Rayfiles including spectral and colorimetric information

Area of Science:

• Optical Engineering
• Computer Graphics
• Photometry

Background:

• Accurate lighting simulations depend on realistic light source models.
• Traditional goniophotometers with V(λ)-filters are insufficient for light sources with angular color variations.
• Spectral information is crucial for advanced lighting simulations.

Purpose of the Study:

• To develop and validate a method for including spectral information of light sources in ray tracing simulations.
• To enhance the accuracy of lighting simulations for light sources with spatial or angular color variations.
• To enable precise spectral and color distribution calculations in ray tracing.

Main Methods:

• Measured angular spectral variations of an OLED using a spectroradiometer on a near-field goniophotometer.
• Applied Principal Component Analysis (PCA) for data reduction.
• Developed a method to construct monochromatic and tristimulus ray files from spectral measurements.
• Integrated these ray files into TracePro ray tracing software.

Main Results:

• Validated simulated absolute spectral irradiance against spectroradiometer measurements, showing good agreement.
• Generated accurate u'v'-color coordinate distributions on surfaces using tristimulus ray files.
• Demonstrated the effectiveness of the proposed method for spectral and color simulations.

Conclusions:

• The proposed method successfully incorporates spectral information into ray tracing for improved lighting simulations.
• This approach accurately predicts spectral and color distributions, essential for modern light sources.
• Offers a fast and efficient solution for enhancing simulation accuracy in optical engineering and computer graphics.