/* task that renders a single screen tile */
Vec3fa renderPixelStandard(float x, float y, const Vec3fa& vx, const Vec3fa& vy, const Vec3fa& vz, const Vec3fa& p)
{
/* initialize ray */
RTCRay ray;
ray.org = p;
ray.dir = normalize(x*vx + y*vy + vz);
ray.tnear = 0.0f;
ray.tfar = inf;
ray.geomID = RTC_INVALID_GEOMETRY_ID;
ray.primID = RTC_INVALID_GEOMETRY_ID;
ray.mask = -1;
ray.time = 0;
/* intersect ray with scene */
rtcIntersect(g_scene,ray);
/* shade pixels */
Vec3fa color = Vec3fa(0.0f);
if (ray.geomID != RTC_INVALID_GEOMETRY_ID)
{
Vec3fa diffuse = ray.geomID != 0 ? Vec3fa(0.9f,0.6f,0.5f) : Vec3fa(0.8f,0.0f,0.0f);
color = color + diffuse*0.5f;
Vec3fa lightDir = normalize(Vec3fa(-1,-1,-1));
Vec3fa Ng = normalize(ray.Ng);
#if ENABLE_SMOOTH_NORMALS
Vec3fa P = ray.org + ray.tfar*ray.dir;
if (ray.geomID > 0) {
Vec3fa dPdu,dPdv;
int geomID = ray.geomID; {
rtcInterpolate(g_scene,geomID,ray.primID,ray.u,ray.v,RTC_VERTEX_BUFFER,nullptr,&dPdu.x,&dPdv.x,3);
}
Ng = normalize(cross(dPdv,dPdu));
dPdu = dPdu + Ng*displacement_du(P,dPdu);
dPdv = dPdv + Ng*displacement_dv(P,dPdv);
Ng = normalize(cross(dPdv,dPdu));
}
#endif
/* initialize shadow ray */
RTCRay shadow;
shadow.org = ray.org + ray.tfar*ray.dir;
shadow.dir = neg(lightDir);
shadow.tnear = 0.001f;
shadow.tfar = inf;
shadow.geomID = RTC_INVALID_GEOMETRY_ID;
shadow.primID = RTC_INVALID_GEOMETRY_ID;
shadow.mask = -1;
shadow.time = 0;
/* trace shadow ray */
rtcOccluded(g_scene,shadow);
/* add light contribution */
if (shadow.geomID == RTC_INVALID_GEOMETRY_ID)
color = color + diffuse*clamp(-(dot(lightDir,Ng)),0.0f,1.0f);
}
return color;
}
/* task that renders a single screen tile */
Vec3fa renderPixelStandard(float x, float y, const ISPCCamera& camera, RayStats& stats)
{
RTCIntersectContext context;
rtcInitIntersectContext(&context);
/* initialize ray */
Ray ray(Vec3fa(camera.xfm.p), Vec3fa(normalize(x*camera.xfm.l.vx + y*camera.xfm.l.vy + camera.xfm.l.vz)), 0.0f, inf);
/* intersect ray with scene */
rtcIntersect1(g_scene,&context,RTCRayHit_(ray));
RayStats_addRay(stats);
/* shade pixels */
Vec3fa color = Vec3fa(0.0f);
if (ray.geomID != RTC_INVALID_GEOMETRY_ID)
{
Vec3fa diffuse = ray.geomID != 0 ? Vec3fa(0.9f,0.6f,0.5f) : Vec3fa(0.8f,0.0f,0.0f);
color = color + diffuse*0.5f;
Vec3fa lightDir = normalize(Vec3fa(-1,-1,-1));
Vec3fa Ng = normalize(ray.Ng);
#if ENABLE_SMOOTH_NORMALS
Vec3fa P = ray.org + ray.tfar*ray.dir;
if (ray.geomID > 0) {
Vec3fa dPdu,dPdv;
unsigned int geomID = ray.geomID; {
rtcInterpolate1(rtcGetGeometry(g_scene,geomID),ray.primID,ray.u,ray.v,RTC_BUFFER_TYPE_VERTEX,0,nullptr,&dPdu.x,&dPdv.x,3);
}
Ng = normalize(cross(dPdu,dPdv));
dPdu = dPdu + Ng*displacement_du(P,dPdu);
dPdv = dPdv + Ng*displacement_dv(P,dPdv);
Ng = normalize(cross(dPdu,dPdv));
}
#endif
/* initialize shadow ray */
Ray shadow(ray.org + ray.tfar*ray.dir, neg(lightDir), 0.001f, inf, 0.0f);
/* trace shadow ray */
rtcOccluded1(g_scene,&context,RTCRay_(shadow));
RayStats_addShadowRay(stats);
/* add light contribution */
if (shadow.tfar >= 0.0f)
color = color + diffuse*clamp(-(dot(lightDir,Ng)),0.0f,1.0f);
}
return color;
}