OptSys

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First order ray-optical system simulation

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OptSys -- Optical systems simulator

# About
Simulate ray-tracing of optical system with first order approximation. This will
 be a handy tool to get an intial estimate for various components for your
 optical system.

# Components
The following components can be used:

* **Lens**: Convex/concave lens with finite aperture. Uses lens maker's formula for
computing output ray

* **SphericalMirror**: Concave/convex mirror with finite aperture. Uses lens maker's formula for computing output ray

* **Mirror**: Flat mirror with finite aperture.

* **Grating**: Diffraction grating with set number of groves and finite aperture.
As of now, only fixed order is supported.

* **DMD**: Digital Micromirror device with zero pitch size and finite aperture.

* **Sensor**: Image sensor which halts all ray propagation. Use it as image plane.

# Extra functions
Apart from placement and viewing of optical elements and rays, you can also:

1. Compute the light throughput of the system

2. Compute vingetting for the scene for a given system

3. Simulate system for different wavelengths

# Usage
Broadly, simulation consists of two parts

* **Components**: A (python) list of various optical components with component
specific paramenter, position, aperture and angle w.r.t y-axis. An example:
```python
import raytracing as rt

components = []
components.append(rt.Lens(f=100,
			  aperture=25.4,
			  pos=[0,0],
			  theta=0))
```

* **Rays**: A (python) list of 3-tuple of rays with x-coordinate, y-coordinate
and angle w.r.t x-axis. An example:
```python
import raytracing as rt

rays = []
rays.append([-10, 0, -np.pi/6])
```

Once you configure your system with components and rays, you can propagate the
rays using the following command:
```python
ray_bundles = propagate_rays(components, rays)

```

In order to view the output, you create a canvas and draw the components and
rays.
```python
import visualize as vis

# Color for the rays
colors = 'r'

# Create a new canvas
canvas = vis.Canvas([-200, 600], [-100, 100])

# Draw the components
canvas.draw_components(components)

# Draw the rays
canvas.draw_rays(ray_bundles, colors)

# Show the system
canvas.show()

# Save a copy
canvas.save('example.png')
```

See examples folder for more information.

# Other modules
**lf_2d.py** : Includes several functions for simulation of 2D lightfields

**lf_4d.py**: Includes several functions for manipulating 4D lightfields

# TODO
- [ ] Redo all examples with updated functions
- [x] Implement convex/concave mirror
- [ ] Implement thin prism
- [ ] Implement image plane computation
- [ ] Implement field lens optimization
- [ ] Replace numpy commands with pytorch to enable SGD-based optimization

**Authors**:
*	Vishwanath Saragadam (Postdoc, Rice University)
*	Aswin Sankaranarayanan (Professor, ECE, Carnegie Mellon University)

OptSys

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