kandi X-RAY | opentk Summary
kandi X-RAY | opentk Summary
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Trending Discussions on opentk
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:...
ANSWERAnswered 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
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...
ANSWERAnswered 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);
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
ANSWERAnswered 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):
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
NativeWIndow without any Graphical Object.
I expected the code to draw a cube inside the
ANSWERAnswered 2021-Dec-11 at 10:47
You must implement the
OnUpdateFrame event callback. You also need to call
Context.SwapBuffers(); to update the display:
I am trying to read the depth buffer and store it into an array using openTK in C#.
This is my code so far:...
ANSWERAnswered 2021-Nov-09 at 07:11
I have solved it meanwhile. I was pretty close with my code. The correct code goes like this:
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
ANSWERAnswered 2021-Sep-21 at 09:45
I found the error, I was targeting the vertexshader object when compiling both shaders
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.
ANSWERAnswered 2021-Sep-15 at 10:09
This 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".
Edit: Please make sure that you uninstall the official GstSharp package if you are using the hotfix package.
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....
ANSWERAnswered 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.
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:...
ANSWERAnswered 2021-Jun-20 at 11:42
There are 2 issues:
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
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:...
ANSWERAnswered 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
and the name stack is not correct (always 1).
It is not allowed to call
GL.LoadName within a
GL.End sequence. This causes an invalide operation error (
GL.GetError). You need to draw 2 separate quads.
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