IEnumerator DoLight(SpriteRenderer sprite, Color color)
{
float h;
float s;
float v;
ColorManipulator.ColorToHSV(color, out h, out s, out v);
var wait = new WaitForSeconds(0.25f);
while (true)
{
if (!this.ShouldBeLit)
{
yield return(null);
continue;
}
v = Mathf.Lerp(0, 1, this.LightLevel);
sprite.color = ColorManipulator.ColorFromHSV(h, s, v);
yield return(wait);
}
}
/// <summary>
/// Most scene objects use the same procedure for calculating color at a
/// particular point, however sometimes this must be overridden to first
/// adjust the object normal
/// </summary>
public virtual Color PointColor(Scene scene, Vector3 intersectionPoint, Vector3 intersectionNormal, Vector3 rayDirection, int reflections)
{
Color pointColor = Color.FromArgb(0, 0, 0);
// Determine intensity contribution from each light source
foreach (ISceneLight light in scene.lights)
{
double diffuse = light.Diffuse(scene, intersectionPoint, intersectionNormal);
double specular = light.Specular(scene, intersectionPoint, intersectionNormal, rayDirection);
specular = specularReflectivity * Math.Pow(specular, specularFalloff);
// Diffuse lighting takes the color of the object
Color temp = ColorManipulator.Multiply(color, diffuse);
pointColor = ColorManipulator.Add(pointColor, temp);
// Specular highlights take the color of the light (currently fixed to white)
temp = ColorManipulator.Multiply(Color.White, specular);
pointColor = ColorManipulator.Add(pointColor, temp);
}
// Transparency
Intersection intersection = scene.ClosestIntersection(intersectionPoint, rayDirection);
if (intersection.DidIntersect)
{
// TODO refraction
var intersectionPointNew = intersectionPoint + (float)(intersection.Position) * rayDirection;
Color objColor = intersection.IntersectedObject.PointColor(scene, intersectionPointNew, intersection.Normal, rayDirection, reflections);
pointColor = ColorManipulator.Add(
ColorManipulator.Multiply(pointColor, 1 - transparency),
ColorManipulator.Multiply(objColor, transparency));
}
// Color contribution from reflections
if (reflections > 0)
{
// Reflect view ray across intersection normal and fire new ray in this direction
Vector3 viewReflection = rayDirection - 2 * intersectionNormal * Vector3.Dot(rayDirection, intersectionNormal);
intersection = scene.ClosestIntersection(intersectionPoint, viewReflection);
// No reflection
if (!intersection.DidIntersect)
{
return(pointColor);
}
// Blend object color with reflected color according to object reflectivity
Vector3 intersectionPointNew = intersectionPoint + (float)(intersection.Position) * viewReflection;
Color objColor = intersection.IntersectedObject.PointColor(scene, intersectionPointNew, intersection.Normal, viewReflection, reflections - 1);
pointColor = ColorManipulator.Add(ColorManipulator.Multiply(objColor, reflectivity), ColorManipulator.Multiply(pointColor, (1 - reflectivity)));
}
return(pointColor);
}
