Color GetLightPathColor(Vector3 pos, Vector3 dir, float length)
{
RayTrace.Ray ray = new RayTrace.Ray(pos, dir, length);
RayTrace.Intersect(ref ray);
if (ray.geomID == RayTrace.Invalid)
{
return(Color.white);
}
else
{
SimpleModel model = scene.models[(int)ray.geomID];
SimpleMesh mesh = model.mesh;
int t0 = mesh.triangles[ray.primID * 3 + 0];
int t1 = mesh.triangles[ray.primID * 3 + 1];
int t2 = mesh.triangles[ray.primID * 3 + 2];
Vector2 uv = RayTraceTool.Lerp(mesh.uv[t0], mesh.uv[t1], mesh.uv[t2], ray.u, ray.v);
Vector3 hitPos = ray.pos + ray.dir * ray.length;
Color texColor = model.material.PointSample(uv);
if (texColor.a < 0.99f)
{
Color aheadColor = GetLightPathColor(hitPos, dir * 0.01f, length - ray.length);
Color blendColor = (aheadColor * (1 - texColor.a)) + (texColor * texColor.a);
return(blendColor);
}
}
return(Color.black);
}
Color TraceColor(Vector3 startPos, Vector3 rayDir, int sample, int depth)
{
if (depth <= 0)
{
return(Color.black);
}
RayTrace.Ray ray = new RayTrace.Ray(startPos, rayDir, 1000);
RayTrace.Intersect(ref ray);
if (ray.geomID == RayTrace.Invalid)
{
return(skyColor);
}
else
{
SimpleModel model = scene.models[(int)ray.geomID];
SimpleMesh mesh = model.mesh;
int t0 = mesh.triangles[ray.primID * 3 + 0];
int t1 = mesh.triangles[ray.primID * 3 + 1];
int t2 = mesh.triangles[ray.primID * 3 + 2];
Vector2 uv = RayTraceTool.Lerp(mesh.uv[t0], mesh.uv[t1], mesh.uv[t2], ray.u, ray.v);
Color texColor = model.material.LinearSample(uv);
if (!ignoreMaterialColor)
{
texColor *= model.material.GetColor();
}
if (model.material.GetRenderMode() == SimpleMaterial.RenderMode.Opaque)
{
texColor.a = 1;
}
Vector3 hitPos = ray.pos + ray.dir * ray.length;
Vector3 hitNormal = RayTraceTool.Lerp(mesh.normals[t0], mesh.normals[t1], mesh.normals[t2], ray.u, ray.v);
hitNormal = (model.rst.rot * hitNormal);
float transFactor = 1 - texColor.a;
float glossiness = model.material.glossiness;
float reflectFactor = Mathf.Lerp(0.2f * glossiness, 1f, model.material.metallic);
if (reflectFactor > 0.01f)
{
reflectFactor = Fresnel_Schlick(Vector3.Dot(-rayDir, hitNormal), reflectFactor);
}
float grayscale = texColor.grayscale;
float diffuseFactor = Mathf.Clamp01(1 - transFactor - reflectFactor);
int transSample = (int)(sample * grayscale * transFactor);
int reflectSample = (int)(sample * reflectFactor);
int diffuseSample = (int)(sample * grayscale * diffuseFactor);
Color finaleColor = Color.black;
Color reflectColor = Color.black;
{
Color finalLightColor = Color.black;// GetAllLightsColor(model, hitPos, hitNormal) * (reflectFactor + scene.lights.Length);//光源直接贡献
if (reflectSample > 0)
{
Vector3 reflectDir = Vector3.Reflect(rayDir, hitNormal);
Vector3[] dirs = RayTraceTool.GetRandomDirs_BlinnPhong_Importance2(hitNormal, reflectDir, glossiness, reflectSample);
for (int i = 0; i < reflectSample; i++)
{
finalLightColor += TraceColor(hitPos + hitNormal * 0.01f, dirs[i], 1, depth - 1);//间接光贡献
}
finalLightColor /= (reflectSample);
}
reflectColor = Color.Lerp(Color.white, texColor, model.material.metallic) * finalLightColor;
}
Color diffuseColor = Color.black;
{
Color finalLightColor = GetAllLightsColor(model, hitPos, hitNormal) * (diffuseSample + scene.lights.Length);//光源直接贡献
if (diffuseSample > 0)
{
Vector3 reflectDir = Vector3.Reflect(rayDir, hitNormal);
Vector3[] dirs = RayTraceTool.GetRandomDirs_RoundProj(hitNormal, diffuseSample);
for (int i = 0; i < diffuseSample; i++)
{
finalLightColor += TraceColor(hitPos + hitNormal * 0.01f, dirs[i], 1, depth - 1);//间接光贡献
}
}
finalLightColor /= (diffuseSample + scene.lights.Length);
diffuseColor = texColor * finalLightColor;
}
//Color reflectColor = Color.black;
//if(reflectFactor > 0.01f){
// Vector3 refDir = Vector3.Reflect(rayDir,hitNormal);
// Color finalLightColor = TraceColor(hitPos + refDir * 0.01f, refDir,reflectSample ,depth - 1);
// reflectColor = finalLightColor;
//}
finaleColor = reflectColor * reflectFactor + diffuseColor * diffuseFactor;
if (texColor.a < 0.99f)
{
Color transColor = TraceColor(hitPos + rayDir * 0.01f, rayDir, transSample, depth);
if (model.material.GetRenderMode() == SimpleMaterial.RenderMode.Alphablend)
{
finaleColor = finaleColor * texColor.a + transColor * (1 - texColor.a);
}
else if (model.material.GetRenderMode() == SimpleMaterial.RenderMode.Multiply)
{
finaleColor = finaleColor * transColor;
}
else if (model.material.GetRenderMode() == SimpleMaterial.RenderMode.Additive)
{
finaleColor = finaleColor + transColor;
}
}
return(finaleColor);
}
}