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Copy file name to clipboardExpand all lines: documents/Specification/MaterialX.Specification.md
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An **Element** is a named object within a MaterialX document, which may possess any number of child elements and attributes. An **Attribute** is a named property of a MaterialX element.
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A **Node** is a function that generates or operates upon spatially-varying data. This specification provides a set of standard nodes with precise definitions, and also supports the creation of custom nodes for application-specific uses. The interface for a node’s incoming data is declared through **Inputs**, which may be spatially-varying or uniform, and **Tokens**, which are string values that can be substituted into filenames declared in node inputs.
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A **Node** is a function that generates or operates upon spatially-varying data. This specification provides a set of standard nodes with precise definitions, and also supports the creation of custom nodes for application-specific uses. The interface for a node’s incoming data is declared through **Inputs**, which may be spatially-varying or uniform, and **Tokens**, which are string values that can be substituted into filenames declared in node inputs. The interface for a node's outgoing data is declared through one or more **Outputs**; a node's Inputs, Tokens and Outputs are collectively referred to as the node's **Ports**.
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A **Pattern** is a node that generates or processes simple scalar, vector, and color data, and has access to local properties of any geometry that has been bound.
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### Custom Node Declaration NodeDef Elements
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Each custom node must be explicitly declared with a <nodedef> element, with child <input>, <token> and <output> elements specifying the expected names and types of the node’s inputs and output(s).
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Each custom node must be explicitly declared with a <nodedef> element, with child <input>, <token> and <output> elements specifying the expected names and types of the node’s ports.
Copy file name to clipboardExpand all lines: documents/Specification/MaterialX.StandardNodes.md
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*`viewdir` (vector3): the view direction determining the value sampled from the projected equiangular map.
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*`rotation` (float): the longitudinal sampling offset, in degrees.
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<aid="node-hextiledimage"> </a>
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***`hextiledimage`**: samples data from a single image, with provisions for hex-tiling and randomizing the image across uv space.
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*`file` (uniform filename): the URI of an image file. The filename can include one or more substitutions to change the file name (including frame number) that is accessed, as described in the [Filename Substitutions](./MaterialX.Specification.md#filename-substitutions) section in the main Specification document.
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*`default` (color<em>N</em>): a default value to use if the `file` reference can not be resolved (e.g. if a <geomtoken>, [interfacetoken] or {hostattr} is included in the filename but no substitution value or default is defined, or if the resolved file URI cannot be read). The `default` value must be the same type as the `<hextiledimage>` element itself. If `default` is not defined, the default color value will be 0.0 in all channels.
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*`texcoord` (vector2): the name of a vector2-type node specifying the 2D texture coordinate at which the image data is read. Default is to use the current u,v coordinate.
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*`tiling` (vector2): the tiling rate for the hexagon tiles along the U and V axes. Default value is (1.0, 1.0).
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*`rotation` (float): per-tile rotation randomness in degrees. Default is 0.0.
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*`rotationrange` (vector2): [min, max] range in degrees used to randomize rotation for each tile. Default is (0.0, 360.0).
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*`scale` (float): per-tile scale randomness multiplier applied to tile size. Default is 1.0.
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*`scalerange` (vector2): [min, max] range of scale multipliers used to randomize tile scale. Default is (0.5, 2.0).
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*`offset` (float): per-tile translation randomness in UV units. Default is 0.0.
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*`offsetrange` (vector2): [min, max] range of offset values in UV units used to randomize tile positions. Default is (0.0, 1.0).
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*`falloff` (float): falloff width used to blend neighboring tiles at their edges; larger values produce smoother blends. Default is 0.5.
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*`falloffcontrast` (float): contrast applied to the falloff blending to sharpen (values >1) or soften (values <1) transitions. Default is 0.5.
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*`lumacoeffs` (uniform color3): the luma coefficients of the current working color space; if no specific color space can be determined, the ACEScg (ap1) luma coefficients [0.2722287, 0.6740818, 0.0536895] will be used. Applications which support color management systems may choose to retrieve the luma coefficients of the working colorspace from the CMS to pass to the <luminance> node's implementation directly, rather than exposing it to the user.
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<aid="node-triplanarprojection"> </a>
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***`triplanarprojection`** (NG): samples data from three images (or layers within multi-layer images), and projects a tiled representation of the images along each of the three respective coordinate axes, computing a weighted blend of the three samples using the geometric normal.
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*`tangent` (vector3): surface tangent vector, defaults to the current world-space tangent vector.
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*`bitangent` (vector3): surface bitangent vector, defaults to the current world-space bitangent vector.
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<aid="node-hextilednormalmap"> </a>
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***`hextilednormalmap`**: samples data from a single normalmap, with provisions for hex-tiling and randomizing the normalmap across uv space.
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*`file` (uniform filename): the URI of an image file. The filename can include one or more substitutions to change the file name (including frame number) that is accessed, as described in the [Filename Substitutions](./MaterialX.Specification.md#filename-substitutions) section in the main Specification document.
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*`default` (vector3): a default value to use if the `file` reference can not be resolved (e.g. if a <geomtoken>, [interfacetoken] or {hostattr} is included in the filename but no substitution value or default is defined, or if the resolved file URI cannot be read). Default is (0.5, 0.5, 1.0).
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*`texcoord` (vector2): the name of a vector2-type node specifying the 2D texture coordinate at which the image data is read. Default is to use the current u,v coordinate.
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*`tiling` (vector2): the tiling rate for the hexagon tiles along the U and V axes. Default value is (1.0, 1.0).
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*`rotation` (float): per-tile rotation randomness in degrees. Default is 0.0.
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*`rotationrange` (vector2): [min, max] range in degrees used to randomize rotation for each tile. Default is (0.0, 360.0).
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*`scale` (float): per-tile scale randomness multiplier applied to tile size. Default is 1.0.
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*`scalerange` (vector2): [min, max] range of scale multipliers used to randomize tile scale. Default is (0.5, 2.0).
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*`offset` (float): per-tile translation randomness in UV units. Default is 0.0.
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*`offsetrange` (vector2): [min, max] range of offset values in UV units used to randomize tile positions. Default is (0.0, 1.0).
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*`falloff` (float): falloff width used to blend neighboring tiles at their edges; larger values produce smoother blends. Default is 0.5.
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*`strength` (float): Controls how strongly the sampled normal map affects the final normal. A value of 0.0 leaves the surface normal unchanged, 1.0 applies the sampled normal at full strength, and values >1.0 amplify the normal perturbation. Default is 1.0.
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*`flip_g` (boolean): If true, negate (flip) the green (G) channel of the sampled normal map to accommodate different tangent-space conventions (handedness). Default is false.
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*`normal` (vector3): surface normal; defaults to the current world-space normal.
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*`tangent` (vector3): surface tangent vector, defaults to the current world-space tangent vector.
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*`bitangent` (vector3): surface bitangent vector, defaults to the current world-space bitangent vector.
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<aid="node-creatematrix"> </a>
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***`creatematrix`**: build a 3x3 or 4x4 matrix from three vector3 or four vector3 or vector4 inputs. A matrix44 may also be created from vector3 input values, in which case the fourth value will be set to 0.0 for in1-in3, and to 1.0 for in4 when creating the matrix44.
doc="Computes anisotropic surface roughness as defined in the OpenPBR specification.">
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<nodedefname="ND_open_pbr_anisotropy"node="open_pbr_anisotropy"nodegroup="pbr"doc="Computes anisotropic surface roughness as defined in the OpenPBR specification.">
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