Understand the processes and methods required to create transparent and semi-opaque surfaces using Arnold in Maya 2019. In this video, George discusses the special attributes that need to be set on object geometry in order to render transparency in Arnold for Maya. He shows where in the Attribute Editor these flags are located.
- [Instructor] Now, when it comes to transparency, Arnold is a little bit unique in how it handles it. So let's take a look at how to create opaque, transparent, and refractive surfaces in Arnold. So here I have a simple scene here, and let's go ahead and just render this. So I'm going to go into Arnold RenderView, and then just turn on Run IPR. This should show us the sphere and the cylinder.
So I'm going to select the sphere and we're going to apply a new material to it. So I want to make sure I'm in my rendering menus, and then we're going to select Lighting Shading, Assign New Material. I'm going to go into Arnold and let's find aiStandardSurface. Apply that, this should turn a different color. Now, let's take a look at the attribute editor for this. So I want to make sure I have that sphere selected, and let's go over to that aiStandardSurface2. Now this is the surface for this particular object so if I wanted to, I could change the color and all that but really what I want to do is I want to make it opaque and then I also want to dial in refractivity.
Now the first thing I want to do is show you how to make an object transparent. And that's under the geometry tab. We have an opacity control. Now if I turn this down, notice how it changes in the view port but it does not change in the render. Now here's the little trick that's really important. We have to go over to the shape node for this object so here its pSphereShape1. And if you scroll down there should be an Arnold tab.
So I'm going to go ahead and roll that out and then there's a little button here that says opaque. Watch what happens when I turn opaque off. Boom, there we go. So now I'm getting transparency. So opacity or transparency is decided on a per object basis so you need to make sure that this is clicked off for any object you want to have transparency. So I'm going to go back over to my surface here and let's go back down to the geometry tab here and as you can see, I can turn opacity up or down.
Now in addition to this, we also have another roll out called transmission and this controls the refractivity of the surface. So I'm going to turn my opacity somewhere around the middle here so we can kind of see through this but I really want to see how transmission works. Now transmission works with two values here. We have index of refraction which is actually in specularity and then we have the weight of transmission. So if I turn this transmission all the way up, notice what happens.
We get refractivity in the surface so we're getting this blue object here refracting along the edge here. Now we can see this a little bit better if I make this object completely opaque. If I turn opacity all the way up, you can see this effect. And then if we turn that up, it makes it very easy to see how index of refraction works so as index of refraction goes up, the position of this object moves around.
So as you can see that I can actually get a quasi transparent effect here, just by allowing the transmission of light through and that's what the index of refraction less than one. Now as soon as it goes above one, notice how this particular part of the object is actually opaque. But we can control that by going back down to opacity here in the Geometry tab and dialing that down just a bit.
So the combination of these three are really how you're going to get your transparent and refractive effect. Opacity determines the overall transparency of the surface. Transmission controls how light passes through that surface and then the index of refraction determines how much of that transmission is refracted. Now all of this is dependent upon going over here to the shape node and making sure that we have opaque toggled on.
So hopefully that gives you a little bit more insight in how to create transparent and refractive objects in Arnold.
- Getting familiar with the Maya interface
- Configuring viewports and workspaces
- Selecting and manipulating objects
- Creating hierarchies and layers in scenes
- Creating polygonal models
- Modeling and refining polygonal meshes
- Working with subdivision surfaces
- Sculpting a basic landscape
- NURBs modeling
- Creating and applying materials and textures
- Adding lights and cameras to a scene
- Rendering in Arnold
- Animating in Maya
Skill Level Beginner
1. The Maya Interface
2. Select and Manipulate Objects
3. Organize Maya Scenes
4. Create Polygonal Models
5. Model Polygonal Meshes
6. Refine Polygonal Meshes
7. NURBS Modeling Techniques
8. Refine NURBS Models
9. Create Materials
10. Apply Materials and Textures
11. Render in Maya
12. Render in Arnold
13. Animate in Maya
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