Advanced Options

Advanced Options#

This section covers advanced configuration options for fine-tuning your CAD to DAGMC workflow.

Topics#

Topic

Description

Geometry Scaling

Unit conversion with scale_factor

Imprinting

Shared surface handling

Implicit Complement

Void/air region tagging

Parallel Processing

Thread control for performance

H5M Backends

h5py vs pymoab comparison

Quick Reference#

Common Options#

model.export_dagmc_h5m_file(
    filename="dagmc.h5m",
    scale_factor=0.1,                      # mm to cm conversion
    imprint=True,                          # Handle shared surfaces
    implicit_complement_material_tag="air", # Tag for void space
    h5m_backend="h5py",                    # H5M writing backend
    method="file",                         # CAD transfer method
)

When to Use Each#

Option

When to Use

scale_factor

CAD in different units than simulation

imprint=False

Single volume or non-touching geometry

implicit_complement_material_tag

Need to track particles in void

h5m_backend="pymoab"

Compatibility with older DAGMC tools

method="inMemory"

Large geometry with matching OCC versions
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