invert_matrix ( m )

For signed matrix values change the sign. For UInt8 subtract values from 255. For other unsigned types subtract values from highest occuring value.

interpolate_volume_gradient (
        vertices,
        v2m_transform,
        array,
        )

grid_indices ( size,  data_type )

interpolate_volume_data (
        vertices,
        vertex_transform,
        array,
        )

zone_masked_grid_data (
        grid_data,
        zone_points,
        zone_radius,
        invert_mask=None,
        minimal_bounds=None,
        zone_point_mask_values=None,
        )

zone_mask (
        grid_data,
        zone_points,
        zone_radius,
        invert_mask=None,
        zone_point_mask_values=None,
        )

masked_grid_data (
        grid_data,
        mask,
        mask_value=None,
        )

Indices are into the flattened full data matrix.

Matrix_Value_Statistics

Minimum, maximum, and sampled matrix values.