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Instanced meshes are not drawn at certain camera angles when Graphics.DrawMeshInstanced method is used

Graphics Device Features


How to reproduce:
1. Open the attached '' project
2. Open '10001_00' Scene
3. Enter Play Mode
4. Pan the viewport camera using left-click mouse in Game View

Expected result: Instanced meshes are shown irrespective from the camera angle
Actual result: Instanced meshes disappear at a certain camera angle

Reproducible with: 2019.3.15f1, 2020.1.0b10, 2020.2.0a12
Could not test: 2018.4.23f1 due to errors thrown in the Console

- Video of reproduction attached in Edit
- Reproducible on macOS and Windows
- Mesh instances disappear in Game View (Draw Mesh (instanced) pass is not shown in Frame Debugger) while are present in Scene View

  1. Resolution Note:

    The observed issue is caused by incorrect mesh bounds being generated in your MakeMesh method in TerrainTussock.cs.

    The generated grass mesh is being assigned a bounding box of new Bounds(* 50000, * 100000)
    which means a bounding box centered on (-50000, -50000, -50000) of size (10000, 10000, 10000)
    The vertices of the generated grass mesh are placed outside this bounding box, with positive coordinates.

    When DrawMeshInstanced is called, if the camera is facing away from the negative axes, the incorrect bounding boxes of the grass meshes are causing them to be culled, resulting in the observed issue.

    One solution would be to generate an accurate bounding box for your mesh when generating, from the actual vertices you are generating.

    Alternatively, if you definitely want a very large bounding box then it should have the center positioned such that the bounds will actually cover the vertices of the mesh.
    For example, using
    mesh.bounds = new Bounds(, * 100000);
    instead of
    mesh.bounds = new Bounds(* 50000, * 100000);

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