private Geometry GetClosestGeometry(Vector3 position)
{
var minimalDistance = MAX_DISTANCE;
Geometry closestGeometry = new NullGeometry();
foreach (var geometry in this.geometries)
{
var geometryDistance = geometry.GetDistanceTo(position);
if (geometryDistance < minimalDistance)
{
minimalDistance = geometryDistance;
closestGeometry = geometry;
}
}
return(closestGeometry);
}
public Color MarchRay(Ray ray, float totalDistance = 0f)
{
var latestDistance = MAX_DISTANCE;
Geometry closestGeometry = new NullGeometry();
for (var c = 0; c < MAX_STEPS; c++)
{
var rayPoint = ray.GetPoint(totalDistance);
closestGeometry = GetClosestGeometry(rayPoint);
if (closestGeometry is NullGeometry)
{
break;
}
latestDistance = closestGeometry.GetDistanceTo(rayPoint);
totalDistance += latestDistance;
if (latestDistance < MIN_DISTANCE)
{
break;
}
if (totalDistance >= MAX_DISTANCE)
{
break;
}
}
if (latestDistance <= MIN_DISTANCE)
{
Vector3 surfaceNormal = closestGeometry.GetSurfaceNormal(ray.GetPoint(totalDistance));
float t = Vector3.Angle(surfaceNormal, ray.direction.normalized) / 360;
return(Color.Lerp(Color.black, Color.green, t));
}
else if (totalDistance >= MAX_DISTANCE)
{
return(Color.black);
}
return(Color.black);
}