[code-reflection] RFR: Hat view face culling

[Gary Frost]

Small example-view changes.

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Commit messages:
 - Remove ZPos and use zordered
 - Remove ZPos and use zordered
 - add zplane to 3x2 triangle
 - add zplane to 3x2 triangle

Changes: https://git.openjdk.org/babylon/pull/696/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=696&range=00
  Stats: 604 lines in 29 files changed: 228 ins; 176 del; 200 mod
  Patch: https://git.openjdk.org/babylon/pull/696.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/696/head:pull/696

PR: https://git.openjdk.org/babylon/pull/696