Routine refractions.
نویسندگان
چکیده
منابع مشابه
Reflections on Refractions
In computer graphics, it is often an advantage to calculate refractions directly, especially when the application is time-critical or when line graphics have to be displayed. We specify efficient formulas and parametric equations for the refraction on straight lines and planes. Furthermore, we develop a general theory of refractions, with reflections as a special case. In the plane case, all re...
متن کاملRefractions and Reflections
Dynamic retinoscopy is a well described but often overlooked technique that allows rapid assessment of accommodative ability. The key to the technique is the neutralization of the retinoscopic reflex that occurs when the patient accommodates on a target adjacent to the retinoscope. This clinical tool can provide critical data that can help solve treatment dilemmas, such as when a child presents...
متن کاملPipeline Rendering:interactive Refractions, Reeections, and Shadows
A coordinated use of hardware-provided bitplanes and rendering pipelines can create ray-trace quality illumination eeects in real-time. We provide recursive re-ections through the use of secondary viewpoints, and present a method for using a homogeneous 2-D projec-tive image mapping to extend this method for refractive surfaces. We extend the traditional use of shadow volumes to provide reeecte...
متن کاملLight Field Techniques for Reflections and Refractions
Reflections and refractions are important visual effects that have long been considered too costly for interactive applications. Although most contemporary graphics hardware supports reflections off curved surfaces in the form of environment maps, refractions in thick, solid objects cannot be handled with this approach, and the simplifying assumptions of environment maps also produce visible ar...
متن کاملReflections and Refractions in Ray Tracing
When writing a ray tracer, sooner or later you’ll stumble on the problem of reflection and transmission. To visualize mirror-like objects, you need to reflect your viewing rays. To simulate a lens, you need refraction. While most people have heard of the law of reflection and Snell’s law, they often have difficulties with actually calculating the direction vectors of the reflected and refracted...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: BMJ
سال: 1971
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.3.5772.477-c