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  Opengl - Light looks different?  (Read 560 times)
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Offline ddfh

Junior Devvie

Medals: 1

« Posted 2013-04-06 13:31:06 »


I'm programming with LibGDX.

I added this code:
       float lightColor1[] = {1.0f, 1.0f, 1.0f, 1.0f}; //Color (0.5, 0.2, 0.2)
       float lightPos1[] = {-1.0f, 0.5f, 0.5f, 0.0f};
       gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_DIFFUSE, lightColor1, 0);
       gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_POSITION, lightPos1, 0);

I have two different smartphones. The Light looks different on this two smartphones. I don't know why?

On the first smartphone the light is weak and  on the second smartphone the light is bright.


OK. Now I programmed this:

      // Create light components
      float ambientLight[] = { 1f, 1f, 1f, 1.0f };
      float diffuseLight[] = { 1f, 1f, 1f, 1.0f };
      float specularLight[] = { 1f, 1f, 1f, 1.0f };
      float position[] = { 0f,0f, 5.0f, 1.0f };

      // Assign created components to GL_LIGHT0
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, ambientLight, 0);
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, diffuseLight, 0);
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_SPECULAR, specularLight, 0);
      gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, position, 0);

It's now a little bit better, but on the small smartphone the texture looks brighter.
Offline delt0r

JGO Knight

Medals: 33
Exp: 18 years

Computers can do that?

« Reply #1 - Posted 2013-04-06 16:39:51 »

Yes they will look different. Without calibrating both devices and using  a proper color space like sRGB it will always be like this. Even doing that it will genrally look different. Brightness even more so, since even age of the monitor/screen will affect that. Screens are different, look different in different lighting conditions (your eyes do a bit white balance as it turns out), etc.  doubly so on phones where screens are definitely  not high end desktop publishing quality aka are not the calibration kind.

Its not suppose to look identical on different devices. Its suppose to look sort of the same.

I have no special talents. I am only passionately curious.--Albert Einstein
Offline ddfh

Junior Devvie

Medals: 1

« Reply #2 - Posted 2013-04-06 18:29:55 »

Oh... OK.

I also first thought the same but then I thought, maybe I programmed it wrong.
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