EdgeInfo FindEdge(LightCastInfo minLightCast, LightCastInfo maxLightCast)
{
float minAgle = minLightCast.angle;
float maxAngle = maxLightCast.angle;
Vector3 minPoint = Vector3.zero;
Vector3 maxPoint = Vector3.zero;
for (int i = 0; i < edgeResolveIterations; i++)
{
float angle = (minAgle + maxAngle) / 2;
LightCastInfo newLightCast = LightCast(angle);
bool edgeDistanceThresholdExceeded = Mathf.Abs(minLightCast.dist - newLightCast.dist) > edgeDistanceThreshold;
if (newLightCast.hit == minLightCast.hit && !edgeDistanceThresholdExceeded)
{
minAgle = angle;
minPoint = newLightCast.point;
}
else
{
maxAngle = angle;
maxPoint = newLightCast.point;
}
}
return(new EdgeInfo(minPoint, maxPoint));
}
void DrawLightField()
{
int stepCount = Mathf.RoundToInt(lightAngle * meshResolution);
float stepAngleSize = lightAngle / stepCount;
List <Vector3> lightPoints = new List <Vector3>();
LightCastInfo oldLightCast = new LightCastInfo();
for (int i = 0; i <= stepCount; i++)
{
float angle = transform.eulerAngles.z - lightAngle / 2 + stepAngleSize * i;
LightCastInfo newLightCast = LightCast(angle);
if (i > 0)
{
bool edgeDistanceThresholdExceeded = Mathf.Abs(oldLightCast.dist - newLightCast.dist) > edgeDistanceThreshold;
if (oldLightCast.hit != newLightCast.hit || oldLightCast.hit && newLightCast.hit && edgeDistanceThresholdExceeded)
{
EdgeInfo edge = FindEdge(oldLightCast, newLightCast);
if (edge.pointA != Vector3.zero)
{
lightPoints.Add(edge.pointA);
}
if (edge.pointB != Vector3.zero)
{
lightPoints.Add(edge.pointB);
}
}
}
lightPoints.Add(newLightCast.point);
oldLightCast = newLightCast;
}
int vertexCount = lightPoints.Count + 1;
Vector3[] vertecies = new Vector3[vertexCount];
Vector2[] uvs = new Vector2[vertecies.Length];
int[] triangles = new int[(vertexCount - 2) * 3];
vertecies[0] = Vector3.zero;
for (int i = 0; i < vertexCount - 1; i++)
{
var vert = transform.InverseTransformPoint(lightPoints[i]) * lightMultiplier;
vertecies[i + 1] = vert;
if (i < vertexCount - 2)
{
triangles[i * 3] = 0;
triangles[i * 3 + 1] = i + 1;
triangles[i * 3 + 2] = i + 2;
}
}
for (int i = 0; i < uvs.Length; i++)
{
uvs[i] = new Vector2(0.5f + (vertecies[i].x) / (2 * (lightRadius * lightMultiplier)), 0.5f + (vertecies[i].y) / (2 * (lightRadius * lightMultiplier)));
}
lightMesh.Clear();
lightMesh.vertices = vertecies;
lightMesh.triangles = triangles;
lightMesh.uv = uvs;
lightMesh.RecalculateNormals();
}
