| vertexCount | The number of vertices to allocate, with a maximum limit of 65535 (or UInt16.MaxValue). |
| indexCount | The number of triangle list indices to allocate, where every three indices represent one triangle. Therefore, this value should always be a multiple of three. |
| vertices | The returned vertices. |
| indices | The returned indices. |
Allocates the specified number of vertices and indices from a temporary allocator.
You can only call this method during the mesh generation phase of the panel and shouldn't use it beyond.