private void ReflectFunc(Ray ray, RaycastHit hit, MicrofacetModel BRDF, int depth, float multi, ref Color slightColor, ref Color dlightColor)
{
//反射
var V = -ray.direction;
var N = hit.normal;
var dirs = BRDF.ReflectDirections(N, V, reflectCount);
float countInv = 1.0f / dirs.Count;
foreach (var reflectDir in dirs)
{
var L = reflectDir;
Ray refRay = new Ray(hit.point + N * 0.001f, reflectDir);
//if (FixNLV(ref N, L, V) == false) continue;
var s = BRDF.getSIntensity(N, L, V);
var d = BRDF.getDIntensity();
Color reflectColor = Color.black;
RaycastHit reflecthit;
if (RayTracing(refRay, out reflectColor, out reflecthit, depth + 1, multi * Math.Max(s, d)))
{
float intensity = countInv;
reflectColor *= intensity;
//高光计算
slightColor += reflectColor * s;
//漫反射计算
dlightColor += reflectColor * d;
}
}
}
private void Lighting(Ray ray, RaycastHit hit, MicrofacetModel BRDF, ref Color slightColor, ref Color dlightColor)
{
foreach (var light in lights)
{
switch (light.type)
{
case LightType.Spot:
{
}
break;
case LightType.Directional:
break;
case LightType.Point:
{
var L = light.transform.position - hit.point;
var len = L.magnitude;
L.Normalize();
//点到光源之间被遮挡，阴影特效
if (len > light.range || Physics.Raycast(hit.point + hit.normal * 0.001f, L, len))
{
break;
}
var N = hit.normal;
var V = -ray.direction;
//在碰撞点上面的光强
var intensity = light.intensity;
intensity *= (float)(Math.Pow(1 - len / light.range, 2)); //光根据距离衰减
intensity *= Math.Max(0, Vector3.Dot(N, L)); //光投影到面的衰减
//if (FixNLV(ref N, L, V) == false) continue;
//高光计算
slightColor += light.color * intensity * BRDF.getSIntensity(N, L, V);
//漫反射计算
dlightColor += light.color * intensity * BRDF.getDIntensity(); //在半球上进行均匀漫反射 d*1/(2*pi)
}
break;
case LightType.Area:
break;
default:
break;
}
}
}