static void Test()
{
SceneDebug dbg = new SceneDebug();
dbg.BeginBranch(new Vector3(1, 1, 1));
dbg.BeginBranch(new Vector3(2, 2, 2));
dbg.BeginBranch(new Vector3(3, 3, 3));
dbg.EndBranch();
dbg.BeginBranch(new Vector3(4, 4, 4));
dbg.EndBranch();
string fname = $"A:\\img\\{FileName()}";
dbg.SaveToFile(fname + ".obj");
}
public override Light IntersectLight(Vector3 point, Vector3 dir, Vector3 normal, int deep)
{
#if RayDebugger
SceneDebug Debugger = Scene.debugger;
if (Debugger != null)
{
Debugger.BeginBranch(point);
Debugger.EndBranch();
}
#endif
if (dir.Y > 0.94f)
{
return(Light.White);
}
float y = 0.5f * (dir.Y + 1.0f);
return((1.0f - y) * Light.White + y * new Light(0.51f, 0.68f, 0.95f));
}
/// <summary>
/// 相交点辐射光
/// </summary>
/// <param name="point"></param>
/// <param name="normal"></param>
/// <param name="deep"></param>
/// <returns></returns>
public virtual Light IntersectLight(Vector3 point, Vector3 dir, Vector3 normal, int deep)
{
#if RayDebugger
SceneDebug Debugger = Scene.debugger;
if (Debugger != null)
{
Debugger.BeginBranch(point);
}
#endif
Light returnlight = default;
// 发光体返回发光颜色
if (Material.LightAble)
{
returnlight = Material.LightColor;
goto returnPoint;
}
// 递归深度极限
if (deep <= 1)
{
returnlight = Material.BaseColor * 0.3f;
goto returnPoint;
}
dir = Vector3.Normalize(dir);
bool IsBackFace = false;
if (Vector3.Dot(dir, normal) > 0) // 背面
{
IsBackFace = true;
normal = -normal;
}
#region 计算追踪光线总数
int traceRayNum = RenderConfiguration.Configurations.ReflectSmapingLevel - RenderConfiguration.Configurations.RayTraceDeep + deep;
{
traceRayNum = (int)(traceRayNum * Material.AMetalDegree);
if (traceRayNum < 1)
{
traceRayNum = 1;
}
traceRayNum = traceRayNum * 3 - 2;
}
#endregion
#region 计算折射光
Light refractl = default; // 折射光
float refractPower = 0.0f; // 折射光强度
if (Material.IsTransparent)
{
float riindex = Material.RefractiveIndices;
if (!IsBackFace)
{
riindex = 1.0f / riindex;
}
// 计算折射光线
(float pow, Vector3 rdir) = Tools.Refract(dir, normal, riindex);
if (pow < 0)
{
goto endRefract;
}
refractPower = pow * Material.TransparentIndex;
int raycount = (int)(traceRayNum * refractPower);
traceRayNum -= raycount;
float randomScale = Material.AMetalDegree * Material.AMetalDegree * 0.5f;
//raycount = (int)(traceRayNum * randomScale);
//raycount = (int)(traceRayNum * Material.AMetalDegree);
if (raycount < 1 && refractPower > 0.00001)
{
raycount = 1;
}
if (raycount == 0)
{
refractl = Material.BaseColor;
goto endRefract;
}
rdir = normal * randomScale + rdir * (1.0f - randomScale);
for (int nsmap = 0; nsmap < raycount; nsmap++)
{
Vector3 raydir = Tools.RandomPointInSphere() * randomScale + rdir;
Ray r = new Ray(point, raydir);
//Console.WriteLine('\t' + this.Name + " [refract] : " + r);
(Light c, float distance) = Scene.Light(r, deep - 1, this);
if (IsBackFace) //内部光线，进行吸收计算
{
float xsl = Math.Log(distance + 1.0f) + 1.0f;
refractl *= Material.BaseColor / xsl;
}
refractl += c;
}
refractl /= raycount;
}
endRefract:
#endregion
#region 计算反射光
Light reflectl = default; // 反射光
{
int raycount = traceRayNum;
if (raycount < 1)
{
if (refractPower < 0.99f)
{
raycount = 1;
}
else
{
reflectl = Material.BaseColor;
goto endReflact;
}
}
Vector3 spO;
{
//Vector3 spRO = Tools.Reflect(dir, normal);
Vector3 spRO = Vector3.Reflect(dir, normal);
//spO = normal * (1.0f - Material.MetalDegree) + spRO * Material.MetalDegree;
spO = Vector3.Lerp(normal, spRO, Material.MetalDegree);
}
for (int nsmap = 0; nsmap < raycount; nsmap++)
{
Vector3 tp = Tools.RandomPointInSphere() * Material.AMetalDegree + spO;
Vector3 raydir = tp;
while (raydir.LengthSquared() < 0.1)
{
tp = Tools.RandomPointInSphere() + spO;
raydir = tp;
}
Ray r = new Ray(point, raydir);
//Console.WriteLine('\t' + this.Name + " [reflact] : " + r);
(Light c, float _) = Scene.Light(r, deep - 1, this); //, this);
reflectl += c;
}
reflectl /= raycount;
reflectl *= (0.06f * Material.MetalDegree + 0.93f) * Material.BaseColor;
}
#endregion
returnlight = refractl * refractPower + reflectl * (1.0f - refractPower);
endReflact:
returnPoint:
#if RayDebugger
if (Debugger != null)
{
Debugger.EndBranch();
}
#endif
return(returnlight);
}