Hi, when zooming in to the tree in https://bertt.github.io/cesium_issues/cmpt_tree_disappears/tree_north/
the tree disappears:
The tileset has a composite tile (0_0_0.cmpt), containing 2 I3dm models (one for the red box, one for the tree), each model has 1 instance.
Some more observations:
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When changing positions of the tree and box (so the tree is south), the same happens to the tree (depending on camera position) - see https://bertt.github.io/cesium_issues/cmpt_tree_disappears/tree_south/
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When using a CMPT with 1 I3dm with 2 tree instances it does not happen, see https://bertt.github.io/cesium_issues/cmpt_tree_disappears/2_trees/