Use exisiting variable

src/pulsaranimationwidget.cpp

@@ -437,7 +437,7 @@ void PulsarAnimationWidget::paintGL()
                 // Pinnacle of cone is shared vertex for fan, moved up z-axis
                 // to produce a cone instead of a circle
                 glColor3f(1.0f, 1.0f, 0.0f);
-                glVertex3f(0.0f, 0.0f, 3.0f);
+                glVertex3f(0.0f, 0.0f, m_pulsarBeamLength);
 
                 // Loop around in a circle and specify even points along the circle
                 // as the vertices of the triangle fan (32 sections)
@@ -457,7 +457,7 @@ void PulsarAnimationWidget::paintGL()
             glBegin(GL_TRIANGLE_FAN);
             {
                 glColor3f(0.66f, 0.66f, 0.0f);
-                glVertex3f(0.0f, 0.0f, 3.0f);
+                glVertex3f(0.0f, 0.0f, m_pulsarBeamLength);
                 for(angle = 0.0f; angle < (2.0f*PI); angle += (PI/32.0f)) {
                     x = m_pulsarBeamInnerRadius * sin(angle);
                     y = m_pulsarBeamInnerRadius * cos(angle);