Spectrum ProjectionLight::Projection(const Vector3f &w) const {
Vector3f wl = WorldToLight(w);
// Discard directions behind projection light
if (wl.z < hither) return 0;
// Project point onto projection plane and compute light
Point3f p = lightProjection(Point3f(wl.x, wl.y, wl.z));
if (!Inside(Point2f(p.x, p.y), screenBounds)) return 0.f;
if (!projectionMap) return 1;
Point2f st = Point2f(screenBounds.Offset(Point2f(p.x, p.y)));
return Spectrum(projectionMap->Lookup(st), SpectrumType::Illuminant);
}
Spectrum ProjectionLight::Projection(const Vector &w) const {
Vector wl = WorldToLight(w);
// Discard directions behind projection light
if (wl.z < hither) return 0.;
// Project point onto projection plane and compute light
Point Pl = lightProjection(Point(wl.x, wl.y, wl.z));
if (Pl.x < screenX0 || Pl.x > screenX1 ||
Pl.y < screenY0 || Pl.y > screenY1) return 0.;
if (!projectionMap) return 1;
float s = (Pl.x - screenX0) / (screenX1 - screenX0);
float t = (Pl.y - screenY0) / (screenY1 - screenY0);
return Spectrum(projectionMap->Lookup(s, t), SPECTRUM_ILLUMINANT);
}
Vector ProjectionLight::Projection(const Point& p) const
{
Vector w = Normalize(lightPos - p);
Vector wl = WorldToLight(w);
// Discard directions behind projection light
if (wl.z < hither) return Vector();
// Project point onto projection plane and compute light
Point Pl = lightProjection(Point(wl.x, wl.y, wl.z));
if (Pl.x < screenX0 || Pl.x > screenX1 ||
Pl.y < screenY0 || Pl.y > screenY1) return Vector();
float s = (Pl.x - screenX0) / (screenX1 - screenX0);
float t = (Pl.y - screenY0) / (screenY1 - screenY0);
// change s,t to image coordinate
int u = texture->cols - int(texture->cols * s);
int v = int(texture->rows * t);
cv::Vec3b texLight = texture->at<cv::Vec3b>(v, u);
return Vector(float(texLight[0])/256.f, float(texLight[1])/256.f, float(texLight[2])/256.f);
}
