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POLight source inside a room acting unexpectedly
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  1. POLight source inside a room acting unexpectedly
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    copied!<p>I've written several Android apps, but this is my first experience with 3D programming.</p> <p>I've created a room (4 walls, ceiling and floor) with a couple objects inside and am able to move the camera around it as if walking. I've textured all surfaces with various images and everything was working as expected. </p> <p>For context, the room is 14 units wide and 16 units deep (centered at origin), 3 units high (1 above origin and 2 below). There are 2 objects in the middle of the room, a cube and an inverted pyramid on top of it.</p> <p>Then I went to add a light source to shade the cube and pyramid. I had read through and followed a couple of NeHe's ports, so I took what I had working in the lesson on lighting and applied it to my new code.</p> <pre><code>gl.glEnable(GL10.GL_LIGHTING); gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_AMBIENT, new float[] { 0.1f, 0.1f, 0.1f, 1f }, 0); gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_DIFFUSE, new float[] { 1f, 1f, 1f, 1f }, 0); gl.glLightfv(GL10.GL_LIGHT0, GL10.GL_POSITION, new float[] { -4f, 0.9f, 6f, 1f }, 0); gl.glEnable(GL10.GL_LIGHT0); </code></pre> <p>The result is that the cube and pyramid are not shaded. They look the same on sides opposing the light as they do on the sides facing it. When the camera is pointed directly away from the light source the room looks as it did before I added the lighting code. As I rotate the camera to face the light source the entire room (including objects) becomes darker until completely black when the camera is directly facing the source.</p> <p>What is going on here? I read many articles on lighting and how it works, but I have seen nothing to indicate why this wouldn't light up all sides of the room, with the cube and pyramid shaded based on the light position. Is there some expected behavior of the light because it is "inside" the room? Am I just missing something easy because I'm new?</p>
 

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