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Rendering artifacts in BOX-shaped voxels #11894

@jjhembd

Description

@jjhembd

What happened?

As reported by @ggetz in #11875: the BOX-shaped voxel shows some rendering artifacts.

image image

So far, we have only been able to reproduce the artifact on a Mac.

Reproduction steps

  1. Load this local Sandcastle on a Mac
  2. When loaded, rotate toward the upper left of the side facing the camera, and zoom out somewhat
  3. Adjust zoom and step size until the artifact appears

Sandcastle example

http://localhost:8080/Apps/Sandcastle/index.html#c=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

Environment

Browser: Chrome
CesiumJS Version: 1.115
Operating System: Mac OS

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