The hint() function is available for advanced users to modify details about how geometry is drawn to the screen. These options are only available on graphics cards that support them and may slow a program down or require more memory. The optional parameters from low to high are 2, 4, and 8, with 2 as the default. For instance, smooth(4) will enhance the quality of anti-aliasing to improve the image quality. The visual quality of the OpenGL renderers, P2D and P3D, can be adjusted with the smooth() and hint() functions.Īll programs have smoothing enabled by default, but an optional parameter to smooth() can improve the quality of the OpenGL rendering with P2D and P3D. Both P2D and P3D utilize a software specification called OpenGL that is supported on many GPUs (the Graphics Processing Unit on a computer’s graphics card) to accelerate drawing. The P2D renderer is an alternative 2D renderer that is substantially faster than the default renderer for most tasks, but it sacrifices some visual quality for speed. The P3D renderer for drawing in three dimensions is discussed in the 3D Drawing chapter (p. It’s used when one of the other renders aren’t defined as the third parameter to size(). The default renderer is used for the majority of the programs in this book it’s for 2D drawing. Processing has three primary renderers: the default renderer, P3D, and P2D. The content that follows is tailored for printing at home or working with a vendor to produce small editions. The industry surrounding digital printing is full of trademarked names and buzzwords, so this text aspires to demystify some of the terminology and provide pointers to additional information. It presents examples of software written to produce print output, and discusses a few common contemporary print technologies. This short text provides a brief history of the digital printing technologies that have led to these new techniques. Before the discussion moves to multiple drawing surfaces, this chapter starts with a discussion of the different renderers used by Processing. Similarly, drawing surfaces in Processing can be moved around, drawn using blending effects and transparency, and drawn in different orders to change how the layers combine. This technique makes it easier to imagine a program as a stack of layers similar to the technique used in photo editing and vector drawing software. All of the drawing features available in the display window can be applied to an offscreen drawing surface and then drawn back into the display window as an image or texture. Sometimes, however, there is an advantage in drawing to another graphics surface. If you see any errors or have comments, please let us know.īy default, everything is drawn to the primary display window. coordinate division etc.This tutorial is the Render Techniques chapter from Processing: A Programming Handbook for Visual Designers and Artists, Second Edition, published by MIT Press. If you choose an autocollimator or testing telescope with 90° viewing and reticles with lettering (e.g. If the focal length of the objective lens is greater than 300 mm or, for example, a small mirror diameter leads to a strong stop down, reticles with larger line widths are recommended due to the better contrast ratio. Please note therefore the examples of application for the different reticles or contact us. Not all reticles can be used as the eyepiece and collimator reticle. Please review the following to aid in correct reticle selection for your specific application: The clear aperture of reticles used in collimators or telescopes is always 10 mm. One exception are autocollimators with reticle turret. The clear aperture of a reticle used at the illuminated side of an autocollimator is 6 mm and at the eyepiece side 10 mm.
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