  Building Information Modeling (BIM) describes a central data pool covering
the entire life cycle of a construction project. Similarly, Building Energy
Modeling (BEM) describes the process of using a 3D representation of a building
as a basis for thermal simulations to assess the building's energy performance.
This paper explores the intersection of BIM and BEM, focusing on the challenges
and methodologies in converting BIM data into BEM representations for energy
performance analysis. BEMTrace integrates 3D data wrangling techniques with
visualization methodologies to enhance the accuracy and traceability of the
BIM-to-BEM conversion process. Through parsing, error detection, and
algorithmic correction of BIM data, our methods generate valid BEM models
suitable for energy simulation. Visualization techniques provide transparent
insights into the conversion process, aiding error identification, validation,
and user comprehension. We introduce context-adaptive selections to facilitate
user interaction and to show that the BEMTrace workflow helps users understand
complex 3D data wrangling processes.
