Torch Lens Maker

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Hello! I'm Victor, the author of this project.
I'm looking for funding to be able to keep working on it. If you can, please consider donating or sponsoring.
Thank you! ❤️

Light sources ​

Currently supported light sources:

  • RaySource: A single light ray. (Sampling dimensions: None)
  • PointSource: A point source on the kinematic chain. (Sampling dimensions: base)
  • PointSourceAtInfinity: A point source at infinity. (Sampling dimensions: base)
  • Object: A circular object on the kinematic chain. (Sampling dimensions: base, object)
  • ObjectAtInfinity: A circular object at infinity. (Sampling dimensions: base, object)
  • Wavelength: A virtual light source that adds wavelength data to existing non chromatic light rays. (Sampling dimensions: wavelength)

RaySource ​

A light source that emits a single ray of light. It does not need any sampling information.

python
import torchlensmaker as tlm

optics = tlm.Sequential(tlm.Turn([20, 0]), tlm.RaySource(material="air"))

tlm.show(optics, dim=2, end=40, sampling={})
tlm.show(optics, dim=3, end=40, sampling={})

PointSourceAtInfinity ​

A point light source "at infinity", meaning that the source is so far away that the rays it emits are perfecly parallel. The number of rays depends on the "base" sampling dimension along the source's beam diameter. The element's position on the kinematic chain represents the start point of the rays.

python
optics = tlm.Sequential(
    tlm.Gap(10),
    tlm.Rotate(
        tlm.PointSourceAtInfinity(beam_diameter=18.5),
        angles=(-15, -5),
    ),
    tlm.Gap(10),
    tlm.PointSourceAtInfinity(beam_diameter=18.5),
)

tlm.show2d(optics, end=40, sampling={"base": 30})
tlm.show3d(optics, end=40, sampling={"base": 50})

PointSource ​

A point source that's positioned in physical space by the kinematic chain. Rays are all emitted from the point source position and are sampled along the "base" dimension, within the domain defined by the beam angular size.

python
optics = tlm.Sequential(tlm.Gap(-10), tlm.Rotate(tlm.PointSource(10), [15, 0]))

tlm.show(optics, dim=2, end=30, sampling={"base": 10, "sampler": "random"})
tlm.show(optics, dim=3, end=100, sampling={"base": 100, "sampler": "random"})

ObjectAtInfinity ​

An object that's so far away that all light rays coming from the same position on the object are perfectly parallel. Emits light rays along both "base" and "object" sampling dimensions, within the domain defined by the beam diameter and the object angular size. The position of this optical element on the kinematic chain represents the start point of the rays.

python
optics = tlm.Sequential(
    tlm.ObjectAtInfinity(beam_diameter=10, angular_size=25),
    tlm.Gap(20),
    tlm.BiLens(
        tlm.Parabola(diameter=15, A=tlm.parameter(0.02)),
        material="BK7-nd",
        outer_thickness=1.0,
    ),
)

tlm.show2d(optics, end=50)
tlm.show3d(optics, end=200, sampling={"base": 20, "object": 20})

Object ​

An object that's positioned in physical space by the kinematic chain. Emits light rays along both "base" and "object" sampling dimensions, within the domain defined by the object diameter and the beam angular size.

python
surface = tlm.Parabola(diameter=15, A=tlm.parameter(0.02))
lens = tlm.BiLens(surface, material="BK7-nd", outer_thickness=1.0)

object_distance = 50

optics = tlm.Sequential(
    tlm.Gap(-object_distance),
    tlm.Object(beam_angular_size=5, object_diameter=5),
    tlm.Gap(object_distance),
    tlm.Gap(20),
    lens,
)

tlm.show(optics, dim=2, end=200)
tlm.show(optics, dim=3, end=200, sampling={"base": 10, "object": 10})

Wavelength ​

Adds a wavelength variable to existing rays. Duplicates existing light rays for each sampled wavelength value. Values are samples along the "wavelength" dimension, within the bounds defined by the object min and max arguments.

python
optics = tlm.Sequential(
    tlm.Gap(-1),
    tlm.PointSourceAtInfinity(beam_diameter=12),
    tlm.Gap(1),
    tlm.Wavelength(400, 800),
    tlm.BiLens(
        tlm.Parabola(diameter=15, A=tlm.parameter(0.02)),
        material="SF10",
        outer_thickness=1.0,
    ),
)

# As with other dimensions, configure the sampled wavelengths with the sampling dictionary
tlm.show2d(
    optics,
    end=5,
    sampling={"base": 10, "wavelength": 10},
    controls={"color_rays": "wavelength"},
)
tlm.show3d(
    optics,
    end=5,
    sampling={"base": 15, "wavelength": [400, 600, 600]},
    controls={"color_rays": "wavelength"},
)