ogl | ⤴️

I have been trying to solve this silly bubble sorting program i received in my high school, I attempted to make a autosorting class(See the code) just for the fun of it, But then, Something is troubling me

I'm trying to run this example (https://github.com/xinwucwp/mhe) on netbeans 8.2 + jython module (ver. 2.7.2). I created a new jython project and added a start.py file with code from demo2.py (from example), here the full file - https://pastebin.com/DqBrDmnN.

As i understand, i have to add path to java classes - *.jar files.

After that, i tried to run it and got the following error - from edu.mines.jtk.ogl.Gl import * java.lang.NoClassDefFoundError: com/jogamp/opengl/GLArrayData, although i've already added jogl-all.jar, which includes GLArrayData.class.

I'm having access violation on every gl call after this texture initialization (actually the last GLCALL(glBindTexture(m_Target, bound)); is also causing access violation so the code at the top is what probably causing it):

I am trying to detect the full word the user is tapping when they focus in on an HTML input element, and then see if it is a URL. I am using the following method:

I'm trying to make a simple mouse look with standard arrow key movement, and I've got the mouselook working but the translations from the rotated points seem to move along an orthogonal basis, but not one that is aligned with the rotation of the mouselook. I can't tell if my math is off or if opengl is doing something extra to transform the points and I need to adjust. I looked at the modelview matrix and it appears to be following the same order of rotations but I'm just stuck here, I'm not sure if it has something to do with the perspective or what is happening really. I'm not the best with linear algebra so it's got me stuck a bit.

I have been working my way through the OpenGL-tutorial.org tutorial series. All has been working fine, however I have not been able to get Tutorial 5 to work in my playground executable, though it does work when run from the example tutorial 5 executable. This is true even when I copy and paste the example code over.

I receive the following errors:

The below code is a sample.

I am trying to create the Flowmap effect from OGL examples but with partially transparent PNG image. I was struggling with this issue for many hours now and I don't even know whether it is the texture's fault the flowmap effect or any other thing. How can I set the background transparent instead of black?

The way rendered canvas looks

I'm working on porting from OpenGL (OGL) to MetalKit (MTK) on iOS. I'm failing to get identical display in the MetalKit version of the app. I modified the projection matrix to account for differences in Normalized Device Coordinates between the two frameworks, but don't know what else to change to get identical display. Any ideas what else needs to be changed to port from OpenGL to MetalKit?

I understand that the Normalized Device Coordinates (NDC) are different in OGL vs MTK:

• OGL NDC: -1 < z < 1
• MTK NDC: 0 < z < 1

I modified the projection matrix to address the NDC difference, as indicated here. Unfortunately, this modification to the projection matrix doesn't result in identical display to the old OGL code.

I'm struggling to even know what else to try.

For reference, here's some misc background information:

• The view matrix is very simple (identity matrix); i.e. camera is at (0, 0, 0) and looking toward (0, 0, -1)
• In the legacy OpenGL code, I used GLKMatrix4MakeFrustum to produce the projection matrix, using the screen bounds for left, right, top, bottom, and near=1, far=1000

I stripped the scene down to bare bones while debugging and below are 2 images, the first from legacy OGL code and the second from MTK, both just showing the "ground" plane with a debug texture and a black background.

Any ideas about what else might need to change to get to identical display in MetalKit would be greatly appreciated.

I tried to extract code relevant to calculation and use of the projection matrix: