[birt-dev] Checkin: Bugzilla#162155 - Null values in Y series of 3D Area

["Yulin Wang" <yulin.wang@xxxxxxxxxxx>]

- Summary:
Null values in Y series of 3D Area chart should not be shown

- Bugzilla Bug (s) Resolved:
162155

- Description:
1. Handle null values as the minimum in 3D just like the behavior in 2D.
2. Resolved an algorithm issue that duplicate 3d points produce wrong normal.
3. Resolved a clipping issue in stacked Area chart.

- Tests Description: Manual Test

- Notes to Build Team: N/A

- Notes to Developers: N/A

- Notes to QA: N/A

- Notes to Documentation: N/A

- Files Edited:

/org.eclipse.birt.chart.engine.extension/src/org/eclipse/birt/chart/render/Area.java
/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/Object3D.java
/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith3DAxes.java

- Files Added:

- Files Deleted