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Research into the processes of photoionised nebulae plays a significant partin our understanding of stellar evolution. It is extremely difficult tovisually represent or model ionised nebula, requiring astronomers to employsophisticated modelling code to derive temperature, density and chemicalcomposition. Existing codes are available that often require steep learningcurves and produce models derived from mathematical functions. In this articlewe will introduce PyCross: PyCloudy Rendering Of Shape Software. This is apseudo 3D modelling application that generates photoionisation models ofoptically thin nebulae, created using the Shape software. Currently PyCross hasbeen used for novae and planetary nebulae, and it can be extended to ActiveGalactic Nuclei or any other type of photoionised axisymmetric nebulae.Functionality, an operational overview, and a scientific pipeline will bedescribed with scenarios where PyCross has been adopted for novae (V5668Sagittarii (2015) & V4362 Sagittarii (1994)) and a planetary nebula (LoTr1).Unlike the aforementioned photoionised codes this application does not requireany coding experience, nor the need to derive complex mathematical models,instead utilising the select features from Cloudy/PyCloudy and Shape. Thesoftware was developed using a formal software development lifecycle, writtenin Python and will work without the need to install any developmentenvironments or additional python packages. This application, Shape models andPyCross archive examples are freely available to students, academics andresearch community on GitHub for download(https://github.com/karolfitzgerald/PyCross_OSX_App).

Introducing PyCross: PyCloudy Rendering Of Shape Software for pseudo 3D ionisation modelling of nebulae