Billboarding With The Geometry Shader // OpenGL Tutorial #45

This video is an introduction to the Geometry Shader in OpenGL. We use the Geometry Shader to develop a billboarding demo where a texture is always presented in front of the camera.
Timecodes:
0:00 Introduction
0:56 Geometry Shader overview
3:59 Demo 1
5:52 GS code review
8:47 Demo 2 - Billboarding
10:20 Demo 2 code review
11:59 Outro
Make sure to watch all the previous tutorials in the "OpenGL For Beginners" playlist at • OpenGL for Beginners
Please visit ogldev.org to see more of my tutorials on modern OpenGL.
Link to source: github.com/emeiri/ogldev/blob...
If you want to get the same version of the code that was used in the video checkout the tag 'TUT_45_BILLBOARDING'.
OpenGL 4.6 specification: www.khronos.org/registry/Open...
Feel free to comment below.
Email: [e-mail]
Instagram: @ogldev1
Github: github.com/emeiri/ogldev.git
Twitter: @ogldev
One time donations (Paypal): ogldev.org/donate.html
Patreon: / ogldev
Credits:
* Sounds from zapsplat
* Music | "Lose You" by LiQWYD
Watch: • LiQWYD - Lose You [Off...
License: www.liqwydmusic.com/how-to-use
Download/Stream: hypeddit.com/liqwyd/loseyou-free
* Images by OpenClipart-Vectors from Pixabay
Enjoy,
Etay Meiri
#opengl #ogldev #opengtutorials

[@OGLDEV]

Clone the sources: git clone --recurse-submodules github.com/emeiri/ogldev.git If you want to get the same version that was used in the video you can checkout the tag 'TUT_45_BILLBOARDING'. Build on Linux: cd ogldev/tutorial45_youtube && ./build.sh Build on Windows: Open the Visual Studio solution: ogldev\Windows\ogldev_vs_2022\ogldev_vs_2022.sln Build the project 'OpenGL Tutorials\Tutorial45' Things to try: - The Billboard presented here may not be optimal because it "grows" from the bottom left corner which mean that it turns around this corner which looks a bit weird. With a minor change you can make it turn around its center.

[@SkyGrel19]

Very clear explanation of GS, thank you!

[@OGLDEV]

Glad you enjoyed it!

[@cheerwizard21]

Horror intro 👀😄 Thanks for tutorial!

[@OGLDEV]

No problem 😊

[@idratherbewithmycatrightnow]

Is this method for billboarding more efficient than instancing? Love your videos btw they are a godsend 🙏

[@OGLDEV]

Thanks! It is difficult to say up front which is more efficient. There may be differences between hw vendors and drivers. The GS approach sends less data to the GPU but the extra vertices will be generated on the GPU anyway. I think the calculations with the GS approach are simpler.

[@idratherbewithmycatrightnow]

@@OGLDEV I wish youtube sent me a notification of your answer... Thanks so much again! I will go with your method thank you!

[@miguelmyers8929]

do you have any video on how to generate normal maps?

[@OGLDEV]

Sorry, I don't have a video about that. AFAIK, you usually accomplish that using tools like gimp or Photoshop.

[@_jose_antonio_]

this white code editor burns my eyes, but great tutorial.

[@OGLDEV]

Thanks! In the last two tutorials I've switched to a dark theme.