/* 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)
{
/* initialize ray */
RTCRay ray;
ray.org = Vec3fa(camera.xfm.p);
ray.dir = Vec3fa(normalize(x*camera.xfm.l.vx + y*camera.xfm.l.vy + camera.xfm.l.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)
{
/* interpolate diffuse color */
Vec3fa diffuse = Vec3fa(1.0f,0.0f,0.0f);
if (ray.geomID > 0)
{
unsigned int geomID = ray.geomID; {
rtcInterpolate(g_scene,geomID,ray.primID,ray.u,ray.v,RTC_USER_VERTEX_BUFFER0,&diffuse.x,nullptr,nullptr,3);
}
diffuse = 0.5f*diffuse;
}
/* calculate smooth shading normal */
Vec3fa Ng = normalize(ray.Ng);
color = color + diffuse*0.5f;
Vec3fa lightDir = normalize(Vec3fa(-1,-1,-1));
/* 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 = 1;
shadow.primID = 0;
shadow.mask = -1;
shadow.time = 0;
/* trace shadow ray */
rtcOccluded(g_scene,shadow);
/* add light contribution */
if (shadow.geomID) {
Vec3fa r = normalize(reflect(ray.dir,Ng));
float s = pow(clamp(dot(r,lightDir),0.0f,1.0f),10.0f);
float d = clamp(-dot(lightDir,Ng),0.0f,1.0f);
color = color + diffuse*d + 0.5f*Vec3fa(s);
}
}
return color;
}
/* task that renders a single screen tile */
Vec3fa renderPixelStandard(float x, float y, const ISPCCamera& camera, RayStats& stats)
{
/* initialize sampler */
RandomSampler sampler;
RandomSampler_init(sampler, (int)x, (int)y, 0);
/* initialize ray */
RTCRay ray;
ray.org = Vec3fa(camera.xfm.p);
ray.dir = Vec3fa(normalize(x*camera.xfm.l.vx + y*camera.xfm.l.vy + camera.xfm.l.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 = RandomSampler_get1D(sampler);
/* intersect ray with scene */
RTCIntersectContext context;
context.flags = g_iflags_coherent;
rtcIntersect1Ex(g_scene,&context,ray);
RayStats_addRay(stats);
/* shade background black */
if (ray.geomID == RTC_INVALID_GEOMETRY_ID) {
return Vec3fa(0.0f);
}
/* shade all rays that hit something */
Vec3fa color = Vec3fa(0.5f);
/* compute differential geometry */
DifferentialGeometry dg;
dg.geomID = ray.geomID;
dg.primID = ray.primID;
dg.u = ray.u;
dg.v = ray.v;
dg.P = ray.org+ray.tfar*ray.dir;
dg.Ng = ray.Ng;
dg.Ns = ray.Ng;
if (g_use_smooth_normals)
if (ray.geomID != RTC_INVALID_GEOMETRY_ID) // FIXME: workaround for ISPC bug, location reached with empty execution mask
{
Vec3fa dPdu,dPdv;
unsigned int geomID = ray.geomID; {
rtcInterpolate(g_scene,geomID,ray.primID,ray.u,ray.v,RTC_VERTEX_BUFFER0,nullptr,&dPdu.x,&dPdv.x,3);
}
dg.Ns = cross(dPdv,dPdu);
}
int materialID = postIntersect(ray,dg);
dg.Ng = face_forward(ray.dir,normalize(dg.Ng));
dg.Ns = face_forward(ray.dir,normalize(dg.Ns));
/* shade */
if (g_ispc_scene->materials[materialID]->type == MATERIAL_OBJ) {
ISPCOBJMaterial* material = (ISPCOBJMaterial*) g_ispc_scene->materials[materialID];
color = Vec3fa(material->Kd);
}
return color*dot(neg(ray.dir),dg.Ns);
}
