Comments on: 11. OpenGL Lighting http://www.swiftless.com/tutorials/opengl/lighting.html Game Programming and Computer Graphics Tutorials Wed, 01 Feb 2012 09:19:36 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Swiftless http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-1633 Swiftless Sat, 30 Apr 2011 04:40:30 +0000 http://swiftless.com/wordpress/?p=159#comment-1633 Hi Fiona, That is because glutSolidCube also includes the normals associated with the faces. In order to get lighting to work on standard GL_QUADS, GL_TRIANGLES, etc, you need to assign a normal to either each vertex or each face, so that the lighting algorithm has something to compare the light to the surface. Cheers, Swiftless Hi Fiona,

That is because glutSolidCube also includes the normals associated with the faces. In order to get lighting to work on standard GL_QUADS, GL_TRIANGLES, etc, you need to assign a normal to either each vertex or each face, so that the lighting algorithm has something to compare the light to the surface.

Cheers,
Swiftless

]]> By: Fiona http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-1632 Fiona Fri, 29 Apr 2011 14:48:08 +0000 http://swiftless.com/wordpress/?p=159#comment-1632 Hi, the lighting works fine if I use primitive 3D objects such as glutSolidCube. But it doesn't work if I create the cube using GL_QUADS. I wonder why is it like that :S And if you can tell me what is the solution to this matter, I'd be really grateful. Thank you :) Hi, the lighting works fine if I use primitive 3D objects such as glutSolidCube. But it doesn’t work if I create the cube using GL_QUADS. I wonder why is it like that :S And if you can tell me what is the solution to this matter, I’d be really grateful. Thank you :)

]]> By: oldnewbie http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-1564 oldnewbie Sat, 12 Mar 2011 23:57:39 +0000 http://swiftless.com/wordpress/?p=159#comment-1564 I think previous tutorials (those at the beginning) were more explanatory,I wish you kept these more important tutorials longer. I think previous tutorials (those at the beginning) were more explanatory,I wish you kept these more important tutorials longer.

]]> By: Swiftless http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-959 Swiftless Thu, 09 Sep 2010 21:03:34 +0000 http://swiftless.com/wordpress/?p=159#comment-959 Hi KylBlz, I'm going to disagree with you there and suggest setting the clear depth and clear color during your rendering loop for the sake of getting into the habit. For basic OpenGL applications you will often only need the one setting, but once you get into multiple rendering passes and start trying more advanced OpneGL, you will often have to vary these values at different times Cheers, Swiftless Hi KylBlz,

I’m going to disagree with you there and suggest setting the clear depth and clear color during your rendering loop for the sake of getting into the habit. For basic OpenGL applications you will often only need the one setting, but once you get into multiple rendering passes and start trying more advanced OpneGL, you will often have to vary these values at different times

Cheers,
Swiftless

]]> By: KylBlz http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-958 KylBlz Thu, 09 Sep 2010 20:57:11 +0000 http://swiftless.com/wordpress/?p=159#comment-958 Hi, You should try to define glClearColor and glClearDepth in your init() method. From then on, calling glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); will automatically clear those bits to the defined colors in init(). Hi, You should try to define glClearColor and glClearDepth in your init() method. From then on, calling glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); will automatically clear those bits to the defined colors in init().

]]> By: Swiftless http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-685 Swiftless Sat, 01 May 2010 11:06:19 +0000 http://swiftless.com/wordpress/?p=159#comment-685 Hi Lonelobo, Unless you are going to call the lighting init after the gluLookAt, there is no reason to call it in the display function. Although if you add a camera of some sort, then it is best to place the light position after the camera. This is because the camera uses the current model view matrix to transform it's position by. Cheers, Swiftless Hi Lonelobo,

Unless you are going to call the lighting init after the gluLookAt, there is no reason to call it in the display function.

Although if you add a camera of some sort, then it is best to place the light position after the camera.

This is because the camera uses the current model view matrix to transform it’s position by.

Cheers,
Swiftless

]]> By: Lonelobo http://www.swiftless.com/tutorials/opengl/lighting.html/comment-page-1#comment-684 Lonelobo Sat, 01 May 2010 10:45:52 +0000 http://swiftless.com/wordpress/?p=159#comment-684 This piece of code doesn't seem to work in my project. Must whe not call void init (void) in the display fuction or so? This piece of code doesn’t seem to work in my project. Must whe not call void init (void) in the display fuction or so?

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