WEBVTT

00:00.770 --> 00:05.960
While we're talking about shading, I wanted to briefly cover a glass material problem that you might

00:05.960 --> 00:12.170
run into and how to fix it, basically let's take this head and apply a new material and create a glass

00:12.170 --> 00:15.050
preset so of the shader standard surface.

00:15.440 --> 00:20.750
And if I got presets and I go down here to glass and I'm going to choose replace place that's off screen

00:20.750 --> 00:24.860
here and you can see it kind of, you know, looks like glass down the viewport.

00:24.860 --> 00:26.060
You can see through it here.

00:26.420 --> 00:32.030
And if we turn on the Arnold render view, we can see that it does indeed.

00:34.000 --> 00:42.460
Kind of look like glass, and so that might seem like you're all done there, but the shadow is, you

00:42.460 --> 00:47.920
know, maybe too dark, like the light should go through the the glass a little more.

00:47.920 --> 00:51.790
So there's a couple different things you can do with glass surface.

00:51.800 --> 00:52.810
You can turn on thin wall.

00:52.810 --> 00:55.750
So it's going to make the object to look a lot thinner.

00:55.750 --> 00:57.430
So it's a very thin piece of glass.

00:57.910 --> 01:01.830
And if you decrease the opacity, nothing's changing.

01:02.470 --> 01:04.100
And why is that?

01:04.120 --> 01:10.120
Well, that has to do with one issue here, that if we select the geometry and go into the head shape

01:10.990 --> 01:15.400
or the shape of the head, it'll be called whatever your piece of geometry is.

01:15.400 --> 01:20.430
And then shape shape is a technical term for a node that's common in Maya.

01:20.950 --> 01:26.170
And if we go down to the Arnold tab here, you can see that we have opaque turned on.

01:26.620 --> 01:32.650
And this is the one little thing that you have to look out for when you're using a glass shader is to

01:32.650 --> 01:33.440
uncheck that.

01:33.730 --> 01:38.090
So now you can see that indeed there is no shadow.

01:39.130 --> 01:40.600
Well, why is that?

01:40.600 --> 01:49.480
And what if we want some cosmetics here and cosmetics are about refraction through a material onto a

01:49.480 --> 01:50.020
surface.

01:50.030 --> 01:55.170
So that'll make sense here in a second when I turn on a color for transmission.

01:55.660 --> 01:57.910
So let's turn it maybe something to blue.

01:58.000 --> 02:03.370
Now you can see what would really be happening if this was a blue plate piece of glass.

02:03.370 --> 02:11.600
It would be refracting that color and creating this Kostic kind of transmission onto the surface here.

02:12.490 --> 02:17.800
So the other thing to consider is if you remember before when we lowered the opacity, nothing happened.

02:18.160 --> 02:23.980
But now if we lower the opacity, you can start to see through the subject the that piece of geometry

02:23.980 --> 02:26.470
and the cost exchange as well.

02:26.480 --> 02:32.470
You can see the areas of different thickness have a different amount of caustic transmission on them.

02:32.890 --> 02:41.230
So that's one thing to just look out for when you're using glass preset to uncheck the opaque from the

02:41.260 --> 02:44.350
Arnold shape area here.

02:44.940 --> 02:45.520
Thanks for watching.

02:45.550 --> 02:46.480
I'll see in the next lesson.