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POAndroid OpenGL skybox light not really working
 

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  1. POAndroid OpenGL skybox light not really working
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    <p>Okay, I have made a "skybox" (it's actually 5 plane, because of the different textures). It's works fine, but there is a problem with the lightning. It's not my strongest point in OpenGL, so I will be not surprised if the answer is not so hard.</p> <p>So that is my start position view. As you can see the front plane is bright, but the left, top, right are not really, and there is a border between them and the front.</p> <p><a href="http://img696.imageshack.us/img696/3673/light01.png" rel="nofollow">http://img696.imageshack.us/img696/3673/light01.png</a></p> <p>When I go to the absolute center (nearly) of the skybox then the border are not so visible (I guess at the absolute center there is no border.</p> <p><a href="http://img233.imageshack.us/img233/2949/light02.png" rel="nofollow">http://img233.imageshack.us/img233/2949/light02.png</a></p> <p>First I tried with one light at the posistion (0,0,0) with these settings, but nothing, I tried to change the ambient, the diffuse, but not really helps:</p> <pre><code> private float[] lightAmbient = {0.5f, 0.5f, 0.5f, 1.0f}; private float[] lightDiffuse = {1.0f, 1.0f, 1.0f, 1.0f}; private float[] lightPosition = {0.0f, 0.0f, 0.0f, 1.0f}; public void onSurfaceCreated(GL10 gl, EGLConfig config) { gl.glEnable(GL10.GL_DITHER); gl.glEnable(GL10.GL_TEXTURE_2D); gl.glShadeModel(GL10.GL_SMOOTH); gl.glClearColor(0, 0, 0, 0); gl.glClearDepthf(1.0f); gl.glEnable(GL10.GL_DEPTH_TEST); gl.glDepthFunc(GL10.GL_LEQUAL); gl.glEnable(GL10.GL_LIGHT0); gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST); gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, lightAmbientBuffer); gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, lightDiffuseBuffer); gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, lightPositionBuffer); } public void onDrawFrame(GL10 gl) { gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glLoadIdentity(); gl.glEnable(GL10.GL_LIGHTING); GLU.gluLookAt(gl, eyeX, eyeY, eyeZ, centerX, centerY, centerZ, 0.0f, 1.0f, 0.0f); } public void onSurfaceChanged(GL10 gl, int width, int height) { if(height == 0) { height = 1; } gl.glViewport(0, 0, width, height); gl.glMatrixMode(GL10.GL_PROJECTION); gl.glLoadIdentity(); GLU.gluPerspective(gl, 65.0f, (float)width / (float)height, 1.0f, 80.0f); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glLoadIdentity(); } </code></pre> <p>So the question is how can I make this to work in every place where I am. I hope someone can help me, because now it's not really looking nice (without light is good, but I don't really want a night scene, ecspecially with a texture where there is the sun :).</p> <p><strong>EDIT (how it works now)</strong>: as it was in the answer there are no normals for the skybox anymore, but after I have enabled lightning I was needed to add this line to the code, and now it works like a charm, and the sky is bright everywhere.</p> <pre><code> gl.glLightModelf(GL10.GL_LIGHT_MODEL_TWO_SIDE, GL10.GL_TRUE); </code></pre>
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    1. USmatthew3r
    1. USmatthew3r
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    1. COWhy aren't you making your world inside a sphere? That would take away the whole lighting problem if you define correct normals for every vertex in the sphere.
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      1. USWroclai
    2. COHmm. It's actually not a bad idea, maybe if there will be no really answer until tomorrow, then I will try it out. What' the problem is, that I don't really know how to create a sphere. (Maybe I do one in Blender and somehow import it, because manually I dont really know how can man do that.)
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      1. POAndroid OpenGL skybox light not really working
      1. USmatthew3r
    3. COThere are manual ways to achieve that (with some work). Check out this: http://www.swiftless.com/tutorials/opengl/sphere.html
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      1. POAndroid OpenGL skybox light not really working
      1. USWroclai
 

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