OpenGL Tutorial 15 - Stencil Buffer & Outlining

[@dmaster20ify]

Oh man. Outlining code is so sweet.

[@PaulEmsley]

This is extremely valuable!

[@VictorGordan]

Good to hear that :)

[@navidkhoshavi6420]

Very good explanation.

[@VictorGordan]

Thank you! :)

[@diahaidificbs]

This is awesome thanks a lot you’re great

[@VictorGordan]

Thx!

[@N1664datsnvtz]

6:36 That's how Omega Zero looks like on 3D. I hate how Omega Zero doesn't have that in Megaman X DiVE.

[@osys7832]

or we can use glm::scale(..) with the vertices we have to make it bigger.

[@jorgevillarreal2245]

Could it be possible to detect hard edges and use the bisector between the normals to solve the second method fault ?

[@VictorGordan]

Hmmm, not sure tbh. I'd say hard edges are not that easy to detect afaik

[@oskarkassander7063]

Hi, im a bit late but I hope someone will read this and help me out. I follow the tutorial and it works, but if i have other objects in my scene like a floor, the outline is rendered behind the floor

[@arthyv8104]

Your tutorial is very clear and easy to understand ,is it possible to do OpenGL in android using 3D assests models and also make it as a tutorial ??...

[@VictorGordan]

Thank you! I am unsure about android. I was actually thinking of doing smth on android with OpenGL. If I figure it out, I'll probably make a tutorial on it ;)

[@U_Geek]

For anyone who is like me and none of the methods work becasue, maybe you want to show a user imported model. You can make a new fbo, and draw each mesh with it's own unique flat color shader, then load that fbo texture into your post processing on top of the actual render and then apply an edge detector to the outline fbo, if the absolute value of the edge detector's output is above a threshold, you can draw a flat color instead of the render, this results in a mesh independant outline, that doesn't need any special meshes and doesn't have the gaps that the normal offset one has.

[@jeffg4686]

I always see "outlining" as the example for stencil buffer usage. It's cool, but I was wondering if anyone can suggest other effects that can be done with stencil buffers. thanks for any suggestions.

[@VictorGordan]

It's also used for portals or mirrors ;)

[@jeffg4686]

@@VictorGordan - Thanks - I watched a video not long after which was showing a cube with different environments inside each 'face' of the cube. very cool.

[@rakhuu4367]

you can also create reflections with stencil buffer

[@gemigames154]

Even though I have no plans to make this framework, I'm loving this video series. I have a question about the outlines though. Is it possible to apply a 2D grow edge shader pass to the stencil buffer to have a consistant line thickness regardless of model distance? Or I imagine you could take the distance of the vertex from the camera and use that as a scaler for the normal displacement of the stencil model to get consistant thickness.

[@VictorGordan]

Yeah, you can also do it by taking the 2D approach, but then you can't really do it in one shader.

[@gemigames154]

@@VictorGordan Ah I see. Thanks!

[@coderflowerdev]

For some reason that outline is being rendered below the model. Any ideas on how to fix it?

[@Relics_tv]

Same

[@aryangoswami3643]

Keep it up

[@VictorGordan]

Thank you, I will! :)

[@tudor74277]

You're great!

[@SAMUSTORM]

Could you do a tutorial on how to import imgui into our projects ??

[@VictorGordan]

Yup, I'll likely do that at some point! Might even be the next video :)

[@PhamAnhKhoa118]

Can you please make an instruction how to implement a mirror using stencil buffer or can you share me any sources that help do this in the easiest way because I find stencil buffer somehow difficult to understand.

[@VictorGordan]

Sorry but I don't know of any good resources, and I don't think I'll get around to it anytime soon :( But maybe this will help? stackoverflow.com/questions/20511599/how-do-i-draw-a-mirror-mirroring-something-in-opengl

[@PhamAnhKhoa118]

@@VictorGordan thank you bro!

[@dmitrykolesnikovich]

So, what if I need more then single one stencil buffer at a time?

[@VictorGordan]

I've never tried this before, but I believe you simply need multiple framebuffers and draw calls

[@dmitrykolesnikovich]

@@VictorGordan so i can use framebuffer as a stencil buffer?

[@VictorGordan]

You should be able to use a texture that is attached to a framebuffer as a stencil buffer. Look at my framebuffer tutorial, I make a depth buffer there for the framebuffer. You should be able to apply the same principle but with stencil buffers instead of depth buffers ;) Good luck!

[@PaulEmsley]

Where did the crow come from (who is the artist?) What is the license? (I checked the repo, I didn't see a special note) Thanks.

[@VictorGordan]

It's in the description under "Resources" ;)

[@PaulEmsley]

@@VictorGordan Thank you (it's under "References"). To answer my questions, sketchfab, the artist is AntijnvanderGun and the license is CC Attribution.

[@ArtyIF]

not to be that guy but first thanks to youtube recommendations lol

[@VictorGordan]

lol, no problem haha Thx for watching!

[@noname-ni3hp]

i didnt quite understand is the mesh is huge or my camera view is small

[@noname-ni3hp]

sorry my camera view was small its should be Camera camera(width, height, glm::vec3(0.0f, 0.0f, 50.0f));

[@manpotato295]

texture works with sword but not crow.. why?

[@abdousekhi4933]

bro please i need help i make 3d game engine using opengl and c# i now i want to implement 3d mesh collision detection what should i do

[@VictorGordan]

I have an upcoming series on Physics, so you can stick around for that :)

[@titanovsky]

Thanks.

[@VictorGordan]

Np :)

[@clifflin2307]

I'm expecting the tutorial of Blender!! haha

[@VictorGordan]

I recommend Blender Guru's tutorials for that!