Learn how to use a modifier to choose object rendering options.
- [Instructor] To control the rendering properties of an object, such as whether or not it casts shadows, normally you would go into the object properties dialog, but unfortunately, Arnold does not respect the object properties dialog. To control the render properties of an object in the Arnold renderer, you need to add a modifier called Arnold properties. An example of when you would need that is when you've got a matte painting and that's a geometric object in the scene that provides a backdrop but is not supposed to cast shadows or otherwise interact with the lighting.
I've got one actually hidden in the scene. Let's see what the rendering looks like without the matte painting first. I'll click on the active shade button and render the physical camera view and we've got light coming from the backlight outside the room. Let's clone this window so we can compare it. Click on clone rendered frame window, and here's our clone, and now un-hide the matte painting. Go into the layer explorer, and that's up here.
Layer explorer, and in the layer explorer there is a layer that's named matte painting layer. Let's un-hide it by clicking on the eye icon on the left and the matte painting is now visible in the background. It has affected the lighting, we can see that more clearly if we place these images side by side. Here's one where no shadows are being cast by the matte painting, and over here we do have shadows being cast, and that's diminishing the amount of light.
We'll correct that. Let's select the matte painting, and it's here in the view, we can select in the perspective view. Go over to the modify panel, and then add a modifier from the list, and it's gonna be Arnold properties. Open up general properties, and we've got visibility, shadows, and general. Enable the shadows section and we want to turn off all these options so it won't cast shadows, it won't receive shadows, and it won't shadow itself.
We can see that happen in the active shade window here, as we enable cast shadows and disable it, we can actually see the amount of light increase when shadows are disabled. Those are the properties we needed to set. I can close these windows, and in fact I'll hide that matte painting. Go back into the layer explorer and re-hide the matte painting layer. That's how to use the Arnold properties modifier to control the rendering properties of any object.
- Arnold rendering concepts
- Arnold lights such as quad, spot, and distant
- Modifying Arnold object properties
- Filtering light with the gobo filter modifier
- Image-based lighting with Skydome
- Daylight simulation with Physical Sky
- Arnold Standard Surface material parameters
- Diffuse, opacity, and bump mapping
- Rendering refractions with Transmission
- Building an Arnold shading network
- Test rendering with utility map
- Mesh subdivision and displacement at render time
- Atmospheric perspective with scene environment fog
- Rendering a spherical environment with VR Camera