This only applies when Double Sided is on. Instead of using the Diffuse Gain for controlling the intensity of the diffuse transmission, we use the Transmit Gain. By default, it uses the Diffuse Color but choosing a different color provides you with a way to make the backside of 2D objects appear differently. When Use Diffuse Color if off, this sets the back color (the color for the back side). By default, this is on to use the Diffuse Color for the back color.
This is so the backface will be shaded instead of black. If on, illuminate both sides of the surface for this diffuse lobe, that is, this will illuminate the surface whose normal is pointing away from the camera (2-dimensional objects) as well.
If this is not set, it will use the global bump normal specified in the Properties section near the bottom of this page. Combining diffuse exponent with Oren Nayar roughness does not make sense so it will be ignored when roughness is > 0.0.īump mapping is a great way to fake the appearance of physical detail using shading instead. For example, on the moon surface, you can set a high exponent to produce a sharper falloff.ĭiffuse exponent only applies to the Lambertian diffuse, that is, when roughness is 0.0. 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.
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