Mobile devices such as smartphones, e-readers, and watches are becoming ubiquitous in today’s world. Precise optical engineering is required to optimize the performance of mobile features such as the camera system, sensors, and the display. A key design objective for a mobile display is uniform...
Read MoreRPC Photonics has high quality BSDF measurement data available for their engineered diffuser products and it turns out that with a little help the data is essentially already prepared for use in FRED. The steps below describe how to use the attached FRED script to...
Read MoreA while ago, I was reading through Joe Geary’s excellent book, “Introduction to Lens Design” 1, and it occurred to me that his first order construction of a Cassegrain telescope could be very easily written up as a BASIC script in FRED. The example file that...
Read MoreSetting up a source as a lambertian emitter can be easily done in FRED using the Detailed Source model but often ends up being inefficient for raytracing because the collection optics subtend a small solid angle compared to the emission of the source. Often, however,...
Read MoreDuring a raytracing process, rays encounter surfaces that might have a combination of reflection, transmission, absorption and scatter properties that split the rays into various components. FRED allocates flux values to each ray by looking at these surface properties in a specific order. The user...
Read MoreIn this video we discuss how to assign an importance sample specification to multiple surfaces at once using FRED’s scripting language. #03 – FRED Technical Support Series from Ryan Irvin on Vimeo. ...
Read MoreAs of FRED v9.110, the BSDF plot routines ignore user-selection of “Apply on Reflection” or “Apply on Transmission”. For most scatter models there is no difference in the BSDF values and so there is no need for designation of a plot in transmission or reflection. ...
Read MoreThis knowledge base article describes a method of applying importance sampling specifications to a group of surfaces at once using FRED’s scripting language. Unlike sources, surfaces, coatings, materials, scatter models, ARN’s and raytrace control sets, scatter importance sampling specifications have no reference node on FRED’s...
Read MoreScatter Direction Regions of Interest are an integral part of an efficient scatter calculation, as they serve to direct scattered rays only towards areas of interest. In generating scattered rays, FRED evaluates the solid angle subtended by the Scatter Direction Region of Interest and handles...
Read MoreThis knowledge base article will describe how to create a Gaussian scatter distribution using FRED’s Scripted BSDF scatter model. This distribution is commonly used for simulating diffuser elements. scriptedGaussianScatter.pdf Download the FRED file: gaussianScatter_v9.110.frd...
Read More