Questions tagged [opentk]
OpenTK is a C# library that wraps OpenGL, OpenCL and OpenAL.
102
questions
2
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OpenTK immediate mode on net core doesn't work?
I have some old code that i imported into an OpenTK C# application running on NET 5.0. The rendering uses old fashioned immediate mode and it works on my current computer but nothing renders in the ...
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1
vote
0
answers
34
views
Trouble with Normal Matrix and Point Lighting
I'm having issues with lighting in my game. For some reason, no matter what I try, point lights appear to cut off halfway through the center of the light. I'm trying to render this light on a quad.
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0
votes
1
answer
28
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Corrupt Save File Problem Csharp Opentk
I am trying to save player's objects but my loaded result is corrupt and placed in weird shapes like 3D arrows.
Weirdly enough when terrain is saved, the terrain is fine but objects added later cause ...
- 15
0
votes
0
answers
59
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Why does this order of Quaternion multiplication not introduce roll into my fps-style character controller?
I'm working on an OpenGL based project (in C#), employing Quaternions to rotate my camera I first tried to:
...
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0
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1
answer
130
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C# NanoVG Transparency issue
Hi I'm trying to change from Cairo (2D Vector image library) to NanoVG.
I'm using C#, openTK and Nano.VG.NET to make my game.
I'm having issues with alpha? Transparency/Blending is an issue…
Here ...
- 93
0
votes
1
answer
116
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uniform matrix not being assigned to shader
im trying to apply a rotation matrix to my shader and when i try to set it and mult it in the shader my triangle doesn't render
my drawing code:
...
0
votes
1
answer
917
views
Multiple glControl on same winform is not working - OpenTK C#
I have to show frames from two cameras in two openGl control separately at same time. For that I have put two opengl control in my form and pass those frames to opengl accordingly. But when running ...
- 101
1
vote
1
answer
493
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OpenGL frustum extraction
I'm trying to extract frustum planes from the camera.
The algorithm is simple:
create clip to world space matrix (inversed projection * inversed view)
multiply clip point by clip to world matrix
...
- 108
0
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1
answer
295
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0
votes
0
answers
1k
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Greedy Meshing : Slow to rebuild when updating chunk
I've a problem with my voxel based game. The game is sliced into chunks (Like Minecraft), each chunk is 16x256x16 blocks.
When I started the project, I used a basic culling system when hidden blocks ...
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1
vote
1
answer
249
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OpenGL Texture from Raw Data Not Rendering Correctly
Starting off the class in question is here:
...
- 43
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1
answer
137
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How can I load a texture from VBO?
I already have the .png file in my project, and the .png file has the "Embedded Resource" and "Do not copy" settings.
The game runs fine - nothing throws an error, but the game does not show ...
0
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1
answer
1k
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How do I enable FSAA in OpenTK?
All I could find about it is this question, but GraphicsMode alone doesn't enable anti-aliasing:
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- 101
-1
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3
answers
893
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Multiple rendering back ends architecture
so I've been thinking about designing a rendering engine with multiple back ends in C#.
Well, let me rephrase; I wish to design an engine that can be easily extended upon to support multiple back ...
user102158
0
votes
1
answer
804
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OpenTK Terrain - Triangle strip issue
I'm currently trying to render terrain in an OpenGL application I'm making (using OpenTK in C#). Something really odd is happening and I'm not sure why.
Here is the code I use to load my terrain from ...
user102158
0
votes
1
answer
1k
views
Read from OpenGL texture to Bitmap in C#
I want to read a texture pixels from texture id (associated with some FBO) to bitmap object in opengl (opentk) in c#
But it throws an exception says:
...
- 103
1
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0
answers
430
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OpenTK Camera Rotation issue [duplicate]
I'm currently developing a 3D game engine in C# using OpenTK.
I have basic game objects, and each game object has transform (translation, rotation and scaling). A game object can have components (...
user102158
0
votes
3
answers
361
views
The largest vector in an array
I'm working on a game engine in C# at the moment and I've come across a matter I find confusing. I need to know how to get the maximum three component vector in an array.
