FRED Knowledge Base

Gaussian Scatter Model

This 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...

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FRED v9.110 Released

FRED v9.110 was officially released on October 15, 2010 and contains some exciting new features that we believe make FRED more functional and easier to use.  Brief descriptions of these new features are provided below: Element Primitives Element Primitives are commonly used geometries which can be created...

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Customizing Charts

FRED uses a third-party chart control tool for the display and processing of visual data.  This chart control, a product of Component One, LLC, has a set of advanced settings and features which can be accessed and modified through FRED.  Additionally, there are two help...

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Irradiance vs. Spot Diagrams

Irradiance and Positions Spot Diagrams both make use of Analysis Surfaces. However, these functions treat ray data in distinctly different ways. This article provides illustrative examples of each. Irradiance vs. Spot Diagram...

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Multiple Ray Buffers

This article describes a suite of scripts which use ray buffers to collect rays on multiple surfaces. Once stored, rays can be recalled for analysis on a surface-by-surface basis. This functionality has application for such common tasks as generating spot diagrams on various elements, ghost...

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Saving Output Window Data to File

In instances where the user wishes to save information sent to FRED’s Output Window, simple script commands can be issued in the Text Input Command Line at the bottom of the application window. Saving Output Window Data to a File...

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Ray Ancestry

This article introduces the concept of ray ancestry as it applies to both specular and scattering events. The conventions associated with ancestry are illustrated graphically. Ray Ancestry...

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Ray Filtering

Ray filters provide a method for sorting through rays in the ray buffer and establishing a set of criteria which must be met in order for a ray to be included in the operation being performed.  Understanding how ray filters work is critical for verifying...

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Tabulated BSDF Data

In FRED, tabulated BSDF data can be applied in two ways: Direct import of a properly formatted data file as a scatter model, or Use of the BSDF Data Fitting Utility to generate an appropriate functional model Tabulated BSDF Data ...

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FRED v9.70 Released

Photon Engineering is proud to announce that FRED v9.70 is officially released for download. Major upgrades to this release include: 64-bit architecture [FRED Optimum only] Enhanced BASIC scripting language interactive development environment Source power unit specification in explicit photometric or radiometric units New photometric analyses...

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