Vray Glass Material Blocking Light From Scene

[richardcousins]

I've got a simple room with the sun and sky system, its lit fine ad the 2 windows has vray lights as sky portals. Now if I use a glass material on the windows they block out all the light.

 

Why is this happening?

[richardcousins]

I've made sure affect alpha is checked and thats allowed light to come through but now the colour behind the glass is grey, I can see the vray sky anymore why is this?

[SkylineArch]

just set the geo itself to not cast shadows

[richardcousins]

I cant see an option to turn off cast shadows in the vray object properties.

[SkylineArch]

assuming you are in Max, just uncheck the object property to cast shadows, it's not in the vray settings

 

you can also turn off receive shadows if needed

[richardcousins]

I've trid that as well and all I get is a grey behind the glass and cant see the sky.

 

The lights coming in through the glass. I also have a sky portal set up on the window, I dont know if that'll effect things.

[richardcousins]

It literally goes from white like when no glass is there and then when I add the glass object it goes grey.

[Chris MacDonald]

You know a screenshot of your render and glass material would really help?

[richardcousins]

This is my render, I've switched the sun and sky for a hdri map in a dome light and this is the result. Would you say thats a good lighting setup?

 

[Chris MacDonald]

...so this isn't the problem you were describing then?

[richardcousins]

Here is the setup where I have the issue.

 

So using vray sun & sky.

 

The window glass is a box with a shell modifier to mimic the thickness of the glass.

 

Now no matter what glass material I use it goes grey. I cant see the sky outside the window anymore

 

 

 

 

 

Also from a lightness and quality perspective which do you think gives the better result, hdri map or sun n sky?

[Chris MacDonald]

What's your glass material setup look like?

 

Are the normals on the box facing outwards?

[richardcousins]

The normals are pointing outwards. I'm just trying it with a basic clear material, reflection set to white and also refraction set to white, affect shadows is checked. Doesnt matter if I create a plane or a box as soon as I put geometry where the glass should be I cant see the sky anymore, it goes gre or black, the scene is still lit but there just no sky visible behind the glass

[Chris MacDonald]

Does this happen in a new scene? If you're unwilling to post a screenshot, perhaps you might be coerced into providing your scene via dropbox or similar? It's very, very hard to diagnose a problem when we don't have access to all of the possible things that could be causing it.

[Nicolai Bongard]

One thing that may be relevant is that your camera is angled downwards. Thus you will probably see the grey ground instead of the sky? Try to angle your camera a bit up and see if you can see the sky/horizon then?

[mattcooper]

Could it be the IOR of the glass?

Also check that the sky is visible in refraction + reflection.

[richardcousins]

Here is a link to the scene file. Made in max 2016 and vray 3.40 http://jmp.sh/anBipG9

[Chris MacDonald]

You have environment overrides checked, both GI and reflection & refraction.