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$
USD
I will fix opengl glsl shader and cpp qt rendering bugs in your 3d app
Charlie Yang
About this gig
Is your OpenGL app showing a black screen, flickering, wrong colors, broken transparency or a shader that won't compile? I can find and fix it.
I'm an OpenGL engineer with 3 years of professional experience building 3D rendering for dental CAD software (C++, Qt, OpenGL, GLSL, OpenSceneGraph, VTK), plus 1 year as a Windows GPU driver engineer working on DirectX 12/DX9 (WDDM). I understand the graphics pipeline from application code down to the driver, so I can track bugs other developers find hard.
What I can help with:
- OpenGL / GLSL shader bugs (vertex, fragment, geometry)
- Depth, blending, transparency, lighting and normal issues
- Mouse picking, camera and matrix/transform problems
- Qt widgets with QOpenGLWidget / QOpenGLFunctions
- OpenSceneGraph and VTK visualization problems
- Porting legacy OpenGL to modern core profile; performance tuning
How I work:
1. You send the code (or a minimal reproducible project) and a description/screenshots of the problem.
2. I reproduce, fix, and return the changed code with a clear written explanation.
Communication is by text chat only, in English or Chinese. Please message me before ordering so I can confirm scope.
Get to know Charlie Yang
Charlie Yang
Software Engineer, Python Automation, C Plus Plus and OpenGL
- FromChina
- Member sinceOct 2026
Languages
Chinese, English
I'm a software engineer from Chengdu, China with 4 years of professional C++ experience: 3 years building OpenGL/GLSL rendering for dental CAD software and 1 year on Windows GPU drivers (DirectX). On Fiverr I take small, well-defined jobs I can finish fast and carefully: Python scripts that automate PDF, Excel and CSV work, data extraction and cleanup, bug fixes in C++ or Python, and Chinese-English translation. I'm a native Mandarin speaker with fluent English (IELTS 7.5). Clear communication by message, quick first drafts, and revisions until it's right.
FAQ
What do you need from me?
Buildable source code (or a minimal repro), build steps, OS/GPU info, and screenshots of the issue.
Do you work on Vulkan / DirectX / Unity / Unreal?
This gig covers OpenGL/GLSL, Qt, OSG and VTK. Ask me about DirectX before ordering.
What if you can't fix it?
I'll tell you early; if I can't deliver, you can cancel for a refund.
Do you do calls?
No calls. I communicate by Fiverr text chat only, with detailed written updates in English or Chinese.
