- 3DLDF is a GNU package for three-dimensional drawing with MetaPost output. It is written in C++ using CWEB. It is intended, among other things, to provide a convenient way of including 3D graphics in TeX documents. This package includes an interactive program called `3dldf', which implements a language intended to resemble Donald Knuth's METAFONT language and John Hobby's MetaPost language, which is based on METAFONT.
- ADG: Automatic Drawing Generation
- The ADG library (Automatic Drawing Generation) is a set of functions focused on automating the drawing of mechanical parts. It is not a CAD system but a library providing a non-interactive canvas where you can put common CAD entities such as paths, xatches and quotes, to create your technical drawings. The final result can be displayed inside a GTK+ widget or exported to any cairo available format, such as PostScript and PDF documents or PNG and SVG images.
- 'Aalib' is a low level gfx library that works on any kind of terminal. It does not require graphics devices (in fact, no graphical output is possible), and is particularly useful for those with older hardware who do not want to worry about overloading their systems with graphical applications.
- 'Aewan' lets users create and edit ASCII art. Users move the cursor around with the arrow keys, "paint" characters by pressing the corresponding key, and choose foreground and background colors, and bold and blink attributes, with dialog boxes. They can also select, move, copy, and paste rectangular areas of the canvas. Aewan supports "intelligent" horizontal and vertical flipping (e.g., it converts "\" to "/", etc) and can work with multiple layers, turn transparency and visibility on and off for each layer, and change the order of the layers. Thus, each layer can be edited independently to generate a composite drawing. Layers can also be used as frames for an animation, thereby creating ASCII animations.
- Aqsis is a Renderman(tm) compliant 3D rendering toolkit. It is based on the Reyes rendering approach. Features include programmable shading, true displacements, NURBS, CSG, Motion Blur, and direct rendering of subdivision surfaces.
- Art of Illusion can be used as a 3D Modeller and can be used to create movies. It can currently import and export Alias .obj files and export VRML97 files (without animation). To create movies, Art of Illusion has a offline renderer and set of tools to create animations. Highlights include subdivision surface based modelling tools, skeleton based animation, and a graphical language for designing procedural textures and materials.
- 'Asymptote' is a script-based vector graphics language for technical drawing, inspired by MetaPost but with an improved C++-like syntax. It provides for figures the same high-quality level of typesetting that LaTeX does for scientific text. It is a programming language, not just a graphics program, so it can use the best features of both scripts and GUIs. High-level graphics commands are implemented in the language itself, so they can be tailored to specific applications. Labels and equations are typeset with LaTeX for high-quality PostScript output.
- Autotrace is a program which converts bitmap images to vector images. It can import images in BMP, TGA, PNM, PPM, PGM, PBM and those supported by ImageMagick, and can output Postscript, svg, xfig, swf, pstoedit, emf, dxf, cgm, mif, p2e and sk
- 'aview' is an high quality image (pnm) browser and animation (fli/flc) player which renders its output as ASCII-art. It is implemented using AA-lib.
- Ayam is a free 3D modelling environment for the RenderMan interface. Ayam features at a glance:
- RIB (RenderMan Interface Bytestream) export and import.
- Support for NURB curves and (trimmed) NURB surfaces, Boxes, Quadrics (Sphere, Disk, Cylinder, Cone, Hyperboloid, Paraboloid, and Torus), CSG, MetaBalls, Polygonal and Subdivision Meshes.
- NURBS modelling includes normal and interpolating curves as well as extrude, revolve, sweep, skin, gordon, and birail objects with caps, holes, and bevels.
- Custom objects that may freely implement their representations (using OpenGL and RIB) and even small GUIs to edit their type specific parameters may be written by the user and dynamically loaded at runtime.
- Scripting interface: Tcl.
- Miscellaneous: instancing, arbitrary number of modeling views, object clipboard, independent property clipboard, console, n-level undo.
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