*

Assets/Scenes.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 692446ebfc8bf4745ad1f5c2e34061b3
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scenes/CircleSurface.cs

@@ -0,0 +1,44 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class CircleSurface : OpticalSurface2D
+{
+
+    public float Radius;
+    public int ViewSamples = 15;
+
+    void Start()
+    {
+        
+    }
+
+    void Update()
+    {
+        
+    }
+
+    private void OnValidate() {
+        Shape = PointsToLines(GetGeometry(), true);
+    }
+
+    private Vector2[] GetGeometry() {
+        Vector2[] result = new Vector2[ViewSamples];
+        float da = Mathf.PI * 2 / ViewSamples;
+        for (int i = 0; i < ViewSamples; i++) {
+            float angle = da * i;
+            result[i] = new Vector2(Mathf.Cos(angle) * Radius, Mathf.Sin(angle) * Radius);
+        }
+        return result;
+    }
+
+    public override bool Raycast(Ray2D ray, ref RaycastMath.RaycastResult2D result) {
+        var localSpaceRay = new Ray2D( transform.InverseTransformPoint(ray.origin), transform.InverseTransformVector(ray.direction).normalized);
+        if (RaycastMath.RaycastCircle(localSpaceRay, Radius, ref result)) {
+            result.Point = transform.TransformPoint(result.Point);
+            result.Normal = transform.worldToLocalMatrix.MultiplyVector(result.Normal).normalized;
+            return true;
+        }
+        return false;
+    }
+}

Assets/Scenes/CircleSurface.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ae0b3433277d89248a6658e589b07b2e

Assets/Scenes/OpticalSurface2D.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public abstract class OpticalSurface2D : MonoBehaviour
+{
+    [Serializable]
+    public struct Line {
+        public Vector2 P1;
+        public Vector2 P2;
+    }
+
+    public Line[] Shape;
+
+
+
+    public abstract bool Raycast(Ray2D ray, ref RaycastMath.RaycastResult2D result);
+
+    public static Line[] PointsToLines(Vector2[] points, bool closed) {
+        Line[] result = new Line[points.Length - (closed ? 0 : 1)];
+
+        for (int i = 0; i < points.Length - 1; i++) {
+            result[i] = new Line() { P1 = points[i], P2 = points[i + 1] };
+        }
+
+        if (closed) {
+            result[result.Length - 1] = new Line() { P1 = result[result.Length - 2].P2, P2 = result[0].P1 };
+        }
+
+        return result;
+    }
+
+
+    private void OnDrawGizmos() {
+        if (Shape == null) return;
+        if (Shape.Length < 1) return;
+
+        Gizmos.matrix = transform.localToWorldMatrix;
+        for (int i = 0; i < Shape.Length; i++) {
+
+            Gizmos.DrawLine(Shape[i].P1, Shape[i].P2);
+        }
+        Gizmos.matrix = Matrix4x4.identity;
+    }
+}

Assets/Scenes/OpticalSurface2D.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 2f6f4ffaf4e813543831f8b6fb081aef

