fix SetMesh warning

[oceancx]

get warning in unity2020.3.0f1c1

SetSubMesh #1 shares part of its index buffer with SubMesh #2. Sharing part of an index buffer can result in undefined behavior and will be deprecated soon. To future-proof your Project, fix the indexStart/indexCount
UnityEngine.Mesh:SetSubMesh (int,UnityEngine.Rendering.SubMeshDescriptor,UnityEngine.Rendering.MeshUpdateFlags)
ImGuiNET.Unity.ImGuiRendererMesh:UpdateMesh (ImGuiNET.ImDrawDataPtr,UnityEngine.Vector2) (at Packages/dear-imgui-unity/ImGuiNET.Unity/Renderer/ImGuiRendererMesh.cs:127)
ImGuiNET.Unity.ImGuiRendererMesh:RenderDrawLists (UnityEngine.Rendering.CommandBuffer,ImGuiNET.ImDrawDataPtr) (at Packages/dear-imgui-unity/ImGuiNET.Unity/Renderer/ImGuiRendererMesh.cs:71)
ImGuiNET.Unity.DearImGui:Update () (at Packages/dear-imgui-unity/ImGuiNET.Unity/DearImGui.cs:157)

[Themperror]

Please do not allocate a new List<> every time that UpdateMesh is called, cache it outside the function and call Clear() on it

[oceancx]

Please do not allocate a new List<> every time that UpdateMesh is called, cache it outside the function and call Clear() on it

done

[sandrofigo]

I'd like to see this fixed in the next version, but just out of curiosity where does commit de89418 come from?

[oceancx]

I'd like to see this fixed in the next version, but just out of curiosity where does commit de89418 come from?

this commit is only useful for our inner project, you can ignore it...

[IvanXuff]

you should put descriptors.Clear(); after int idxOf = 0; , otherwise you can not draw all wanted mesh

[oceancx]

you should put descriptors.Clear(); after int idxOf = 0; , otherwise you can not draw all wanted mesh

you are right!