I want to get rid of the noise but I can't for the sake of god find out what is causing it. I am using an HDRI. I am not using glass materials. I blocked all the HDRI light with objects apart from 2 windows (no glass, no geometry, just 2 big openings). Here is a picture (32 samples) :enter image description here (I am new to blender but I am very familiar with 3d environments) (HDRI is hidden by ''world-> ray visibility-> camera (uncheck)'' but checking it doesnt make any difference anyways)

EDIT: My question here lies on, why does this happen? The problem is solved, I can just increase the samples and activate the denoiser. The problem I have with this is that previewing with 32 samples is different than previewing with 100 or 500 samples. At one point I added a glass material and it acted as a noise trap and after removing the material, the noise trap persisted. I want to know why that happened. enter image description here

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    $\begingroup$ 32 samples is way too low. start with 500 $\endgroup$ – user1853 Feb 20 '19 at 17:49
  • $\begingroup$ Worth reading as well: blender.stackexchange.com/questions/70183/… $\endgroup$ – user1853 Feb 20 '19 at 18:05
  • $\begingroup$ Not gonna link more threads, you can find a lot about this under 'Get rid of/ Reduce Fireflies' $\endgroup$ – WhatAMesh Feb 20 '19 at 18:12
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    $\begingroup$ @WhatAMesh those are not fireflies. $\endgroup$ – user1853 Feb 20 '19 at 18:20
  • $\begingroup$ Isn't light portals a thing anymore? $\endgroup$ – Jackdaw Feb 20 '19 at 18:57