To make the transparency of background work you have to switch off the opacity of the chart's view instance just after you created it.
You need the following code:
m_view.setBackgroundColor(Color.TRANSPARENT); m_view.getChart().setBackground(new NChartSolidColorBrush(Color.TRANSPARENT));
However this can hit the performance in some cases, because NChart3D is based on OpenGLES and alpha-blending of its grapical content with other UI may be inefficient.
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