Lighting does not work with gluSphere
This is a simple issue that I'm somewhat ashamed to ask for help on.
I'm making a simple call to gluSphere to render a sphere, however, it does not light properly even though I'm pretty sure I added the normals and lighting correctly. If, however, I add a texture, the model lights normally, except it seems to be always SMOOTH, and I cannot change it to flat.
This is the lighting code in my init() function:
gl.glLightfv( GL.GL_LIGHT0, GL.GL_AMBIENT , AMBIENT_LIGHT, 0 );
gl.glLightfv( GL.GL_LIGHT0, GL.GL_DIFFUSE , DIFFUSE_LIGHT, 0 );
gl.glLightfv( GL.GL_LIGHT0, GL.GL_POSITION, light_pos , 0 );
gl.glEnable ( GL.GL_LIGHT0 );
gl.glEnable ( GL.GL_LIGHTING );
this is my sphere code in my display() function:
gl.glColor3d(1.0, 1.0, 1.0);
glu.gluQuadricDrawStyle (quad, GLU.GLU_FILL);
glu.gluQuadricNormals (quad, GLU.GLU_FLAT);
glu.gluQuadricOrientation(quad, GLU.GLU_OUTSIDE);
glu.gluSphere(quad, 1.0, lat, lon);
Please advise.
EDIT: light values:
public final static float[] DIFFUSE_LIGHT = { 1.0f, 1.0f, 1.0f, 1.0f };
public final static float[] AMBIENT_LIGHT = { 0.3f, 0.3f, 0.3f, 1.0f };
public float[] light_pos = { -2.0f, 2.0f, 10.0f, 0.0f };
added materials, no change:
gl.gl开发者_运维问答Materialfv(GL.GL_FRONT, GL.GL_AMBIENT , new float[]{0.5f, 0.5f, 0.5f, 1.0f}, 0);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE , new float[]{1.0f, 1.0f, 1.0f, 1.0f}, 0);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_SPECULAR, new float[]{0.7f, 0.7f, 0.7f, 1.0f}, 0);
gl.glMaterialf (GL.GL_FRONT, GL.GL_SHININESS, 0.5f);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_EMISSION, new float[]{0.3f, 0.3f, 0.3f, 0.0f}, 0);
EDIT2:
Blah, I figured i had a:
gl.glEnable(GL.GL_TEXTURE_2D);
active somewhere and it was causing my model not to have shading if there was no texture associated with it. -_- carry on good people, carry on.
I encountered lighting problem too and figured out that i need to add glEnable(GL_NORMALIZE)
.
What kind of lighting are you expecting? The third parameter to glLightfv is supposed to be the values of the light you are setting.
- Are there any translations/rotations you do that may affect the position of the light?
- Is GL_COLOR_MATERIAL enabled or disabled? It may overwrite your material settings if it is.
- Even if your code is not enabling GL_TEXTURE_2D, you should try disabling it manually right before the line is reached, just in case.
- If you wish to ignore gluSphere completely, there's some code in this thread that you can use.
精彩评论