Can someone please explain why (1.0f,1.0f,1.0f) is not white?

OpenGL Development JOGL Development
#1

Hi.

I am getting slightly frustrated at a seemingly simple problem. I am drawing a set of lines with the color 1.0 1.0 1.0, expecting them to be white. But they’re not. I am rendering several components with different z indexes, and the color of my lines change depending on where in my code I render them. Now I would understand why this happened, if setting my color multiplied it with some strange color settings already in my matrix, but I have checked, double checked, and triple checked that I dont. I even changed everything to push,load,render,pop, to make sure any rendering occurs on a clear matrix. Yet the color varies, depending on when I render it. Am I missing something vital, or just overlooking the obvious? I did not want to write this on a board, ashamed as I am, but at this stage, I am getting too frustrated :wink:

#2

A stab in the dark, but have you glDisable( GL.GL_LIGHTING )?

#3

I had not explicitly, but tried that now. To no avail, sadly. Enabling it turns my entire screen black, so I figure it was off by default :wink:
Thanks for trying though!

#4

Ah. I had to disable Textures! That makes my color correct :wink:

But I have to explicitly enable them again afterwards? It doesnt seem to be enough to pop the current matrix (which disabled them). Why is this so?

#5

pushmatrix and popmatrix should have no influence on the current texture-state.
use
gl.glDisable(GL.GL_TEXTURE_2D); to disable texturing and
gl.glEnable(GL.GL_TEXTURE_2D); to enable texturing.

#6

Right. My bad. I’ve been going blind over my own stuff lately. Thanks.

#7

You can however also push and pop state attributes: http://www.talisman.org/opengl-1.1/Reference/glPushAttrib.html