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I did a test and wanted to make sure I was right on. The following image has three windows. The first one has one sheet of glass, the second window two sheets, and the third two sheets also.

The normals, and by that I mean that the "blue" of the default material in SU needs to face in, are as follows:

Window 1: blue is on shadow side of wall.
Window 2: blue's are facing each other (not sure how to explain that very well...I hope you know what I mean)
Window 3: blue's are both facing the same direction, i.e. they're on the shadow side of sheet of glass.

Is this what you guys do everytime you do a window in SU? It seems to me that without thickness, glass doesn't render correctly.

Later y'all.

Deesee

I just noticed my doodles are wrong. For window 2 the arrows should be pointing towards each other, not away from each other.

number 2 is the correct way mate, backfaces should point inward

Got it. Thanks!!

Why doesn't 1 work? Does Dielectric need 2 planes for the 2 faces of the glass?

That's a good question. I haven't the slightest clue. I'm relatively new to all this and don't know much about the technical stuff. It's like my microwave oven, as long as it works, I'm happy.

I wish it did work with just one sheet of glass...makes modeling a little easier, but its no big deal.

Perhaps the other gurus in here can answer.

well if you were to use 1 then the light would pass though the one side and be trapped as the light passes thorough the correct side but then hits the back face of the other piece

So what explains the two "lit areas" on the shadow. I'm talking about the lit areas above and below the light coming through window 2.

It seems to me that some light is passing through, but its coming through very dim and somehow the angle is refracted or "moved" a bit.

Think of it like this;
A ray of light is traveling in air, it then passes thru the front face of glass so now it is traveling in glass untill it passes the bacface of glass or a new frontface of a third material.
2 is correct.
In 1 and 3 the light passing the window thinks it is inside solid glass untill it hits the ground. 1 and 3 are physicaly impossible situations, so they render incorrectly. It is easy to make impossible situations in SU, so you have to be carefull when building the modell.
Did this help?
Sheik

Makes sense Sheik.

well said sheik

Hi,

I've been experimenting with glass and noticed that when looking through the glass I cannot see the light landing on the floor on the other side of the glass. Is this a bug or am I doing something wrong? I am using two faces for the glass and both front faces are pointing outward, or away from each other.

This is a known bug in MR. I believe it's been taken care of in 1.0.

Thanks deesee. I hadn't seen it discussed before, and I wasn't sure if it was a general MR bug, or a su2mxs bug.