Architectural Window Glass - White or Black circle in IOR Reflection

Question

I have modelled a window using a glass that has thickness (about 10mm). Normals face the correct way.

I have researched glass shaders to make sure light passes throught the material and also keeps relections based on the angle to object.

My issues is that I get a White Circle that appears when viewing the glass head on. The circle changes in size related to IOR I have set.

If I make the IOR in the material settings higher the circle gets smaller but the reflections get weaker! I want reflections as it looks nice BUT I don't want a big white circle in my glass reflection.

I think this is all related to IOR.

Does anyone know what this circle is? it appears even when I just light the scene with the default HDRI enviroment textures and have no other lights.

White Circle is the circle in the glass window***

Thank you for any help. Ian

White Circle is the circle in the glass window. Its not part of my model and is annoying. The circle is not pure white. Its quite big. — Ian, Feb 09 '21 at 18:43
If you plug the Fresnel node straight into the output, (or Node Wrangler Shift-click the node) I suspect you will see that is the circle.. the boundary, dependent on angle of view, and IOR, between refraction and reflection. — Robin Betts, Feb 09 '21 at 19:53
I’m pretty sure he’s talking about the 3D cursor. You can shift + rmb anywhere to place it somewhere else or simply disable it in the viewport overlay settings at the top (next to the render views) — bstnhnsl, Feb 09 '21 at 20:43
Have changed the Fresnel value and the white circle is now bigger and can be seen in the window glass reflection. I don't want this but I want some real life reflections in my windows of the environment. — Ian, Feb 10 '21 at 19:59
Does this answer your question? Strange sphere in my glass surfaces? — Allen Simpson, Apr 20 '21 at 01:47
Old post but I had this problem too a while ago. The white circle is a reflection of your light. Point light, spot light or whatever it is. See this video how to remove it — lambi, May 15 '22 at 08:47

Architectural Window Glass - White or Black circle in IOR Reflection

0 Answers0