ZEMAX Users' Knowledge Base - Articles - Sources, Splitting and Scattering

How to Use Tabular BSDF Data to Define the Surface Scattering Distribution

no@spam.com (Sanjay Gangadhara) — Fri, 02 May 2008 11:00:00 PDT

This article explains how measured BSDF data may be used to define the scattering properties of a surface. An example using BSDF data measured by the Imaging Sphere for Scatter and Appearance, which has been developed by Radiant Imaging, is provided.

BSDF Data Interchange File Format Specification

no@spam.com (Ron Rykowski) — Fri, 02 May 2008 11:00:00 PDT

This article describes the BSDF Data Interchange file format, as developed by Radiant Imaging, Inc. This file format is required for the user-defined scattering function RI_BSDF.DLL, which is used to apply a scattering distribution as provided by tabular BSDF data on a non-sequential surface.

Bulk Scattering with the Rayleigh Model

no@spam.com (Sanjay Gangadhara) — Fri, 02 May 2008 10:30:00 PDT

This article illustrates use of the Rayleigh distribution to model bulk scattering.

How to Create a User-Defined Scattering Function

no@spam.com (Sanjay Gangadhara) — Thu, 21 Feb 2008 00:00:00 PST

This article explains how to write a DLL for a user-defined scattering function. An example of a Gaussian X-Y probability function is given.

Using the Henyey-Greenstein Distribution to Model Bulk Scattering

no@spam.com (Sanjay Gangadhara) — Mon, 21 Jan 2008 00:00:00 PST

This article illustrates use of the Henyey-Greenstein distribution to model bulk scattering.

How to Write User-Defined Sources and Scatter Functions in Fortran

no@spam.com (Jeff Casey) — Mon, 10 Dec 2007 00:00:00 PST

User-defined objects, scatter functions, sources etc are dll programs that communicate with ZEMAX. In this article I show how to write such programs in Fortran. Sample code is provided.

How to Model Scattering Efficiently

no@spam.com (Akash Arora) — Mon, 15 Oct 2007 00:00:00 PDT

ZEMAX has two features that improve scattering efficiency: Scatter To and Importance Sampling. In this article we discuss the details of each and perform a stray light analysis using importance sampling.

How to Make Any Object into a Source Object

no@spam.com (Michael Pate) — Sat, 20 Jan 2007 00:00:00 PST

This article describes how to create sources of any geometrical size and shape. The Source Object provides the flexibility to convert any object into a source, including any imported CAD object.

Understanding Sobol Sampling

no@spam.com (Mark Nicholson) — Thu, 10 Nov 2005 00:00:00 PST

This article explains

What Sobol sampling is,
What its benefits are over random ray-generation methods
What its limitations are

This article is also available in Japanese.

What is Simple Splitting?

no@spam.com (Mark Nicholson) — Mon, 07 Nov 2005 00:00:00 PST

This article explains:

What "simple splitting" is
When to use it