Assets/Scenes/PlanoConvexLens.cs

@@ -0,0 +1,162 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+public class PlanoConvexLens : OpticalSurface2D
+{
+    public float LensRadius = 1.0f;
+    public float CurveRadius = 1.0f;
+    public int SamplesCount = 10;
+    public float Height = 0.1f;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+
+    private RaycastMath.RaycastResult2D[] _raycasts;
+
+    public override bool Raycast(Ray2D ray, ref RaycastMath.RaycastResult2D result) {
+        if(_raycasts == null) {
+            _raycasts = new RaycastMath.RaycastResult2D[4];
+        }
+
+        var localSpaceRay = ray;
+        localSpaceRay.origin = transform.InverseTransformPoint(localSpaceRay.origin);
+        localSpaceRay.direction = transform.InverseTransformVector(localSpaceRay.direction).normalized;
+
+        //cs = as + bs
+        //bs = cs - as
+
+
+        float h = Mathf.Sqrt(CurveRadius * CurveRadius - LensRadius * LensRadius);
+
+
+        var sphereCastRay = localSpaceRay;
+        sphereCastRay.origin += Vector2.up *  (Mathf.Sign(CurveRadius) * h - Height);
+
+        int raycastsCount = 0;
+
+        bool curveIntersected = RaycastMath.RaycastCircle(sphereCastRay, Mathf.Abs( CurveRadius), ref _raycasts[raycastsCount]);
+        if (curveIntersected) {
+            _raycasts[raycastsCount].Point += Vector2.down * Mathf.Sign(CurveRadius) * (h);
+
+            if(CurveRadius >= 0) {
+                if (_raycasts[raycastsCount].Point.y < 0) {
+                    curveIntersected = false;
+                } else {
+                    _raycasts[raycastsCount].Point += Vector2.up * Height;
+                    raycastsCount++;
+                }
+            } else {
+                if (_raycasts[raycastsCount].Point.y > 0) {
+                    curveIntersected = false;
+                } else {
+                    _raycasts[raycastsCount].Point += Vector2.up * Height;
+                    _raycasts[raycastsCount].Normal = -_raycasts[raycastsCount].Normal;
+                    raycastsCount++;
+                }
+            }
+           
+        }
+
+
+        Vector2 leftHitPoint = Vector2.zero;
+        if(Height > 0.0f && RaycastMath.RayLineSegmentIntersection(localSpaceRay.origin, localSpaceRay.direction, new Vector2(-LensRadius, 0), new Vector2(-LensRadius, Height), ref leftHitPoint)) {
+            _raycasts[raycastsCount].Normal = Vector2.left;
+            _raycasts[raycastsCount].Point = leftHitPoint;
+            raycastsCount++;
+        }
+
+        Vector2 rightHitPoint = Vector2.zero;
+        if(Height > 0.0f && RaycastMath.RayLineSegmentIntersection(localSpaceRay.origin, localSpaceRay.direction, new Vector2(LensRadius, 0), new Vector2(LensRadius, Height), ref rightHitPoint)) {
+            _raycasts[raycastsCount].Normal = Vector2.right;
+            _raycasts[raycastsCount].Point = rightHitPoint;
+            raycastsCount++;
+        }
+
+        Vector2 bottomHitPoint = Vector2.zero;
+        if(LensRadius > 0.0f && RaycastMath.RayLineSegmentIntersection(localSpaceRay.origin, localSpaceRay.direction, new Vector2(-LensRadius, 0), new Vector2(LensRadius, 0), ref bottomHitPoint)) {
+            _raycasts[raycastsCount].Normal = Vector2.down;
+            _raycasts[raycastsCount].Point = bottomHitPoint;
+            raycastsCount++;
+        }
+
+
+        if(raycastsCount == 0) {
+            return false;
+        }
+
+        result = _raycasts.Take(raycastsCount).OrderBy(x => Vector2.Distance(x.Point, localSpaceRay.origin)).First();
+
+        result.Point = transform.TransformPoint(result.Point);
+        result.Normal = transform.InverseTransformVector(result.Normal).normalized;
+
+        return true;
+    }
+
+    private void OnValidate() {
+
+        if(CurveRadius > 0 && CurveRadius < LensRadius) {
+            CurveRadius = LensRadius;   
+        }
+
+        if (CurveRadius < 0 && CurveRadius > -LensRadius) {
+            CurveRadius = -LensRadius;
+        }
+
+        var points = RadialCurve(LensRadius, CurveRadius, SamplesCount);
+        if(points.Length < 2) {
+            return;
+        }
+
+        Shape = new Line[points.Length - 1 + 3];
+
+        for(int i = 0; i < points.Length - 1; i++) {
+            Shape[i] = new Line() { P1 = points[i] + Vector2.up * Height, P2 = points[i + 1] + Vector2.up * Height };
+        }
+
+        Vector2 p1 = new Vector2(-LensRadius, Height);
+        Vector2 p2 = new Vector2(-LensRadius, 0);
+        Vector2 p3 = new Vector2(LensRadius, 0);
+        Vector2 p4 = new Vector2(LensRadius, Height);
+
+        Shape[Shape.Length - 3] = new Line() { P1 = p1, P2 = p2 };
+        Shape[Shape.Length - 2] = new Line() { P1 = p2, P2 = p3 };
+        Shape[Shape.Length - 1] = new Line() { P1 = p3, P2 = p4 };
+    }
+
+
+    public static Vector2[] RadialCurve(float lenseRadius, float curveRadius, int samplesCount) {
+
+
+        //r*r = x*x + h*h
+        //h*h = r*r - x*x
+
+        Vector2[] result = new Vector2[samplesCount];
+
+        float h = Mathf.Sqrt(curveRadius * curveRadius - lenseRadius * lenseRadius);
+
+        float dx = (-2.0f * lenseRadius) / (samplesCount - 1);
+
+        for (int i = 0; i < samplesCount; i++) {
+            float x2 = lenseRadius + dx * i;
+            float h2 = Mathf.Sqrt(curveRadius * curveRadius - x2 * x2);
+
+         
+            result[i] = new Vector2(x2, Mathf.Sign(curveRadius) *  (h2 - h));
+       
+            
+        }
+
+        return result;
+    }
+}

