private Light GetLight(MeshObject hitObject, Intersection hitPoint)
{
var light = new Light {
Brightness = AmbientBrightness
};
for (var j = 0; j < LightSources.Count; ++j)
{
var lightSource = LightSources[j];
var shadowRay = lightSource.GetShadowRay(hitPoint.IntersectionPoint);
var currentLight = new Light {
Brightness = lightSource.Brightness
};
hitObject.Material.SurfaceShader.TryGetBrigthness(currentLight, hitPoint, shadowRay, out var shadedBrigthness);
currentLight.Brightness = shadedBrigthness;
if (currentLight.Brightness > light.Brightness)
{
light = currentLight;
}
}
return(light);
}
public void ProjectToZBuffer(Vector3 v1, Vector3 v2, Vector3 v3, Vector3 n, ZBufferItem[] zbuffer, MeshObject obj)
{
var p1 = GetPlaneIntersectionPoint(v1);
var p2 = GetPlaneIntersectionPoint(v2);
var p3 = GetPlaneIntersectionPoint(v3);
//if (p1.X == 0 && p2.X == 0 && p3.X == 0
// || p1.Y == 0 && p2.Y == 0 && p3.Y == 0
// || p1.X == rayFactory.Width - 1 && p2.X == rayFactory.Width - 1 && p3.X == rayFactory.Width - 1
// || p1.Y == rayFactory.Height - 1 && p2.Y == rayFactory.Height - 1 && p3.Y == rayFactory.Height - 1)
//{
// return;
//}
var minX = Math.Min(Math.Min(p1.X, p2.X), p3.X);
var maxX = Math.Max(Math.Max(p1.X, p2.X), p3.X);
var minY = Math.Min(Math.Min(p1.Y, p2.Y), p3.Y);
var maxY = Math.Max(Math.Max(p1.Y, p2.Y), p3.Y);
for (var x = minX; x <= maxX; ++x)
{
for (var y = minY; y <= maxY; ++y)
{
var ray = GetCameraRay(x, y);
var isSurface = ray.IsSurfaceHit(n);
if (!isSurface)
{
return;
}
if (ray.TryIntersectTriangle(v1, v2, v3, out var u, out var v, out _))
{
var d = Vector3.Dot(v1 - ray.StartPoint, n) / Vector3.Dot(n, ray.Direction);
var i = y * pixelWidth + x;
if (zbuffer[i].Intersection.Distance > d)
{
zbuffer[i].Intersection.Distance = d;
zbuffer[i].Object = obj;
zbuffer[i].Intersection.NormalVector = n;
zbuffer[i].u = u;
zbuffer[i].v = v;
zbuffer[i].Intersection.IntersectionPoint = d * ray.Direction + ray.StartPoint;
}
}
}
}
}
