opentk | Open Toolkit library is a fast , low-level C | Game Engine library
kandi X-RAY | opentk Summary
kandi X-RAY | opentk Summary
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Trending Discussions on opentk
QUESTION
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:
...ANSWER
Answered 2022-Apr-03 at 07:08You 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
:
QUESTION
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
...ANSWER
Answered 2022-Mar-20 at 12:42The last argument of DrawArrays
is not the number of primitives but the number of vertices:
GL.DrawArrays(PrimitiveType.Triangles, 0, 1);
QUESTION
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
ANSWER
Answered 2021-Dec-11 at 19:55You must specify the color before drawing the quad. Define a color for each of the 6 sides. (This colors are just examples):
QUESTION
Problem
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.
Expectations
I expected the code to draw a cube inside the GameWindow
Object.
Code Applied
...ANSWER
Answered 2021-Dec-11 at 10:47You must implement the OnUpdateFrame
event callback. You also need to call Context.SwapBuffers();
to update the display:
QUESTION
I am trying to read the depth buffer and store it into an array using openTK in C#.
This is my code so far:
...ANSWER
Answered 2021-Nov-09 at 07:11I have solved it meanwhile. I was pretty close with my code. The correct code goes like this:
QUESTION
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. https://opentk.net/learn/chapter1/2-hello-triangle.html
Shader class
...ANSWER
Answered 2021-Sep-21 at 09:45I found the error, I was targeting the vertexshader object when compiling both shaders
QUESTION
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(https://github.com/berglie/gstreamer-d3d11-overlay/).
From the sample, there are 2 ways to initiate rendering the video(MainWindow.cs):
- 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.
ANSWER
Answered 2021-Sep-15 at 10:09This issue was fixed in GtkSharp: https://github.com/GLibSharp/GtkSharp/pull/52
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".
https://www.nuget.org/packages/GstSharp.Hotfix/
Edit: Please make sure that you uninstall the official GstSharp package if you are using the hotfix package.
QUESTION
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.
...ANSWER
Answered 2021-Jun-21 at 09:57I 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.
QUESTION
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:
...ANSWER
Answered 2021-Jun-20 at 11:42There 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 useGL.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
afterGL.MatrixMode(MatrixMode.Modelview)
.
QUESTION
I am referring to LWJGL tutorial here (https://www.youtube.com/watch?v=V9e7A4konHo) for the picking. The source code for this tutorial can be found here (https://docs.google.com/document/d/1MEcdkcCCM-BKmuL2Rg5SR-_RG6cCH7Ek9_hU7xXlW4Y/pub).
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:
...ANSWER
Answered 2021-Jun-18 at 11:38the 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.
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