Assets/Scenes/PlanoConvexLens.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d9a5a27b20e512840a47158afe4a4e7f

Assets/Scenes/PointLight.cs

@@ -0,0 +1,67 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class PointLight : MonoBehaviour
+{
+    public int SamplesCount = 5;
+    public float Angle = 45.0f;
+
+
+
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+
+   
+    public Ray2D[] GetRays() {
+        float angleRad = Mathf.Deg2Rad * Angle;
+        float halfAngleRad = angleRad / 2.0f;
+
+        if(SamplesCount == 1) {
+            halfAngleRad = 0;
+        }
+
+        float startAngle = 2.5f * Mathf.PI - halfAngleRad;
+        float endAngle = 2.5f * Mathf.PI + halfAngleRad;
+
+        Ray2D[] result = new Ray2D[SamplesCount];
+
+        float step = angleRad / (SamplesCount - 1);
+
+        if (SamplesCount > 1) {
+            for (int i = 0; i < SamplesCount; i++) {
+                float a = startAngle + step * i;
+                result[i] = new Ray2D(transform.position, transform.TransformVector(new Vector3(Mathf.Cos(a), Mathf.Sin(a), 0.0f)).normalized);
+            }
+        } else {
+            result[0] = new Ray2D(transform.position, transform.TransformVector( new Vector3(Mathf.Cos(startAngle), Mathf.Sin(startAngle), 0.0f)).normalized);
+        }
+
+        return result;
+    }
+
+
+
+    public bool DrawGizmo = true;
+    private void OnDrawGizmos() {
+        if (!DrawGizmo) {
+            return;
+        }
+        var rays = GetRays();
+
+        foreach (var ray in rays) {
+            Gizmos.DrawLine(ray.origin, ray.origin + ray.direction * 0.5f);
+        }
+
+    }
+}

Assets/Scenes/PointLight.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d1f035f4ba278b7419c3b3565780f203

