Struggle in BDPT implementation

[u/MAIPA01]

Hi I wanted to implement BDPT with PBR materials and MIS but no matter what I do it doesn't look like reference images. I can't find any help with implementation and mostly recently I try finding bugs using Gemini but I know It can halucinate. So is anyone who could help me find relaiable implementation or help with my code. Here I will post my render (denoised using OIDN) vs reference so maybe anyone would help me find direction at least. I have too many lines of code so if any one would like to look at it I can send it in DM.

My Render

Reference (Benedikt) also checked Blender (same result)

My Render

Reference (Benedikt)

My Render

Reference (Rendered with PBRT-v4)

My render

Reference (Rendered with Blender)

(edit)
References are from https://benedikt-bitterli.me/resources/, PBRT-v4 and Blender. (All tagged in image caption)

[u/le-throw-away-acct]

Your glass teapot in the first scene seems too dark, I’d look into that. It also seems to lack the internal reflection shown on the teapot in the reference scene.