[osg-users] how to change project matrix temporarily?;

[wh_xiexing]

i want to implement the same effect of the following code using open scene 
graph. can it be possiable?

public void pushProjectionOffest(Double offset)
    {
        // Modify the projection transform to shift the depth values slightly 
toward the camera in order to
        // ensure the lines are selected during depth buffering.
        GL gl = this.getGL();

        float[] pm = new float[16];
        gl.glGetFloatv(GL.GL_PROJECTION_MATRIX, pm, 0);
        pm[10] *= offset != null ? offset : 0.99; // TODO: See Lengyel 2 ed. 
Section 9.1.2 to compute optimal offset

        gl.glPushAttrib(GL.GL_TRANSFORM_BIT);
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glPushMatrix();
        gl.glLoadMatrixf(pm, 0);
    }

 public void popProjectionOffest()
    {
        GL gl = this.getGL();

        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glPopMatrix();
        gl.glPopAttrib();
    }




Shawl
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