Function pack_vertices_from_xyz 

pub fn pack_vertices_from_xyz(
    device: &Arc<Device>,
    queue: &Arc<Queue>,
    inputs: &Scatter3GpuInputs,
    params: &Scatter3GpuParams,
) -> Result<GpuVertexBuffer, String>

Builds a GPU-resident vertex buffer for scatter3 plots directly from provider-owned XYZ arrays with either single- or double-precision inputs.