OpenTK is a C# library that wraps OpenGL, OpenCL and OpenAL.
1
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1answer
43 views
OpenGL - Buffer Usage
I am currently working on a little OpenGL project.
At the moment I am trying to find a good solution for rendering multiple objects.
I have set up a terrain with its own buffers, which works just ...
1
vote
1answer
151 views
Understanding implementation of glu.PickMatrix()
I am working on an OpenGL project which requires object selection feature. I use OpenTK framework to do this; however OpenTK doesn't support glu.PickMatrix() method to define the picking region. I ...
0
votes
1answer
130 views
OpenGL UseProgram() fails
I have a rather strange exception on my application using OpenTK on Linux (ArchLinux with Mono 3.2.8) with GL.UseProgram(). I wrote a class to combine multiple files to one program:
public sealed ...
0
votes
1answer
81 views
How to create a regular grid of triangles correctly?
I am trying to create an terrain using opentk/opengl.
I have a problem with the VBO/IBO.
I think a picture of the problem is the best way to show it:
I dont understand why the last triangle of a ...
0
votes
1answer
313 views
Using Shader causes triangle to disappear
The following is my rendering code.
Private Sub GameRender()
GL.Clear(ClearBufferMask.ColorBufferBit + ClearBufferMask.DepthBufferBit)
GL.ClearColor(Color.SkyBlue)
...
7
votes
1answer
173 views
How do I reconfigure my GLES frame buffer after a rotation?
Note: In order to keep the question as simple as possible, I am actively changing the body of the question to reflect the current state of affairs, instead of adding stuff at the bottom.
I am ...
-1
votes
2answers
95 views
How to translate along Z axis in OpenTK
I am playing around with an OpenGL sample application I downloaded for Xamarin-Android. The sample application produces a rotating colored cube I would simply like to edit it so that the rotating cube ...
1
vote
1answer
129 views
OpenGL - Calculating camera view matrix
Problem
I am calculating the model, view and projection matrices independently to be used in my shader as follows:
gl_Position = projection * view * model * vec4(in_Position, 1.0);
When I try to ...
1
vote
1answer
78 views
Why are my objects rotating with my camera?
I am working with this C# library that wraps OpenGL. I am trying to understand why my objects in the scene are rotating as I yaw my camera (view matrix).
Here is an image where I have 4 separate ...
4
votes
1answer
73 views
OpenGL - What steps to take to correctly set up an Uniform Block Array
I have managed to get uniform blocks to work, but I seem to make something wrong when trying to setup an array of uniform blocks.
Assume this glsl:
layout(std140, binding=1) uniform LightingBlock
...
4
votes
1answer
201 views
OpenGL rendering looks squeezed
I am rendering bunch of cubes of unit size, but for some reason they look like they are squeezed a bit in the screen-space y axis. Why is this?
My projection matrix:
Projection = ...
0
votes
1answer
92 views
How do I prevent clicking at the end of each sound play in OpenAL?
I have put together a basic sound handler class for use in my game. It uses OpenAL.
It's a simple method at the moment to play sounds - here's an extract from a switch block:
case "EATEN_PILL":
...
0
votes
3answers
1k views
How can I convert screen coordinatess to world coordinates in OpenTK?
I'm making a windows forms application with opengl view. I need to get the mouse coords converted to the opengl world coords. Well, my Y coord gets converted wrong. It's hard to explain, so here is ...
2
votes
0answers
207 views
OpenGL drawing 500k triangles [closed]
I want to render big, izometric 2d map (using ortho projection). I am using OpenTK and aiming for OpenGL 3.3. Perfect option would be to draw 512x512 map of tiles, which is 262144 blocks -> 524288 ...
1
vote
1answer
218 views
GLSL - std140 uniform block - fields(vec, float, mat4) always 0.0
Ok,
First of all, if just use uniforms everthing works like it should. Switching to uniform blocks nothing goes, as all values look like 0.0. I tested this with various if-then-else stuff within the ...
2
votes
3answers
2k views
Is OpenTK Dead?
Looking at OpenTK, I notice some disturbing signs:
The last news item was posted on December 31st, 2010
The main forum gets about one post a day
On SourceForge, the last nightly build was in March, ...
