When roughness is > 0.0, Oren Nayar model is used instead.ĭiffuse exponent controls the diffuse falloff. When roughness is 0.0, PxrSurface uses Lambertian model to calculate the diffuse response. This is where a wood color texture would go, for example.ĭiffuse roughness is how you would simulate a powdery surface like dried clay or dust. Below are examples at 0.0, 0.5, and 1.0 gain for a 50% gray material.Ĭolor is typically where textures or patterns are connected to create color for opaque objects. You may also drive this with another pattern to show things like fading or wetness (where liquid darkens a surface). Gain is the weight applied to the diffuse parameters. These are often used to define primary color attributes for opaque objects wood textures, label text, polka dots, or more, you can find them all connected here. The diffuse parameters control the look of basic diffuse reflection. For example: Choosing GGX as a specular model will mean all layers will be GGX for that parameter. These are globally obeyed for all layers. Italicized parameters are not able to be layered or overridden.Bold Face parameters are layerable, able to be overridden per layer.The results of these settings are unchanged. ![]() We recommend this material when you know you will be layering. PxrLayerSurface is designed to better illustrate which parameters are not able to be overridden in a layer by including only parameters that are global. In the parameters below, some of them can be overridden by a PxrLayer when connected to the Input Material or through a PxrLayerMixer. It's by combining these lobe settings that you can make just about any material you imagine. However, as different lobes are activated and tweaked, the material will change looks. Pay special attention to notes about performance considerations as well as hints on what combinations will be useful for particular effects.īelow you will find each effect or lobe of the material has been separated into its own section to help users define the area they wish to learn about. We discuss all the different settings and their relevance to making certain materials. Layering provides limitless possibilities.Īs an artist, being able to choose a single material for all your shading eliminates guesswork and allows RenderMan to optimize as needed.Controls are conveniently labeled as "Artistic" and "Physical".Art direction becomes natural without workarounds.Artists can selectively "break" energy conservation.Flexible controls are not required to result in something physically plausible.Physically based presets provided to get you started.A single material handles all your looks like:.As such there are some important benefits to this material: This is the same material model used in Pixar Animation Studios' feature animation. Rendering surfaces in RenderMan relies on a layerable material called PxrSurface.
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