Photopia optical design software runs inside of Solidworks and Rhino, allowing optical engineers to design and analyze optical systems. Monte-carlo raytracing simulations ensure high accuracy, along with a fully modeled light source library and measured BSDF data for common materials. www.ltioptics.com

1. For SOLIDWORKS and Rhino
Optical Design Software

2. About Photopia
Photopia is optic design software used by optical engineers to virtually prototype the
performance of non-imaging optical systems before building physical prototypes.
Photopia’s monte-carlo raytracing engine works inside of Solidworks or Rhino and is
compatible with Inventor, Fusion, Catia, Creo, Pro/E and many other CAD softwares.
https://www.ltioptics.com/

3. About LTI Optics
LTI Optics is the company that creates and sells Photopia optical design software.
We are a small company located in Westminster Colorado supporting our software
around the entire globe.
Members of our team have been working on Photopia and its predecessor since the
1990’s, continually improving and refining our raytracing and optical design engines.
https://www.ltioptics.com/

4. Illumination – Light Guides – Optical Sensors
Some of the range of optical systems you can design and model with Photopia.

5. Photopia for SOLIDWORKS

6. Photopia for SOLIDWORKS

7. Photopia for SOLIDWORKS

8. Photopia for Rhino

9. True Color Modeling in Photopia

10. Modeling Spatial Spectral Emission Properties of LEDs

11. Simulation Accuracy - LED Collimator Lens
Photo of Actual Beam Image Photopia’s Simulated Beam Image

12. Parametric Free-Form Reflector Design Tools – Aiming &
Weighting Factors

13. Parametric Free-Form Lens Design Tools
Prismatic/Smooth, Profile Mapping, Aiming & Weighting

14. Parametric Lens Design Tools

15. Optimization Using Galapagos in Grasshopper
Multi-parameter genetic algorithm optimization in Rhino. Showing various designs
recorded along the progression, with beam angles getting closer to the desired 40°.

16. Smooth Spherical Lens Optics in SOLIDWORKS

17. Smooth Spherical Lens Optics in SOLIDWORKS

18. Aspherical Free-Form Lens Fit Tool
with Grasshopper VPL in Photopia for Rhino
Determine aspheric lens parameters for a free-form lens shape
using the Grasshopper VPL in Photopia for Rhino.

19. Lamp Library with Source Geometry & Optical Properties
Cree XHP-70 Model Geometry

20. Lamp Library with Source Geometry & Optical Properties
Cree XHP-70 Model Spectral Properties
Color Over Angle Variations

21. Photopia LED Geometry Based Source Models

22. Cree XP-L 3000K Color Lamp Model
Photopia LED Source Models
Geometry + Variable Spectrum Over Emission Angle

24. Photopia Source Library - LED Modules & Arrays

25. Photopia Source Library - LASERS
SLD Laser – phosphor
converted white
Osram – TO56
450nm laser diode
633nm HeNe laser

26. Model from Lumileds Website.
Rays emit from behind the chip and behind the entire emitter
package. LED geometry provided as a reference only.
Rays emit from actual LED geometry.
“Ray Set” Source Model for Rebel LED Photopia Source Model for Rebel LED
“Ray Set” Problems - Source Modeling

27. “Ray Set” Source Modeling Problems
Luxeon 3030 Midpower LED “Ray Set” from Lumileds Website

28. “Ray Set” Source Model Performance
Photopia Source Model Performance
Measured Ray Set Model Measured Ray Set Model
Measured Photopia Model Measured Photopia Model
Intensity Distribution Comparisons

29. “Ray Set” Source Model Performance Photopia Source Model Performance
Measured Measured
Ray Set Model Photopia Model
Intensity Distribution Comparisons

30. Physical and Simulated Views of
Bright View Technologies E0160PE7 Elliptical Anisotropic Diffuser
Laser shining through sample, about
30° from linear microstructure
orientation.
Simulation of laser through material at 4 orientations (0, 30, 60 & 90°) with
respect to the linear microstructure orientation. 2nd image matches image
from physical laser.
Material Scattering Via Measured BRDF/BTDF Data

31. Custom Built HDR Imaging Based BSDF Measurement Device

32. View of Camera & Screen on Rotating Ring
Custom Built HDR Imaging Based BSDF Measurement Device

33. Scatter Distributions Projected onto a Hemisphere
Some of the hemisphere needs to be filled in from surrounding data due to the
gap required to let the light source illuminate the sample.
Reflected data (BRDF). Transmitted data (BTDF). An additional
screen position can cover more of the
hemisphere when the light source is
below the table.
Custom Built HDR Imaging Based BSDF Measurement Device

34. View of BSDF Data from Glossy White Plastic
Spherical plot of relative intensity
distribution for 35° incidence angle.
Spherical plot of relative intensity
distribution for 40° incidence angle.