2
votes
1answer
151 views
How do I animate pieces between puzzle states?
I'm developing a simple C# puzzle game as a learning exercise, using OpenTK. It's similar to Puzzles and Dragons' puzzle part: The aim is to match 3 pieces to remove them. Removed pieces are replaced.
...
0
votes
0answers
302 views
Use opentk window handle to host wpf control - Monogame
well my boss asked me to try and get wpf controls rendered in Monogame.
From what I understand this was easly doable in Xna, however in monogame it fails.
Is there any way to make the window hadle ...
1
vote
1answer
343 views
Does OpenTK work in Windows 8?
While looking up OpenTK, I found a couple of references to threads that talk about Windows 8 support:
This one from 2011 claims that OpenTK works on a Win8 preview
A newer one from 2012 leaves the ...
1
vote
2answers
210 views
Why swapping buffers takes different amounts of time?
When my program starts, almost nothing is on screen, just couple of lights and spheres. My FPS is at ~50. The Speed measurements looks like this:
UpdateFrame took 0 ms
Clearing lights queue: 0 ms
...
2
votes
1answer
210 views
Incorrect lighting results with deferred rendering
I am trying to render a light-pass to a texture which I will later apply on the scene. But I seem to calculate the light position wrong. I am working on view-space.
In the image above, I am ...
0
votes
0answers
212 views
OpenTK (OpenGL) Rotation around fixed axes?
How would I go about rotating things in 3-dimensional space along fixed axes? As OpenTK only seems to have rotation that modifies the other rotation, as in
X affects Y & Z
Y affects Z
Z affects ...
0
votes
2answers
398 views
Translate extrinsic rotations to intrinsic rotations ( Euler angles )
The problem I have is very frustrating:
I am using the Jitter Physics library which gives Quaternion rotations, you can extract the extrinsic rotations but I need intrinsic rotations to rotate in ...
1
vote
2answers
677 views
Drawing multiple objects from one Vertex Buffer Object in OpenGL/OpenTK
I am trying to experimenting drawing method using VBO in OpenGL. Many people normally use 1 vbo to store one object data array. I was trying to do something quite opposite which is storing multiple ...
1
vote
1answer
311 views
Input in OpenTK
How to use Input in OpenTK 1.0? There is not much info around, some classes are unfinished.
What I want to achieve, is to be able to use input not only in OnUpdate function, but also in other classes ...
0
votes
0answers
15 views
Grab mouse input in OpenTK? [duplicate]
I've searched a lot on the Internet but I can't seem to find any code that works with the current OpenTK, that "grabs" the mouse input (just gives the delta-x and delta-y, for camera rotation for ...
0
votes
0answers
164 views
Play streaming sound in OpenTK?
What's the simplest way to make a sound stream from disk and play in OpenTK?
0
votes
1answer
752 views
Draw quad with OpenGL VBO using OpenTK
I'm trying to learn how to use VBO (Vertex Buffer Objects) by putting together a simple program that draws a quad to the screen using OpenTK (C# OpenGL bindings).
Unfortunately I'm not seeing ...
4
votes
1answer
205 views
Upload vertex data for particles
I am kind of beginner with opengl.
I am using point sprites (currently without any texturing) for my particles. I seem to fail to get them uploaded to the GPU memory correctly. I have readed lots of ...
0
votes
2answers
915 views
OpenTK 2D Engine [closed]
I'm looking for a 2D gaming engine for C#/Windows. OpenTK seems reasonable, albeit made for 3D. I didn't find anything (other than an old thread from 2008) that talks about a 2D game engine.
Are ...
0
votes
1answer
75 views
Normals not rotated correctly
While rendering a cube to the gbuffer (diffuse, normal, depth) I noticed something odd when applying rotations. I build a world matrix for the cube as follows:
Yaw = Yaw % MathUtil.PI2;
Pitch = Pitch ...
13
votes
3answers
5k views
How do I implement a quaternion based camera?
UPDATE The error here was a pretty simple one. I have missed a radian to degrees conversion. No need to read the whole thing if you have some other problem.