There is a method in OpenTK ...
user81509
0
votes
2
answers
116
views
Multiple Indices Problem
Recently, I've been trying to use COLLADA files in OpenGL. The problem that a lot of people before me have run into is COLLADA's ...
user81509
1
vote
1
answer
538
views
OpenGL scissor odd behaviour
I am currently developing a GUI app using OpenGL with OpenTK as interface in C#.
The viewport is set to the entire window space (0,0,width,height) and an ortho transformation is applied like this:
<...
- 21
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votes
1
answer
8k
views
Should I use retained mode or immediate mode
I'm trying to make a opengl wrapper for winforms(.net). Basically you code in gdi+ syntax but it gets rendered for opengl(using glcontrol of opentk).
Which mode should I use for rendering ui? It has ...
- 109
1
vote
1
answer
982
views
Incomplete rendering using OpenTK (VBO)
Using Assimp.net I did load obj file. assimp returns back Mesh object that contains vertexes, normals, faces, colors and texture. when I don't use VBO the object will load complete. like this :
But ...
0
votes
2
answers
832
views
2D HUD over 3D scene
I'm trying to create a 2D Heads up Display for my players in a 3D OpenTK environment. How I'm doing it is by drawing my 3D elements and then running this code.
...
user81509
1
vote
0
answers
91
views
Cube Translation Looks All Wrong
I'm making a very simple cube in OpenTK and it seemed to be going fine until I tried to move it around. Moving it along the X Axis seems to elongate the cube, not the result I hoped for.
My Vertex ...
user81509
1
vote
0
answers
28
views
GL.BlendFuncSeparate(ArbDrawBuffersBlend) Enum has no members?
I want to use the function GL.BlendFuncSeparate but it seems that one of the enums used has no members.
public enum ArbDrawBuffersBlend
{
}
Is ...
- 11
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vote
0
answers
965
views
Rotating an object around it's centre in OpenGL
I'm writing small 3d viewer of models from .obj file.
I have a car and I want to rotate car's wheels. I found a lot of good examples but I still have a problem: wheel rotates around point at the it's ...
4
votes
1
answer
2k
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What's the DSA version of glTexImage2D?
I want to set the initial data of a texture in an OpenGL 4.5 program (using OpenTK.Next and .NET), utilizing the new Direct State Access methods.
However, I cannot find a DSA version of ...
- 561
1
vote
1
answer
159
views
Shader or No Shader?
I have a question about something I don't really understand.
In OpenTK, should I have shaders? Is it frowned upon not to? What are the pros and cons of having shaders?
Can I go perfectly fine without ...
user81509
0
votes
1
answer
223
views
VBO Performance issues
I'm making a 2D Tile based game in OpenTK at the moment. Performance was really bad (laggy and slow) with direct drawing, so I switched to VBOs. The performance hasn't changed, it might even be slower ...
user81509
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votes
2
answers
1k
views
How to use texelFetch
I'm trying to switch from using the GLSL texture() function in my shader to using texelFetch() because I want very little ...
- 269
3
votes
0
answers
549
views
Enabling OpenGL lighting seems to disable blending
I have the following code to set up for some 2D drawing using OpenTK. I originally wrote it without any lighting considerations, but later added the lighting block. This version of the code uses ...
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0
votes
1
answer
178
views
glClearBuffer takes 1 second on a Geforce 9500GT
These 2 lines (in C# using OpenTK) seem to cause 1 second lag every frame on a machine with a Geforce 9500 GT
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- 143
0
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1
answer
554
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Draw wrong faces in obj model with OpenGL VBO
I am trying to draw a 3D model from an .obj file, and have met big trouble.
I think my model draws with wrong faces, but I can't understand why.
Original model:
This is my code for reading the ...
- 13
1
vote
1
answer
408
views
How to apply bindpose for vertex skinning?
I'm creating a model/animation viewer in C# using OpenTK for a game's models. Before stating my problem I want to describe a bit what I've accomplished so far in case I'm fundamentally missing ...
