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This post is a collection of tutorials on software packages for doing graphics in Python. The prerequisites to this post are a basic understanding of Python and the programming concepts behind graphics, such as coordinate systems and transformations. The two most popular modules in core graphics, NumPy and PIL (now Pillow), will be covered extensively. Then more advanced techniques like osgCV will be introduced. Finally, we'll talk about how you can combine different packages to create photo-realistic images using nothing more than Python code! What is the best free tool for creating 2D vector drawings? PDFLab (http://www.pdflab. org/) is free software with the goal of making the act of drawing in vector (X, Y) format fun and easy. It is currently under development, but it is very usable with Python 2.5 or 3.x (and probably also Python 2.4). Its use does not require any form of installation; people can simply install the PDFLab package through an easy-to-use setup script that is provided in its source code distribution (http://www10.software.ihep.ac.cn/~pdflab/). What is the best free tool for creating 3D models? Blender (http://www.blender. org/) is a free software that allows users to create 3D models by using Python scripting inside the built-in Python console or external Python programs. Blender's rendering engine uses OpenGL, which allows it to produce good-looking images on any platform. It also provides a way of importing meshes created with other 3D editing programs, such as Google Sketchup or Autocad. Additionally, Blender can also do some very interesting things with its built-in physics engine, but this has nothing to do with what you are learning in this series of articles... What is the best free tool for creating images (textures) that look realistic? OpenGLCheck (http://www.oglc.org/) is an open source tool that allows you to create images that look very realistic by using photos as your textures. It can be used both as a standalone program, or as a Python module. This tutorial will be using it to make images of the Pygo Zoo's wolves, but it can also be used for anything you want, including UI graphics like textures for buttons. How do I create vector images in OpenSCAD? ...The short answer is: "in OpenSCAD." The long answer is: "It depends. You can use the built-in 2D drawing functions of OpenSCAD, or you can import external vector graphics files." The choice of approach is entirely up to you. I prefer to use external SVG files, because it avoids the problem of "vectorizing" raster images. To embed an external SVG file, you simply place the following lines in your code: Why are there are so many different modules for creating 3D models? The answer to this question is complicated. First, NumPy provides functions for working with 3D arrays in its "ufuncs" module. Second, some people might prefer using KDN or Blender rather than some advanced Python module that gives them full control over what they are doing. eccc085e13
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