I looked at several tutorials about this ...
4
votes
1answer
107 views
What OpenCL video cards (or FPGAs) features are needed for high speed multiplication?
I'm benchmarking some cryptographic related software and am looking for video cards that are better at parallel multiplication vs parallel addition.
Is there any prior work that would graph video ...
-1
votes
1answer
516 views
Problem rendering VBO [closed]
I'm developing a game engine using OpenTK. I'm trying to get to grips with the use of VBO's. I've run into some trouble because somehow it doesn't render correctly.
Thus far I've used immediate mode ...
1
vote
2answers
164 views
Point[] and Tri not “could not be found”
Hi I'm trying to learn how to load a .obj file using OpenTK in windows Forms. I have seen a lot of examples out there, but I do see almost everyone uses List, and Point[]. Code example show these ...
1
vote
2answers
337 views
I enabled and setup glBlendFunc, but my texture has a white outline. What am I doing wrong?
You can see most of my source code in this question: Instead of the specified Texture, black circles on a green background are getting rendered. Why?
Now I have the problem, that my texture has a ...
3
votes
2answers
199 views
Instead of the specified Texture, black circles on a green background are getting rendered. Why?
I'm trying to render a Texture via OpenGL. But instead of the texture black circles on a green background are rendered. (They scale, depending what the rotation of the texture is)
Example:
The ...
2
votes
1answer
159 views
Why do I have to divide the origin of a quad by 4 instead of 2?
I'm currently transitioning from C#/XNA to C#/OpenTK but I'm getting stuck at the basics.
So I have this Sprite-Class:
public static bool EnableDebugDraw = true;
public float X;
public float Y;
...
0
votes
4answers
430 views
Missing triangles in model
I am having an issue where triangles in a model aren't being shown.
The left is wireframe, the right is the finished image. For some reason a bunch of the triangles aren't being shown.
The project ...
0
votes
2answers
763 views
Can't render to FBO using a shader
I've added functionality so that I can render to a framebuffer (for post-processing and stuff). I can successfully render to my framebuffer and then render that framebuffer, but anything with a ...
1
vote
1answer
210 views
OpenAL seems to ignore sound attentuation/orientation for long sounds
I don't know how else to describe it in the title, sorry.
My sound engine currently works perfectly with listener positioning and sound positioning to create the attentuation and panning effects. At ...
2
votes
3answers
2k views
C# 2D Game Library?
I'm looking for a C# 2D game library based on something like OpenTK which wraps OpenGL for C#
Basically something like Slick2D (2D game library for Java) which is based on LWJGL which is an OpenGL ...
1
vote
1answer
588 views
C# OpenTK - Getting world coordinates of points that are altered by matrices
I have written a skeletal animation system for a game i am working on. To draw lines that represent a skeleton, i use the GL matrix, and multiply it by each bone a long the body. For example before ...
6
votes
2answers
2k views
How do I draw anti-aliased holes in a bitmap
I have an artillery game (hobby-learning project) and when the projectile hits it leaves a hole in the ground. I want this hole to have antialiased edges. I'm using System.Drawing for this. I've tried ...
1
vote
1answer
1k views
Why doesn't my texture display with this GLSL shader?
I am trying to display a DXT1 compressed texture on a quad using a VBO and shaders, but I have been unable to get it working. All I get is a black square.
I know my texture is uploaded properly ...
4
votes
1answer
695 views
In an artillery game how do I mask out the part of the terrain that was hit
Let's say I want to make a really simple artillery game, something like Gorillas. I don't have any experience in games, just some basic understanding of OpenGL. I want to do this for fun and to learn ...
0
votes
2answers
742 views
Using multiple indexes with buffer objects in OpenTK
I've got multiple buffers in OpenGL holding data on position, normals and texcoords.
I also have an equal number of buffers holding distinct index data for each of those buffers.
I quite like this ...
2
votes
2answers
190 views
Collisions between players at spawnpoints
I am working on a FPS/MMORPG and ran into a problem at spawnpoints, when I enabled collision detection between players. Neither player would be able to move if both spawned at the same time, because ...