- 204
3
votes
2
answers
951
views
glUniformMatrix4fv OpenTK equivalent
Very simple and quick question which surprisingly I couldn't find an answer to over the internet: what is the equivalent of glUniformMatrixfv for opentk? I've browsed all the 7 overloads of GL....
- 705
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votes
2
answers
640
views
Trying to implement forward rendering in OpenGL
I'm working on implementing forward rendering in my 2D engine, as far as I'm aware everything should be set up correctly, I've ran into some issues earlier but I'm sure I've fixed those at this point.
...
- 59
2
votes
1
answer
11k
views
C# OpenTK Text rendering
I've been looking everywhere for a solution on how to render/draw text for my 2D OpenTK-based game.
Been trying quite a few QuickFont ones without success (either a AccessViolation exception or text ...
2
votes
1
answer
868
views
Opentk hdr rendering with framebuffer white screen problem
I am trying to do hdr rendering with two shader programs: one simply draws a hdr texture on a fullscreen quad and the other one does tonemapping.
I am trying either linear tonemapping
...
- 705
0
votes
2
answers
962
views
Opentk Textured Full Screen Quad
I want to display a texture on a full screen quad. What I get is a completely green quad and after a week of debugging I cannot understand why.
I am currently using OpenTK 1.1.2225 and Magick.NET-Q16-...
- 705
3
votes
1
answer
480
views
Turning On/Off Vsync no longer working when rendering to an offscreen buffer
I have this reaallly strange issue that as soon as I render to an offscreen framebuffer I am no longer able to toggle VSync while my application is running. I am using OpenTK as the opengl wrapper, ...
- 143
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vote
0
answers
1k
views
How to use OpenTK (OpenGL) with MonoGame?
So I've been making a snake game using MonoGame (DirectX Only). I added movement, controls, feeding and growing in length. I wanted to add smooth animations to the game because the snake is just made ...
- 634
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votes
0
answers
172
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GL.Scissor not working as expected
I have some code for rendering a button in an application and I want to clip the text if it's wider than the button itself. Here a bit of code to describe what I'm doing:
...
- 192
2
votes
1
answer
333
views
OpenTK crashes with Mono
I've implemented OpenTK as a secondary renderer which would let me support Mac/Linux only to realize that for some reason, even without any modifications (new MonoGame project), the application would ...
- 41
1
vote
1
answer
933
views
Applying Transformation Matrices to VBOs in OpenGL
So I've recently tried to add Vertex Buffer Object Matrix transformation to an OpenGL engine I'm working on. I could go about this by applying the matrix to a copy of each vertex individually, but ...
- 257
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votes
1
answer
1k
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Dual paraboloid shadows on GLSL
I'm trying to port an XNA example to OpenTK + OpenGL, I found it here http://graphicsrunner.blogspot.com.es/2008/07/dual-paraboloid-shadow-maps.html
But I'm having a really hard time, I think my maps ...
- 259
0
votes
1
answer
3k
views
OpenTK Ray Picking
I just can't get ray picking to work (I need to drop old working faedback mode, and replace it with color pick, but because my scene can have up to 300K+ objects it is reasonable to filter (it's a ...
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1
vote
0
answers
19
views
CanDraw in large hierarchical scene with rotation
I've been assigned to write small simulation visualization, that contains thousands of cubes (I know you heard that before). Now I'm working on optimization of stuff that takes place there, but ...
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2
votes
0
answers
1k
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Cannot convert bitmap to texture [closed]
I'm doing a little C# / OpenGL project and I can't manage to load textures properly.
So here is my texture class :
...
- 46
2
votes
1
answer
3k
views
OpenGL: Draw an arrow
I'd like to know how to draw an arrow to represent a vector position, length and direction.
The issue is that I can't quite find an easy way to know the location and rotation of the triangle ...
1
vote
1
answer
1k
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OpenGL why point's size stay the same while zooming/unzooming
i'm currently working on a game engine for a college's project. While implementing some debug tools I came across a little problem. When i'm drawing point on the ModelView Matrix the point's thickness ...