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| <!----- | ||
| MaterialX NPR Shading Nodes v1.39 | ||
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| # MaterialX NPR Shading Nodes | ||
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| **Version 1.39** | ||
| Doug Smythe - Industrial Light & Magic | ||
| Jonathan Stone - Lucasfilm Advanced Development Group | ||
| May 1, 2024 | ||
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| # Introduction | ||
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| The MaterialX Specification and MaterialX Physically Based Shading Nodes documents describe a number of standard pattern and shading nodes that may be used to construct nodegraph-based shaders for physically based rendering in a variety of applications. However, there are certain operations that are desirable in non-photorealistic shading styles but which cannot be implemented within certain rendering constructs. It is also helpful conceptually to separate nodes primarily useful for photorealistic and non-photorealistic shading styles into separate libraries. | ||
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| This document describes a number of MaterialX nodes primarily applicable to non-photorealistic, or NPR, rendering. Rendering applications whose architecture cannot support these operations are not required to support these nodes. | ||
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| ## Table of Contents | ||
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| **[MaterialX NPR Library](#materialx-npr-library)** | ||
| [NPR Application Nodes](#npr-application-nodes) | ||
| [NPR Utility Nodes](#npr-utility-nodes) | ||
| [NPR Shading Nodes](#npr-shading-nodes) | ||
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| ## MaterialX NPR Library | ||
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| ## NPR Application Nodes | ||
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| <a id="node-viewdirection"> </a> | ||
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| * **`viewdirection`**: the current scene view direction (e.g. from the viewing/camera position to the current shading position). If `viewdirection` is used in a PBR shading context, it should be noted that this would be the same as the incident ray direction for primary ("camera") rays but **not** for secondary/reflection rays. This node must be of type vector3. | ||
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| * `space` (uniform string): the space in which to return the view vector direction, defaults to "world". | ||
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| <a id="node-lightdirection"> </a> | ||
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| * **`lightdirection`**: the predominant incoming light direction, as defined by the shading environment. This node must be of type vector3. | ||
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| * `space` (uniform string): the space in which to return the lighting vector direction, defaults to "world". | ||
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| ## NPR Utility Nodes | ||
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| <a id="node-facingratio"> </a> | ||
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| * **`facingratio`**: returns the geometric facing ratio, computed as the dot product between the view direction and geometric normal. Output is a float between 0.0 and 1.0. | ||
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| * `viewdirection` (vector3): the viewing direction, defaults to the value of the "Vworld" (world space view direction) geometric property. | ||
| * `normal` (vector3): the surface normal vector, defaults to the value of the "Nworld" (world space view direction) geometric property. This vector is expected to be prenormalized to length 1.0. | ||
| * `faceforward` (boolean): description needed; default is false. | ||
| * `invert` (boolean): description needed; default is false. | ||
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| ## NPR Shading Nodes | ||
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| <a id="node-gooch-shade"> </a> | ||
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| * **`gooch_shade`**: Compute Gooch Shading ([https://en.wikipedia.org/wiki/Gooch_shading](https://en.wikipedia.org/wiki/Gooch_shading) [https://users.cs.northwestern.edu/~ago820/SIG98/gooch98.pdf](https://users.cs.northwestern.edu/~ago820/SIG98/gooch98.pdf)). Output type "surfaceshader". | ||
| * `warm_color` (color3): the "warm" color for shading, defaults to (0.8, 0.8, 0.7) in the "lin_rec709" colorspace. | ||
| * `cool_color` (color3): the "cool" color for shading, defaults to (0.3, 0.3, 0.8) in the "lin_rec709" colorspace. | ||
| * `specular_intensity` (float): the intensity of the specular component. Defaults to 1.0. | ||
| * `shininess` (float): the specular power typically ranging from 1 to 256, defaults to 64. | ||
| * `light_direction` (vector3): the incoming predominant lighting direction in world space, defaults to (1.0, -0.5, -0.5). |
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