protected override void Render(REScene scene, Camera3D camera, Canvas canvas)
{
double d = 2 * camera.FocusDistance * System.Math.Tan(camera.FOV / 2);
double h = d / System.Math.Sqrt(camera.Ratio * camera.Ratio + 1);
double w = h * camera.Ratio;
double hFOV = 2 * System.Math.Atan(w / (2 * camera.FocusDistance));
double vFOV = 2 * System.Math.Atan(h / (2 * camera.FocusDistance));
double alpha0 = -hFOV / 2;
double beta0 = -vFOV / 2;
double dAlpha = hFOV / canvas.Width;
double dBeta = vFOV / canvas.Height;
double alpha = alpha0, beta = beta0;
var ray = new ColoredRay3D();
var dirZ = (float)camera.FocusDistance;
for (int cy = 0; cy < canvas.Height; cy++) {
var dirY = (float)(System.Math.Tan(beta) * camera.FocusDistance);
for (int cx = 0; cx < canvas.Width; cx++) {
var dirX = (float)(System.Math.Tan(alpha) * camera.FocusDistance);
ray.Color = new PreciseColor(1.0f, 1.0f, 1.0f);
ray.Start = new Vector3D(camera.Position.X, camera.Position.Y, camera.Position.Z - (float)camera.FocusDistance);
ray.End = ray.Start + new Vector3D(dirX, dirY, dirZ);
PreciseColor color = ProcessRay(ray, scene, 0);
canvas[cx, cy] += color;
alpha += dAlpha;
}
alpha = alpha0;
beta += dBeta;
}
}
protected virtual NearestIntersection GetIntersections(ColoredRay3D ray, REScene scene)
{
var intersections = new NearestIntersection();
ray.End = ray.Start + (ray.End - ray.Start).Normalize();
scene.Objects.GetIntersections(ray, intersections);
return intersections;
}
protected virtual PreciseColor ProcessRay(ColoredRay3D ray, REScene scene, int level)
{
NearestIntersection intersections = GetIntersections(ray, scene);
var color = new PreciseColor();
Vector3D dir = (ray.End - ray.Start).Normalize();
Intersection intersection = intersections.Get();
if (intersection != null) {
if (intersection.Length > 0.05) {
Material material = intersection.Shape3D.Material;
color += material.DiffuseColor * material.AmbientIntensity;
RayTracingOptions options = GetRayTracingOptions(intersection.Shape3D);
if ((options & RayTracingOptions.Diffuse) > 0) {
color += GetDiffuseIllumination(intersection, scene);
}
if ((options & RayTracingOptions.Speculate) > 0) {
if (level < 5 && material.Shininess > 0.001) {
var reflected = ray;
Vector3D reflectedStart = ray.Start + dir * intersection.Length;
Vector3D reflectedEnd = reflectedStart + Math3D.GetReflectedVector(dir, intersection.Normal);
reflected.Start = reflectedStart;
reflected.End = reflectedEnd;
color += ProcessRay(reflected, scene, level + 1) * material.Shininess;
}
}
}
}
return color;
}
protected virtual REScene PrepareScene(Scene3D scene, Camera3D camera)
{
var wrappedScene = new REScene();
var preparationContext = new RenderPreparationContext(wrappedScene);
preparationContext.PushCoordinateSystem(camera.CoordinateSystem);
_shapeDecorator = new Shape3DDecorator(preparationContext);
scene.Shapes.AcceptVisitor(_shapeDecorator);
wrappedScene.Objects.Add(_shapeDecorator.DecoratedShape);
scene.Lights.AcceptVisitor(_shapeDecorator);
wrappedScene.Lights.Add(_shapeDecorator.DecoratedLight);
preparationContext.PopCoordinateSystem();
return wrappedScene;
}
protected override void Render(REScene scene, Camera3D camera, Canvas canvas)
{
foreach (REBaseLight lightSource in scene.Lights) {
var start = lightSource.Origin.CoordinateSystem.Position;
var dir = new Vector3D(
(float)(_rnd.NextDouble() * 2 - 1),
(float)(_rnd.NextDouble() * 2 - 1),
(float)(_rnd.NextDouble() * 2 - 1)
).Normalize();
var ray = new ColoredRay3D {
Color = new PreciseColor(1, 1, 1),
Start = start,
End = start + dir
};
ProcessRay(ray, scene, 0);
}
}
public RenderPreparationContext(REScene scene) {
this.scene = scene;
}
protected REBaseLight(Light3D origin, REScene scene)
{
this.origin = origin;
this.scene = scene;
}
protected abstract void Render(REScene scene, Camera3D camera, Canvas canvas);
protected virtual PreciseColor GetSpecularIllumination(Intersection intersection, REScene scene)
{
return scene.Lights.GetSpecularIllumination(intersection);
}
public REOmniLight(OmniLight3D origin, Vector3D position, REScene scene)
: base(origin, scene)
{
omni = origin;
this.position = position;
}