Function _plot_helmet

mne/viz/_3d.py:1177–1201

(
    renderer,
    info,
    to_cf_t,
    head_mri_t,
    coord_frame,
    *,
    alpha=0.25,
    scale=1.0,
)

def _plot_helmet(
    renderer,
    info,
    to_cf_t,
    head_mri_t,
    coord_frame,
    *,
    alpha=0.25,
    scale=1.0,
):
    color = DEFAULTS["coreg"]["helmet_color"]
    src_surf = get_meg_helmet_surf(info, head_mri_t)
    assert src_surf["coord_frame"] == FIFF.FIFFV_COORD_MRI
    if to_cf_t is not None:
        src_surf = transform_surface_to(
            src_surf, coord_frame, [to_cf_t["mri"], to_cf_t["head"]], copy=True
        )
    actor, dst_surf = renderer.surface(
        surface=src_surf,
        color=color,
        opacity=alpha,
        backface_culling=False,
        name="helmet",
    )
    return actor, dst_surf, src_surf


def _plot_axes(renderer, info, to_cf_t, head_mri_t):