Assets/Scenes/RaycastMath.cs

@@ -0,0 +1,82 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using static OpticalSurface2D;
+
+public class RaycastMath
+{
+    public struct RaycastResult2D {
+        public Vector2 Point;
+        public Vector2 Normal;
+    }
+
+    public static bool RaycastCircle(Ray2D ray, float radius, ref RaycastResult2D result) {
+        var vToCircleCenter = Vector2.zero - ray.origin;
+
+        bool isInsideCircle = vToCircleCenter.magnitude < radius;
+
+        var d = Vector2.Dot(vToCircleCenter, ray.direction.normalized);
+
+
+        if(d < 0 && ray.origin.magnitude > radius) {
+            return false;
+        }
+
+        var p = ray.origin + ray.direction.normalized * d;
+
+        var v = Vector2.zero - p;
+
+        var rayCenterDistance = v.magnitude;
+        if (rayCenterDistance > radius) {
+            return false;
+        } else if (rayCenterDistance == radius) {
+            result.Point = p;
+            result.Normal = p.normalized;
+        } else {
+
+            float m = Mathf.Sqrt(radius * radius - rayCenterDistance * rayCenterDistance);
+
+            if (isInsideCircle) {
+                result.Point = p + ray.direction.normalized * m;
+                result.Normal = result.Point.normalized;
+            } else {
+                result.Point = p - ray.direction.normalized * m;
+                result.Normal = result.Point.normalized;
+            }
+        }
+        return true;
+    }
+
+
+    public static bool RayLineIntersection(Vector2 rayOrigin, Vector2 rayDirection, Vector2 lineOrigin, Vector2 lineDirection, ref Vector2 hitPoint) {
+        Vector2 rayTangent = new Vector2(-rayDirection.y, rayDirection.x);
+
+        float distanceToLine = Vector2.Dot(lineOrigin - rayOrigin, rayTangent);
+        float origin2ExtensionDistance = distanceToLine / Vector2.Dot(-rayTangent, lineDirection);
+        hitPoint = origin2ExtensionDistance * lineDirection + lineOrigin;
+
+        return Vector2.Dot(hitPoint - rayOrigin, rayDirection) > 0.0f;
+    }
+
+    public static bool RayLineSegmentIntersection(Vector2 rayOrigin, Vector2 rayDirection, Vector2 lineOrigin, Vector2 lineP2, ref Vector2 hitPoint) {
+        Vector2 rayTangent = new Vector2(-rayDirection.y, rayDirection.x);
+
+        Vector2 lineDirection = lineP2 - lineOrigin;
+
+
+        float distanceToLine = Vector2.Dot(lineOrigin - rayOrigin, rayTangent);
+        float origin2ExtensionDistance = distanceToLine / Vector2.Dot(-rayTangent, lineDirection);
+        hitPoint = origin2ExtensionDistance * lineDirection + lineOrigin;
+
+        if (Vector2.Dot(hitPoint - rayOrigin, rayDirection) < 0.0f) {
+            return false;
+        }
+
+        var d = Vector2.Dot(hitPoint - lineOrigin, lineDirection.normalized);
+        if (d < 0.0f || d > lineDirection.magnitude) {
+            return false;
+        }
+
+        return true;
+    }
+}

Assets/Scenes/RaycastMath.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 70197946adeea59448794e3fdf65586d

