Guide on How to Utilize Measured BSDF Data to Create a Scatter Model in FRED
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Guide on How to Utilize Measured BSDF Data to Create a Scatter Model in FRED

To utilize measured BSDF (Bidirectional Scattering Distribution Function) data and create a scatter model in FRED, follow these steps:

  • Navigate to the Tools folder in FRED.
  • Mouse over "BSDF data fitting" and select "Binomial/Polynomial data fitting."

  • Once you've accessed the fitting tool, proceed as follows:

  • Select your BSDF file. If you have a file prepared, such as one for diffuse black, open it.
  • For the selected BSDF file, change the type to "diffuse."
  • Set the fitting type to "regression fit" and define the parameters for N and M, typically ranging from two to three.

  • After configuring the fitting parameters, proceed with creating a perform fit:

  • Click on "Perform Fit," which generates multiple plots for each defined parameter.
  • Right-click on the plots to open and review them. These plots display the behavior of the BSDF function at each individual angle.

  • Once you've identified a suitable plot, follow these final steps to create the scatter model:

  • Highlight the preferred plot.
  • Navigate to the left-hand side and select "Create Model."
  • Close any unnecessary windows. You'll now see a fitted binomial model, created using the BSDF data file.
  • Right-click on the new scatterplot to explore various plotting options. For instance, you can select "angle linear" to visualize the behavior of each angle.
  • By following these steps, you can effectively utilize measured BSDF data to create a scatter model in FRED, enabling comprehensive analysis and modeling of scattering behavior. If you encounter any issues or have further questions, feel free to reach out to our support team at for assistance.