While doing some tests with SPPM I noticed the glass material refractions are strange, showing too dark refractions respect to what it should be.
I've attached a scene you can try, and I've seen this problem in v2.1.1 but also I could trace it down to old Core versions such as v0.1.2
SPPM (wrong glass refraction, darker than it should)
Also when using old Core v0.1.2:
This is the same scene but using photon maps (2M for diffuse and 5M for caustic). Here the glass refractions are normal.
|sppm_glass_wrong v2.1.1 (SPPM, wrong).png||473.41 KB|
|sppm_glass_wrong v2.1.1 (photon map OK).png||522.83 KB|
|sppm_glass_wrong old v0.1.2 (SPPM, wrong).png||456.25 KB|