OpenGL Tutorial 17 - Transparency & Blending

In this tutorial I'll show you how to easily integrate transparency into your OpenGL project, and how to make use of the blending function.

*Source Code & Models*

*OpenGL Documentation*

*Discord Server*

*Patreon*

*Timestamps*
0:00 Introduction
0:10 RGBA
0:25 Transparency
0:53 Adding Windows
1:21 Blending Theory
2:50 Implementing Blending
3:11 The Problem with Blending
3:33 Solution
4:26 Disclosure & Ending

*References*

#opengl #opengltutorial #computergraphics #cpp #visualstudio

[fudgeracoon]

discovered your channel a couple of days ago and absolutely loving the content. It's a godsend especially since I started learning opengl a couple of weeks ago. Keep it up man, looking forward to more tutorials!

[gamemakertim]

Thank you for this, I was looking for a way to not render the alpha channel of my sprites. And the discard keyword was exactly what I needed. Thanks again!

[serein]

Just really appreciate your explaining when I need it!

[PhamAnhKhoa]

Hope to see your next video as soon as possible!!!

[VictorGordan]

A small note for this video. You need to add the TRS transformations as inputs to the Draw function from the model class. Look at the source code (Model and Mesh classes, both the header files and cpp files, I only changed the Draw functions) to see exactly what I mean :)

[ИгорьСечко-ми]

low-level graphics programming is extremely interesting

[lanchanoinguyen]

How to do the grass blend without the grass being transparent?Which blend mode source and destination you used?

[SAMUSTORM]

Victor you are wonderful <3, have you already thought of something about Vulkan ??

[sumitgupta]

wouldn't it be time consuming if we have large number of Objects in our scene and we have to sort them each time in the loop based on the camera position? This will reduce the fps too.

[把嘴缝起来]

my dear teacher, when will i can get your new video.

keep on this, you are the best

[silvertakana]

4:48 what other weird methods are you talking about? I have tried looking online but wasn’t able to (I'm sure it’s just my horrible searching skills.) Could you share some resources?

[lukasjetu]

for some reason, when i tried to delete the code for the windows, it didn't work, it just left me with a grass texture with black background, only happens when i don't draw it, if i draw only one, it works, but when i don't draw any window, it doesn't work, deleting the whole code for windows from the main file also doesn't work, switching release to debug also doesn't work, i'm lost

[generalratchet]

What should I do when two meshes are in the same position but one's like the outer layer of the other, for example a head and a bunch of planes that simulate hair? Applying sorting wouldn't work since both are in the same position. I also tried the "if alpha is less than .1 then discard" but I still get the inner layer completely gone

[rudrasingh]

I have a problem. When running the project in debug mode in Visual Studio it runs fine but when I build the project and then run the exe it gives a Visual C++ runtime library error.

[diogobatista]

What is the source and what is the destination ?

[cbk]

Why are you telling us this in a bunch of code? Is this so hard . Wouldn't it be simpler if you draw 2 rectangles and explain?

[iUniversEi]

Thank you for wasting almost five minutes of your viewer's time, just to tell them at THE END of the video, that you're NOT going to explain how to get transparency working right....