Research into the processes of photoionised nebulae plays a significant part in our understanding of stellar evolution. It is extremely difficult to visually represent or model ionised nebula, requiring astronomers to employ sophisticated modelling code to derive temperature, density and chemical composition. Existing codes are available that often require steep learning curves and produce models derived from mathematical functions. In this article we will introduce PyCross: PyCloudy Rendering Of Shape Software. This is a pseudo 3D modelling application that generates photoionisation models of optically thin nebulae, created using the Shape software. Currently PyCross has been used for novae and planetary nebulae, and it can be extended to Active Galactic Nuclei or any other type of photoionised axisymmetric nebulae. Functionality, an operational overview, and a scientific pipeline will be described with scenarios where PyCross has been adopted for novae (V5668 Sagittarii (2015) & V4362 Sagittarii (1994)) and a planetary nebula (LoTr1). Unlike the aforementioned photoionised codes this application neither requires any coding experience, nor the need to derive complex mathematical models, instead utilising the select features from Cloudy / PyCloudy and Shape. The software was developed using a formal software development lifecycle, written in Python and will work without the need to install any development environments or additional python packages. This application, Shape models and PyCross archive examples are freely available to students, academics and research community on GitHub for download.

对光电离星云过程的研究在我们对恒星演化的理解中起着重要作用。视觉上很难描绘或模拟电离星云，这需要天文学家采用复杂的建模代码来得出温度，密度和化学成分。现有的代码通常需要陡峭的学习曲线并产生从数学函数得出的模型。在本文中，我们将介绍PyCross：Shape软件的PyCloudy渲染。这是一个伪3D建模应用程序，可生成使用Shape软件创建的光学薄星云的光电离模型。目前PyCross已被用于新星和行星状星云，它可以扩展到活跃银河系原子核或任何其他类型的光电离轴对称星云。将介绍在新星（V5668射手座（2015）和V4362射手座（1994））和行星状星云（LoTr1）中采用PyCross的场景，介绍功能，操作概述和科学流程。与上述光电离代码不同，该应用程序既不需要任何编码经验，也不需要导出复杂的数学模型，而是利用Cloudy /  PyCloudy和Shape中的选择功能。该软件是使用Python编写的正式软件开发生命周期开发的，无需安装任何开发环境或其他python软件包即可使用。该应用程序，Shape模型和PyCross存档示例可在GitHub上免费提供给学生，学者和研究社区，以供下载。