Comments on: 8. Bump Mapping in GLSL

By: Nick

Nick — Mon, 30 Jan 2012 04:53:28 +0000

Hey, nice job on the GLSL tutorials, I’ve finally come to understand and run a toon shader based on what I learned here.

I’ve been testing this with a glut teapot, and I can’t see the effects of the bump mapping shade. Should I be noticing anything different with the teapot? Or will I have to render a complex model?

By: BabyStuey

BabyStuey — Mon, 10 Oct 2011 08:18:31 +0000

You’ve probably figured this out by now, but I was able to copy shader.h and shader.cpp from any of the previous lessons in this tutorial. The files don’t change at all between lessons 2 through 7, so just copy the files from any of those and they’ll work fine.

By: [GLSL] Bump Map « 逍遙文工作室

[GLSL] Bump Map « 逍遙文工作室 — Wed, 07 Sep 2011 19:20:10 +0000

[...] 參考：8. Bump Mapping in GLSL、Bump Mapping using GLSL、OpenGL:Tutorials:GLSL Bump Mapping、Normal Mapping Demo。 Share this:ShareEmailPrintFacebookTwitterLike this:LikeBe the first to like this post. [...]

By: Wayne

Wayne — Mon, 25 Jul 2011 19:53:24 +0000

Where is “Shader.h”?

By: MarioL

MarioL — Tue, 24 May 2011 13:56:00 +0000

Sorry Swiftless, my bad. I should have read every paragraph carefully.

Keep on the good work.

MarioL

By: Swiftless

Swiftless — Fri, 20 May 2011 02:16:29 +0000

Hi MarioL,

I thought I had mentioned in the tutorial that you can go on to tangent based bump mapping techniques which take into account geometry tranformations.

You are exactly on the right track though! Good work.

Cheers,
Swiftless

By: MarioL

MarioL — Thu, 05 May 2011 15:57:03 +0000

I was checking your OpenGL 4 tutorials, which are great btw, and I stumbled on this one. I implemented a bump mapping in the past so I was interested to see your technique.

I seems to me that the way you implemented it is too simplistic and can only work if the geometry is facing up. If the orientation of the object changes, the values inside the normal map won’t consider it and the lighting will not be accurate.
You need to take the geometry and the orientation of the object into account. You either have to bring the normals from the normal map into the object space or bring the light into the space of every face of the geometry you render.

By: Swiftless

Swiftless — Tue, 17 Aug 2010 02:54:52 +0000

Hey YellowMind,

This often happens when there is an error in your shader and it fails to compile.

Cheers,
Swiftless

By: YellowMind

YellowMind — Mon, 16 Aug 2010 14:07:22 +0000

Thanks for the tutorial.
My result of the program showing in the lower link is strange.

http://img148.imageshack.us/img148/3256/22014693.jpg

It seems that I made a blend of the color map and the normal map…

By: Swiftless

Swiftless — Sun, 08 Aug 2010 21:55:06 +0000

Hey Michal,

That is totally correct, it is a habit I picked up from using the fixed-function pipeline for years, but isn’t needed with GLSL.

Cheers,
Swiftless