m_dViewDiameter = sin (m_dFanBeamAngle / 2) * m_dFocalLength * 2;
if (! ((iNViews == 750 && lDataLength == 1560000L) || (iNViews == 950 && lDataLength == 1976000L)
m_dViewDiameter = sin (m_dFanBeamAngle / 2) * m_dFocalLength * 2;
if (! ((iNViews == 750 && lDataLength == 1560000L) || (iNViews == 950 && lDataLength == 1976000L)