While we're talking about shading, I wanted to briefly cover a glass material problem that you might
run into and how to fix it, basically let's take this head and apply a new material and create a glass
preset so of the shader standard surface.
And if I got presets and I go down here to glass and I'm going to choose replace place that's off screen
here and you can see it kind of, you know, looks like glass down the viewport.
You can see through it here.
And if we turn on the Arnold render view, we can see that it does indeed.
Kind of look like glass, and so that might seem like you're all done there, but the shadow is, you
know, maybe too dark, like the light should go through the the glass a little more.
So there's a couple different things you can do with glass surface.
You can turn on thin wall.
So it's going to make the object to look a lot thinner.
So it's a very thin piece of glass.
And if you decrease the opacity, nothing's changing.
And why is that?
Well, that has to do with one issue here, that if we select the geometry and go into the head shape
or the shape of the head, it'll be called whatever your piece of geometry is.
And then shape shape is a technical term for a node that's common in Maya.
And if we go down to the Arnold tab here, you can see that we have opaque turned on.
And this is the one little thing that you have to look out for when you're using a glass shader is to
uncheck that.
So now you can see that indeed there is no shadow.
Well, why is that?
And what if we want some cosmetics here and cosmetics are about refraction through a material onto a
surface.
So that'll make sense here in a second when I turn on a color for transmission.
So let's turn it maybe something to blue.
Now you can see what would really be happening if this was a blue plate piece of glass.
It would be refracting that color and creating this Kostic kind of transmission onto the surface here.
So the other thing to consider is if you remember before when we lowered the opacity, nothing happened.
But now if we lower the opacity, you can start to see through the subject the that piece of geometry
and the cost exchange as well.
You can see the areas of different thickness have a different amount of caustic transmission on them.
So that's one thing to just look out for when you're using glass preset to uncheck the opaque from the
Arnold shape area here.
Thanks for watching.
I'll see in the next lesson.