Assets/Scenes/Raytracer2D.cs

@@ -0,0 +1,225 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.Windows;
+
+public class Raytracer2D : MonoBehaviour
+{
+
+    public PointLight Light;
+    public OpticalSurface2D[] Surfaces;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+    }
+
+    
+
+
+
+    bool NearestIntersection(Vector2 rayOrigin, Vector2 rayDir, OpticalSurface2D.Line[] lines, int excludeLineIndex, ref int lineIndex, ref Vector2 intersectionPoint) {
+        Dictionary<int, Vector2> intersections = new Dictionary<int, Vector2>();
+        Vector2 hitPoint = new Vector2();
+        for (int i = 0; i < lines.Length; i++) {
+            if(i != excludeLineIndex) {
+                var l = lines[i];
+                if (RaycastMath.RayLineSegmentIntersection(rayOrigin, rayDir, l.P1, l.P2, ref hitPoint)) {
+                    intersections.Add(i, hitPoint);
+                }
+            }
+           
+        }
+
+        if(intersections.Count == 0) {
+            return false;
+        }
+
+        var result = intersections.OrderBy(x => Vector2.Distance(rayOrigin, x.Value)).First();
+        lineIndex = result.Key;
+        intersectionPoint = result.Value;
+        return true;
+    }
+
+
+    Vector2 Perpendicular(Vector2 vector) {
+        return new Vector2(vector.y, -vector.x);
+    }
+
+    Vector2 Reflect(Vector2 vector, Vector2 reflectionVector) {
+        var l = Vector2.Dot(reflectionVector, vector );
+        var p = reflectionVector * l;
+        var p2 = p - vector;
+        return p + p2;
+
+    }
+
+    bool Refract(Vector2 incident, Vector2 normal, float n1, float n2, out Vector2 result) {
+
+        //Snell's law:   n1*sin(theta1) = n2*sin(theta2)
+
+        //n1/n2 = sin(theta2) / sin(theta1)
+
+        
+        //ior = sin(theta2) / sin(theta1)
+        //sin(theta2) = ior * sin(theta1)
+
+
+        float cosTheta1 = Vector2.Dot(incident, normal);
+
+        if(cosTheta1 < 0) {
+            cosTheta1 = -cosTheta1;
+        } else {
+        
+            normal = -normal;
+            var tmp = n1;
+            n1 = n2; n2 = tmp;
+        }
+        float ior = n1 / n2;
+
+
+        float sinTheta1Squared = 1.0f - (cosTheta1 * cosTheta1);
+        float sinTheta2Squared = (ior * ior) * sinTheta1Squared;
+        float cosTheta2Squared = 1.0f - sinTheta2Squared;
+
+        if(cosTheta2Squared < 0.0f) {
+            result = Vector2.zero;
+ 
+            return false; //total internal reflection
+        }
+
+
+        float cosTheta2 = Mathf.Sqrt(cosTheta2Squared);
+
+        float s = cosTheta1 * ior - cosTheta2;
+
+
+        result.x = ior * incident.x + s * normal.x;
+        result.y = ior * incident.y + s * normal.y;
+
+        return true;
+    }
+
+
+    public int MaxTraceDepth = 2;
+
+
+    private bool NearestRaycast(Ray2D ray, ref RaycastMath.RaycastResult2D result) {
+        
+        int id = 0;
+        foreach (var surface in Surfaces) {
+            RaycastMath.RaycastResult2D raycast = new RaycastMath.RaycastResult2D();
+            if (surface.Raycast(ray, ref raycast)) {
+                if(id == 0) {
+                    result = raycast;
+                } else {
+                    if(Vector2.Distance(ray.origin, raycast.Point) < Vector2.Distance(ray.origin, result.Point)) {
+                        result = raycast;
+                    }
+                }
+                id++;
+            }
+        }
+        return id > 0;
+    }
+
+    private void TraceRay(Ray2D ray, int depth, float n1, float n2, List<Ray2D> result) {
+        if(depth >= MaxTraceDepth) {
+            return;
+        }
+
+        RaycastMath.RaycastResult2D cast = new RaycastMath.RaycastResult2D();
+        if (NearestRaycast(ray, ref cast)) {
+
+
+           // Gizmos.color = Color.blue;
+            //Gizmos.DrawLine(cast.Point, cast.Point + cast.Normal * 0.5f);
+
+
+            bool fromOutside = Vector2.Dot(cast.Normal, ray.direction) < 0.0f;
+
+            Vector2 offset = cast.Normal * 0.0001f;
+
+
+            if (Refract(ray.direction.normalized, cast.Normal, n1, n2, out var refractedRay)) {
+
+                if (fromOutside) {
+                    offset = -offset;
+                }
+
+                result.Add(new Ray2D(cast.Point, refractedRay.normalized));
+                TraceRay(new Ray2D(cast.Point + offset, refractedRay.normalized), depth + 1, n1, n2, result);
+            } else {
+                var reflectionVector = Reflect(ray.direction.normalized, Perpendicular(cast.Normal));
+
+                //Total internal reflection
+                result.Add(new Ray2D(cast.Point, reflectionVector));
+                TraceRay(new Ray2D(cast.Point - offset, reflectionVector), depth + 1, n1, n2, result);
+            }
+        }
+    }
+
+
+    private List<Vector2> Trace() {
+        List<Vector2> result = new List<Vector2>();
+
+        var lightRays = Light.GetRays();
+        //  var lines = Surface.GetTransformedShape();
+
+
+        foreach (var ray in lightRays) {
+
+           
+
+
+            
+            List<Ray2D> rayIntersections = new List<Ray2D>();
+            rayIntersections.Add(ray);
+
+
+
+
+
+            TraceRay(ray, 0, 1.0f, 1.5f, rayIntersections);
+
+
+
+            for(int i = 0; i < rayIntersections.Count - 1;  ++i) {
+
+                if(i % 2 == 0) {
+                    Gizmos.color = Color.white;
+                }
+                else {
+                    Gizmos.color = Color.red;
+                }
+
+              
+                Gizmos.DrawLine(rayIntersections[i].origin, rayIntersections[i + 1].origin);
+
+
+            }
+
+            Gizmos.color = Color.yellow;
+            Gizmos.DrawLine(rayIntersections[rayIntersections.Count-1].origin, rayIntersections[rayIntersections.Count-1].origin + rayIntersections[rayIntersections.Count - 1].direction * 100);
+
+
+
+            
+        }
+
+        return result;
+    }
+
+
+    private void OnDrawGizmos() {
+        Trace();
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+}

