I have checked the official documentation of opengl and they suggest that in order to color a face of a cube, you need to invoke the function gl.color3(float red, float green, float blue) on the instance. The code that to draw the object is here, is it possible to color the face of the object when a keyboard key is pressed. Here is my code



            Answered 2021-Dec-11 at 19:55

            You must specify the color before drawing the quad. Define a color for each of the 6 sides. (This colors are just examples):



            Which method inside GameWindow do we override to draw an object with OpenTk?
            Asked 2021-Dec-11 at 10:47


            I am doing a video game environment design research and I happened to start with the basics of OpenGL with OpenTk-The C# variant of OpenGL. I got code to draw a cube object in my GameWindow with OpenTk from this site. I override the method OnLoad for my GameWindow object and I call the method to draw the cube but nothing happens, the code draws the GameWindow and NativeWIndow without any Graphical Object.


            I expected the code to draw a cube inside the GameWindow Object.

            Code Applied



            Answered 2021-Dec-11 at 10:47

            You must implement the OnUpdateFrame event callback. You also need to call Context.SwapBuffers(); to update the display:



            OpenTK read depth buffer to array
            Asked 2021-Nov-09 at 07:11

            I am trying to read the depth buffer and store it into an array using openTK in C#.

            This is my code so far:



            Answered 2021-Nov-09 at 07:11

            I have solved it meanwhile. I was pretty close with my code. The correct code goes like this:



            OpenTK black triangle?
            Asked 2021-Sep-21 at 10:19

            Before refering to it, I have read OpenTK - fragment shader is not working (triangle is always black) and it did not help.

            I'm trying to do the 'hello triangle' tutorial, for OpenTK in F#. But my triangle is black instead of orange. I guess that it is somehow the fragment shader that is not working correctly but can't find out why.

            Shader class



            Answered 2021-Sep-21 at 09:45

            I found the error, I was targeting the vertexshader object when compiling both shaders



            C# Gstreamer-d3d11-overlay Sink.Emit pointer error on render
            Asked 2021-Sep-15 at 10:09

            I'm developing a C# WPF application using gstreamer-sharp-netcore(Mingw v1.19.1) on Windows. What we would like to achieve is to be able to render video with hardware acceleration. To avoid the airspace issue in WPF, we are using gstreamer-d3d11-overlay(

            From the sample, there are 2 ways to initiate rendering the video(MainWindow.cs):

            1. Show video by giving the MainWindow handle to GStreamer. This will result in video taking over the whole the WPF. This piece of code works, but we won't be able to add any WPF controls.


            Answered 2021-Sep-15 at 10:09

            This issue was fixed in GtkSharp:

            I assume that you are using GstSharp NuGet package which per today has not been updated with this fix yet.

            To temporarily solve the issue, I have uploaded a unofficial hot fix to NuGet, search for "GstSharp.HotFix".


            Edit: Please make sure that you uninstall the official GstSharp package if you are using the hotfix package.



            OpenTK UV issue
            Asked 2021-Jun-21 at 09:57

            So, I have been using OpenTK and was able to make it load an obj file but I have a problem. whenever I try to load a texture the UVs are all messed up, while In blender everything is fine. I used AssimpNet to load in the model.

            Here is a screenshot of a Hat with its texture applied.

            A sample from the Loader script, it clearly stores the Uvs.



            Answered 2021-Jun-21 at 09:57

            I fixed it, I have found out that in the load.cs script it added the UV's incorrectly! the second UV coord had to be negated, as from what I was told blender does the UV coords a bit different than OpenGL.



            How to get the correct name stack in OpenTK for a 3D cube?
            Asked 2021-Jun-20 at 11:42

            I am trying to draw a 3D cube (6-faces) in OpenTK, and select the desired face using right button click. I am using a select function, and assign the names for each face (i.e 1-6). However, when I run my code, I cannot get the correct name stack, even though I right click on other face. I just get the same name stack (5).

            I am not sure what is wrong with the select function/ the GluPickMatrix.

            Do you have any idea why I cannot get the correct name stack in this case? How to get the correct name stack?

            Here is my code:



            Answered 2021-Jun-20 at 11:42

            There are 2 issues:

            • GL.LoadMatrix loads an matrix and overwrites the existing matrix. If you want to concatenate a matrix with the current matrix, you need to use GL.MultMatrix

            • It is not sufficient to set the projection matrix. You also have to set the model view matrix. Since the model view matrix is set, it is sufficient to remove GL.LoadIdentity after GL.MatrixMode(MatrixMode.Modelview).



            Cannot get the correct name stack in OpenTK
            Asked 2021-Jun-18 at 11:38

            I am referring to LWJGL tutorial here ( for the picking. The source code for this tutorial can be found here (

            Basically what I want to do here is to translate this Java code into C# code using OpenTK. In this code, there are 2 objects (rectangles) being rendered to screen. Then I want to get the correct name stack when I click on the object. However, when I run my code, I only get the same name of 1, even though I click on other object. Also, when I click on the object, the screen get zoom in, which is not I want.

            I am not sure what is wrong in my code. What I suspect the wrong part is the GluPickMatrix function. Here is my code:



            Answered 2021-Jun-18 at 11:38

            the screen zoom in (not what I want),

            This is because you've changed the matrix mode in the select method. Choose the MatrixMode.Projection, before GL.PopMatrix():

            and the name stack is not correct (always 1).

            It is not allowed to call GL.LoadName within a GL.Begin/GL.End sequence. This causes an invalide operation error (GL.GetError). You need to draw 2 separate quads.


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


            No vulnerabilities reported

            Install opentk

            You can download it from GitHub.


            API Documentation is available on the [official website]( or inline from favourite IDE. You can also browse the full API on the official website. Additional information can be found in the [OpenTK Manual]( Technical documentation about the implementation of OpenTK can be found in the [Technical Wiki](
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