Comments (1)
For context, I found out about this issue from this generic implementation of the diffuse
BSDF in Mitsuba2:
template <typename BSDFSample,
typename Value = typename BSDFSample::Value,
typename Spectrum = Spectrum<Value>>
Spectrum eval_impl(const BSDFSample &bs,
EMeasure measure,
const mask_t<Value> &/*active*/) const {
// (...)
Value n_dot_wi = Frame::cos_theta(bs.wi);
Value n_dot_wo = Frame::cos_theta(bs.wo);
auto reflectance = select((n_dot_wi <= 0.f) | (n_dot_wo <= 0.f),
Spectrum(0.f), Spectrum(m_reflectance));
// Unexpected result here when Value is Float:
// select() always returns Spectrum(m_reflectance).
return (math::InvPi * n_dot_wo) * reflectance;
}
This type of usage of select
in a generic context, along with operator|
is very common over the codebase.
from enoki.
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