Assets/Scenes/Raytracer2D.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a7f3a1f22cffa8e43b8cbc5cd243101a

Assets/Scenes/SellmeierEquatiionView.cs

@@ -0,0 +1,79 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+public class SellmeierEquatiionView : MonoBehaviour
+{
+
+    private SellmeierEquation _equation;
+
+    // Start is called before the first frame update
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+
+
+    private float[] SamplePlot(SellmeierEquation equation) {
+        int samplesCount = 30;
+
+        float startLength = 0.3f;
+        float endLength = 0.6f;
+
+
+        float[] result = new float[samplesCount];
+
+        for (int i = 0; i < samplesCount; i++) {
+
+            if(i > 0) {
+                float step = ((endLength - startLength) / (samplesCount - 1));
+                result[i] = equation.Calc(startLength + step * i);
+            } else {
+                result[i] = equation.Calc(startLength);
+            }
+        }
+
+
+        return result;
+    }
+
+    private void OnDrawGizmos() {
+        if (_equation == null) {
+            var coeffs = new SellmeierEquation.Coefficients(
+                new float[] { 0.99654f, 0.18964f, 0.00411f },
+                new float[] { 0.00787f, 0.02191f, 3.85727f });
+            _equation = new SellmeierEquation(coeffs);
+        }
+
+        var samples = SamplePlot(_equation);
+
+        float minValue = samples.Min();
+        float maxValue = samples.Max();
+
+
+        float n365 = _equation.Calc(0.365f);
+        float n395 = _equation.Calc(0.395f);
+        float n405 = _equation.Calc(0.405f);
+
+        Debug.Log($"n365 = {n365}, n395 = {n395}, n405 = {n405}");
+
+        for (int i = 0; i < samples.Length - 1; i++) {
+            var n1 = samples[i];
+            var n2 = samples[i + 1];
+
+            float n1Scaled = (n1 - minValue) / (maxValue - minValue);
+            float n2Scaled = (n2 - minValue) / (maxValue - minValue);
+
+            Gizmos.DrawLine(transform.position + Vector3.right * (i / (float)samples.Length) + Vector3.up * n1Scaled, transform.position + Vector3.right * ((i + 1) / (float)samples.Length) + Vector3.up * n2Scaled);
+        }
+
+       
+    }
+}

Assets/Scenes/SellmeierEquatiionView.cs.meta

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+fileFormatVersion: 2
+guid: f017d192c43f1284c86c136425fcadb1

Assets/Scenes/SellmeierEquation.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class SellmeierEquation
+{
+    public class Coefficients {
+        public float[] B { get; private set; }
+        public float[] C { get; private set; }
+
+        public Coefficients(float[] b, float[] c) {
+            B = b; 
+            C = c;
+
+            if (b == null || c == null) {
+                throw new System.Exception("Invalid args");
+            }
+
+            if (b.Length == 0 || c.Length == 0) {
+                throw new System.Exception("Invalid args");
+            }
+
+            if (b.Length != c.Length) {
+                throw new System.Exception("Invalid args");
+            }
+        }
+    }
+
+
+    private Coefficients _coeffs;
+
+    public SellmeierEquation(Coefficients coeffs) {
+        _coeffs = coeffs;
+    }
+
+    public float Calc(float wavelength) {
+        return Calc(_coeffs, wavelength);
+    }
+
+    public static float Calc(Coefficients coeffs, float wavelength) {
+        float lSquare = wavelength * wavelength;
+        float resultSquared = 1.0f;
+
+        for (int i = 0; i < coeffs.B.Length; i++) {
+            float bi = coeffs.B[i];
+            float ci = coeffs.C[i];
+            resultSquared += (bi * lSquare) / (lSquare - ci);
+        }
+
+        return Mathf.Sqrt(resultSquared);
+    }
+}

Assets/Scenes/SellmeierEquation.cs.meta

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