35. Particle Scattering Modeling for TiO2 in Acrylic

36. Particle Scattering Distributions
Particle scattering distribution from diffuse opaque
sphere.
Particle scattering from TiO2 in acrylic.

37. Volumetric Scattering in Refractor Materials
with Spectral Conversion (Phosphor modeling)
Blue laser directed into a light guide
with a low density of phosphor
particles.
Blue laser directed a into light guide
with a medium density of phosphor
particles.
Blue laser directed into a light guide
with a high density of phosphor
particles.

38. OptiColor PMMA & PC Diffusers with Variable % Loading
A wide range of diffuser loading percentages have been modeled for
various grades of PMMA & PC from OptiColor

39. LED Package Design
LED Emitter
Phosphor Infused Silicone
Modeling Phosphor Converted White LEDs Using Blue LED Emitting
into Phosphor Infused Silicone Using Volumetric Scattering

40. Luminous & Spectral Performance of Mid-
Power LED Package
LED Package Cross Section
Emission Face View
Lamp model based on blue LED and phosphor infused silicone. Raytrace is modeling
the scattering and wavelength conversion of the phosphor particles.

41. Headlight Projector Lens with Dynamic Beam Control

42. Headlight Projector Lens with Dynamic Beam Control

43. Headlight Projector Lens with Dynamic Beam Control

44. Automotive Output – Type A Intensity Distribution

45. LED Headlight Reflectors
Upper Half - Low Beam Reflector
Lower Half - High Beam Reflector
Reflectors Designed in Rhino

46. LED Headlight Reflectors
Low beam uses a 5 chip 6000K Samsung LED package
High beam uses a 4 chip 6000K Samsung LED package

47. Beam Projections on a Vertical Plane
Low Beam + High Beam
Low Beam High Beam
Sample beams, not fully compliant.

48. H+L Beam Luminous Views
6 viewing angles were run in a single simulation, separated by 10° rotations horizontally and
vertically. The projected images are upside down from the reflector orientation, so the lower
part in the image is the upper reflector for the low beam.

49. H+L Beam Luminous View at H0 V0
Rhino’s standard shaded view on the left and the photometrically accurate luminous view on
the right based on the image projection.

50. H+L Beam Luminous View at H-10 V0
Rhino’s standard shaded view on the left and the photometrically accurate luminous view on
the right based on the image projection.

51. H+L Beam Luminous View at H-20 V0
Rhino’s standard shaded view on the left and the photometrically accurate luminous view on
the right based on the image projection.

53. UVC Irradiation Simulations of Optical Devices
in Application Environments
UVC LED device irradiating high touch areas of an
ultrasound machine.
UVC low pressure mercury lamp robot irradiating an exam room.

54. UVC Fluence Simulations of Air Particles in Duct
Fluence rate grids placed along the air duct. The Total Fluence report computes the total
integrated fluence over the duct cross section based on the user input air speed.

55. Designs for 3D Printed Reflectors
from Photopia for Rhino & Grasshopper
Fully parameterized Voronoi pattern holes applied to a
PODT generated reflector using Grasshopper in
Photopia for Rhino.
Light pattern produced by reflector with diffuse white finish
and RGB LEDs inside. Light is mixed in the beam center, but
colors offset as they exit through holes in slightly different
directions.

56. Chair Model Illuminated by Voronoi Cell Reflector
Using Object Recorders in Photopia for Rhino
Larger Voronoi reflector lighting up a chair in the corner of a
room.
Gray scale image showing the lux levels on the object.
Chair design by Max Jongewaard.

57. Quantitative Photometric and Colorimetric Output Options
False color plot showing the lux levels on the object. Delta u’v’ plot, showing color differences from the average
color in the scene. Dark means the color at that point is close
to the average, brighter green is further from the average.
0.001 in the uniform u’v’ color space is a just noticeable color
difference. 0.001 is equivalent to 1 MacAdam ellipse.
Chair design by Max Jongewaard.

