CesiumGS / CesiumGS/cesium

Ground primitive artifact on iPad

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category - graphics type - bug
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Description

[Sandcastle link](https://sandcastle.cesium.com/index.html#c=hVfbbttGEP0VVi+lYJXe+yVxgrpO2wRo0SIx+hIFBS2tJKI0KZArp27gf+9ZksvoUrl6kbh7ZnbmzJnl6CFvkofCfXZN8iqp3OfkxrXF7j77o1tLv110jzd15fOics2305fzqsdn7cJVLluX9Z3Llm7rN7eu9ddr4Fp/65oGP+BzlZetOzYq63XeFH5zXyzeBMsfdqtVF8ER2v3tXbVMh5j6xf7hXdVu3cLXza/F30UVopp7mCEbX5Sudf4wnf6Lv7ntN9Mvya4pX8Tdd3X13rX1rlm4bNXU99ctMO+WqdSCTpOnk5y3TXFf+OLBtVm+XKbDiV0Qh8BFfu+aPFuVj7d1+mVeJfgswVJR5b6oqzGAm7zx+JVXvDv/jVs3zrXpd1pkhBhlDKdcM8HsLBEkU8YapS0T2hIpZgkVkkxnvfe6KRxq1XsfTgyfjcuXRbUeT/w195vM1++xmldtyiWPHsJnW/jF5hz2Oy72sU1dgkmSkX7paV49DUygGIsyb9tiVSy6iH6vy8d1XbWozcchtvmkbf6s6vnkRSLULK4t6rpZtmFxPulIoIRoSjknXMzAgCaccUoF44TOepasZMIawUgEKArSqBA8AriRUnFJI0BY8MZR4xEgmRLMMD0AJFVKckJGAPAEpAsbAVYLrrhgA8AAAYdURw9WSSuJ5HQEUCItImMRwKxQWuHIAUCkZpxpGz0wyjQRVI8eiAhkKDPsUwtdGCPHfaoZlRoHRwBFGoQaFQGMMIoctIoAsKo5ESNA4VSQyQcPzCgagpBjjIrDgeVCRYAxVHDz1YOBOCUDkwNAU8MRMmIaiGRUGRAfHUhqBROK29n/FXs+GTWSl77wu6XrVQKPGeHzCdQ3S061RYk9Ly5iODdcopQ0liUQZizhY8ooPcTDeQ8QVPGuEmakHTbI0Q4RB2UZIaSN2tEGeoNWZPTAuNDCKjuSdjaGszmDp7MJQ3LP5BskaVDhQWWQJHRgqJSjSMIjpDJUSGqNEqHiYwUJys24iSpSaD4dvsZuIzKko1jc15YqSawZ99Ft6J7YKoopzQLKjgDIRHPKTARA09CUUl89UArOaQTwYAMpjq1gRGgmyWOMEm2EqrCxaEpTYShjQz/jkeIKIWosmoUDNB8fs4DUFR1DMOg+kMJUdABhgFqm1ez/iH5GyDJT4ryQcZ89U1jN4ZyZ2LsCNxLajJmYkRFGICDGok5xwRn0urEjAI2GbhE0ChlaYEHNo05tyBLdGgFoBcYUHy9BYzXBFRRZRWdr3JSMfe1+S0JQOgYpraVU2TFIy5SEknC5xiCpVIJIMtJ6Ns2ztFqa6f56+NS9nFZ1k6ThDbXt30lJvTrzspoORcCbflhKt02Nuai9Cfyng4Osr8Z0Fj1mMYDwNnzqztxVi+B531VvNUsAns6rL2GM6d6bdVmHeSjOB+Exe//jm+wzpqbrcrvJU5LJfux5bjTZH4EOs4u4dG9IWLv63vnmEcOVzyukmLzYH6J+PtreN903P7QaMo3Gx0ZJ5OttgVGpWWz+23zcTY/Nk+eHqGsMoo9vXbHe+HZge3rsYn+cieNSMEAk6TZvWvdTWec+DTVKLhJGTvEYVBuUevk22pFDxNOxSe59U9ztfMfxl9OcegG8OBDAMf/X0UeXbwdJO7vT+JKk3dSfD5n9gJWzLlPk446Ietpze5DQYePcPm7dXuQne9kPv92+HYbF6WlzHDTX3a4ow9x6M7RJX5f9TvHufotGOQRm7bYsfBpug8nQJICuMHaXH5BgtYYFLoNJt4WroLsJCiySl/i66pxmpavWfoOFi4tpwHVHzn2xSvcdfdN7mvab8La3dxH2ktlwzsleOOVj8ekCYQJ30T9e0HGhT3awRRTdr0DWUQxDpMnrhExPDwoxfIS3vTUc8GkIqnF+11SJe8jLfZddWSazyVXrH0v3uq/W98X9tm58+OuUZtlliLfMoeDLu93iL+ezRdsGu6vLaHS1LB6SYvkKr6rDv5FgpdMMdla7svxQ/INr+vXVJfAHZmi7UNTfHlxT5o8BsqGvf+kXsyy7usTjqZWv6/Iub/Y8/gs). This works fine on desktop, and mostly fine on iPad:

![correct](https://user-images.githubusercontent.com/1711126/66861099-61e5f180-ef5c-11e9-9934-4013c476c482.png)

Until you zoom in a bit on iPad, you can see a seam very similar to the one in https://github.com/AnalyticalGraphicsInc/cesium/pull/8205 that moves with the camera that will cut out pieces of the polygon:

![incorrect](https://user-images.githubusercontent.com/1711126/66861104-63afb500-ef5c-11e9-8bad-1c4ece75c711.png)

I believe it's related to https://github.com/AnalyticalGraphicsInc/cesium/pull/8205 because I can see the same seam across the 3D Tileset, but using that branch the seam is fixed on the 3D Tileset but remains on the ground polygons.

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