Hi
I am playing with OpenGL and especially light in OpenGL. I have tried
to set light in the GLSurfaceView application in ApiDemos (Under
Graphics / OpenGL ES).
I just try to set the light as simple as I can. Therefore I just add a
few lines to CubeRenderer.drawFrase so that it looks as shown below. I
get some light effect, but it does not look like the light is
constantly comming from one direction. I looks like the light source
is also flying around. Why is that?
public void drawFrame(GL10 gl) {
/*
* Usually, the first thing one might want to do is to clear
* the screen. The most efficient way of doing this is to use
* glClear().
*/
gl.glClear(GL10.GL_COLOR_BUFFER_BIT |
GL10.GL_DEPTH_BUFFER_BIT);
/*
* Now we're ready to draw some 3D objects
*/
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
// Here start of lines I have added to get "light"
gl.glEnable(gl.GL_LIGHTING);
gl.glEnable(gl.GL_LIGHT0);
float ambientLight[] = { 0.0f, 0.0f, 0.0f, 1.0f };
float diffuseLight[] = { 1.0f, 1.0f, 1.0f, 1.0f };
float specularLight[] = { 1.0f, 1.0f, 1.0f, 1.0f };
float position[] = { 3.0f, 3.0f, 3.0f };
gl.glLightfv(gl.GL_LIGHT0, gl.GL_POSITION, position, 0);
gl.glLightfv(gl.GL_LIGHT0, gl.GL_AMBIENT, ambientLight, 0);
gl.glLightfv(gl.GL_LIGHT0, gl.GL_DIFFUSE, diffuseLight, 0);
gl.glLightfv(gl.GL_LIGHT0, gl.GL_SPECULAR, specularLight, 0);
// Here end of lines I have added to get "light"
gl.glTranslatef(0, 0, -3.0f);
gl.glRotatef(mAngle, 0, 1, 0);
gl.glRotatef(mAngle*0.25f, 1, 0, 0);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
mCube.draw(gl);
gl.glRotatef(mAngle*2.0f, 0, 1, 1);
gl.glTranslatef(0.5f, 0.5f, 0.5f);
mCube.draw(gl);
mAngle += 1.2f;
}
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