58. Computational Optical Geometry Generation with
Grasshopper in Photopia for Rhino
A light guide extraction feature design tool patterns any
extraction feature geometry across any NURBS surface.
The feature density and rate of size change is user
defined.
Design tool produces curved facets for any revolved
reflector or lens surface. User defined inputs for the # of
facets around the circumference, horizontal and vertical
curvature and the draft angle, which limits vertical
curvature to avoid part undercuts.

59. Light Guide Extraction Feature Generation
with Grasshopper in Photopia for Rhino
A light guide extraction feature design tool allows any extraction feature geometry to
be arrayed across any NURBS surface. User defined feature density and rate of
feature size changes.

60. Modeling Underwater Lighting Effects
Pool model with 3 LED lights, spectral water properties & air/water interface at the surface.

61. Modeling Underwater Lighting Effects
Top perspective view of pool to see all color mixing effects.

62. Modeling Underwater Lighting Effects
Quantitative results with false color plot showing lux levels in the pool.

63. Modeling Underwater Lighting Effects
Quantitative results with gray scale plot showing lux levels in the pool.

64. Modeling Automotive Interior Lighting
Quantitative results show lux levels on car seat from dome light.

65. Automotive Interior Lighting – False Color
Illuminance onto Driver’s Seat
Isolating seat to show lux levels from LED dome light.

66. Automotive Interior Lighting – Appearance with
Spectral Reflectance
True color illuminance onto seat from 4000K LED.
True color exitance reflected off seat from 4000K
LED and spectral reflectance of slate gray main
seat with cherry red cushion & logo.

67. Luminaire Luminous Images
CAD model showing the housing, PCB, LED array and diffuser in Rhino.
LED Nichia 757 V1 2700K
LED Layout 4x4 Array, 25mm Spacing
Lens
Bright View Circular 80°
10mm in front of LED emission surface
125mm x 125mm
Reflector Materials White Optics F16.4, white PCB

68. Luminous Image Model Configuration
View of simulation model for a luminous image. A smooth spherical convex lens and aperture are placed between
the optic and the image projection plane.
Luminaire
Convex Lens
Aperture
Image
Projection Plane

69. Images of Diffuser on Image Plane
True color image.
False color image showing lux values on projection
plane. Values are proportional to luminance and
can be converted to luminance via a scale factor
based on the lens system F-number.

70. Color Uniformity Evaluation Across Diffuser
“Delta u’v’ from average” plot of the image
projection plane. This plot shows the color
variation over the diffuser surface. 0.001 is
1 MacAdam ellipse.
True color image.

71. Tunable White Design Color Uniformity Evaluation
True color image. Subtle color
variations are seen around the
beam perimeter. LED array uses
7 2700K and 7 5000K LEDs.
“Delta u’v’ from average” plot of illuminance plane. This plot shows
the quantitative color variation over the plane. In this color space,
0.001 is 1 MacAdam ellipse. Perimeter color variations are now
very clearly identified.

72. Tunable White Design Color Uniformity Evaluation
True color image with improved color mixing
features in the optic.
Distinct color differences around the perimeter are
gone and there is now just a smooth color gradient
from the center outward.

73. Medical Illumination / Irradiation / Color Uniformity
Exitance off object.
Illuminance onto object.

74. Desk Lamp Luminous Views
Detailed light pattern onto desk and shade surface from a 4 “filament” LED A-lamp with surrounding cage. The shadows are all due
to the 4 individual filaments being blocked by the various bars of the cage. Images were created using “object recorders” in Rhino.
Note that the A-lamp appearance is shown via Rhino’s standard ghosted shaded view.

75. Accurate “Near-Field” Effects
This wall grazer design is intended to be mounted so that it nearly touches the wall being lit. “Far-field” photometry does not adequately quantify
the way this luminaire will interact with the wall. The 3D rays within and emitting from the luminaire model in Photopia precisely describe the light
field it produces. Surfaces can therefore be placed anywhere, including within the luminaire, to see how the light interacts with those surfaces.

76. Passive Infrared (PIR) Motion Detector Sensor Lens
Simulation
2 Element Sensor Optical
Model
Array of Fresnel lens features aimed toward different regions of the field of view. 4
sensor elements setup to emit red & green light to confirm their beams minimally
overlap.