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Thread: Lighting with OpenGL

  1. #1
    Junior Member Regular Contributor
    Join Date
    Jun 2010
    Posts
    162

    Lighting with OpenGL

    I am working with some lighting programming in OpenGL. I have a red sphere. Now when I make the diffuse light green, the sphere should look black, but I find the sphere looks still red. How can that be fixed? Please provide some suggestion.

  2. #2
    Super Moderator OpenGL Guru
    Join Date
    Feb 2000
    Location
    Montreal, Canada
    Posts
    4,256
    In old OpenGL, there is a setting called GL_LIGHT_MODEL_AMBIENT which is by default 0.2, 0.2, 0.2, 1.0.
    You can set it to zero if you want with glLightModel.
    ------------------------------
    Sig: http://glhlib.sourceforge.net
    an open source GLU replacement library. Much more modern than GLU.
    float matrix[16], inverse_matrix[16];
    glhLoadIdentityf2(matrix);
    glhTranslatef2(matrix, 0.0, 0.0, 5.0);
    glhRotateAboutXf2(matrix, angleInRadians);
    glhScalef2(matrix, 1.0, 1.0, -1.0);
    glhQuickInvertMatrixf2(matrix, inverse_matrix);
    glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
    glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

  3. #3
    Junior Member Regular Contributor
    Join Date
    Jun 2010
    Posts
    162
    I have done it by setting the diffuse material component to green and diffuse color to red. The object looks black. Is it ok?

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