Houdini Engine for 3ds Max
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Data Marshalling

Table of Contents

Houdini Engine for 3ds Max is capable of marshalling data between Houdini and 3ds Max. This section will provide a description of both the inputs (from 3ds Max to Houdini) and the outputs (from Houdini to 3ds Max) that the plugin is capable of marshalling between the two programs.

Mesh Inputs

This section describes the data that gets marshalled into Houdini when you provide any geometry input to an HDA. The "3ds Max Input" column explains what the input is. The "Houdini Attribute" column provides the name of the attribute within Houdini that gets used for the input. The "Attribute Type" column indicates whether it is a point, vertex, primitive, or detail attribute. The "Description" column is used for any additional information.

3ds Max Input Houdini Attribute Attribute Type Description
Normals N Vertex Standard normal marshalling
Smoothing Groups hemax_sg Primitive Marshalls the smoothing groups for the mesh's faces
UV Layers uv ... uv99 Vertex The plugin will marshall any UV layers that it finds. The first UV layer is placed in the "uv" layer, and any subsequent uv layers are appended with a number indicating the layer
Soft Selection soft_selection Point Marshalls any soft selections the user has made
Colors Cd Vertex or Point Marshalls any vertex colors. This will be placed in either a vertex or point attribute depending on if the number of color inputs equals the number of points or equals the number of vertices
Alpha Alpha Vertex or Point Marshalls any vertex alpha values. This will be placed in either a vertex or point attribute depending on if the number of alpha inputs equals the number of points or equals the number of vertices
Illumination illumination Vertex or Point Marshalls any illumination values. This will be placed in either a vertex or point attribute depending on if the number of illumination inputs equals the number of points or equals the number of vertices
Material ID hemax_matid Primitive Marshalls the 3ds Max material ID for each face
Material Path hemax_material Primitive If there is a material on the input, this will marshall the material path

Mesh Outputs

This section describes the data that gets marshalled into a 3ds Max polygonal mesh from Houdini. The "Houdini Attribute" column indicates the name of the attribute that the plugin will look for when creating the display geometry. The "Attribute Type" column indicates what type of attribute that attribute can be. The "3ds Max Output" column indicates where that attribute will be used. The "Description" column is used for any additional information.

Houdini Attribute Attribute Type 3ds Max Output Description
N Vertex Specified Vertex Normals Standard normal marshalling
uv ... uv99 Vertex or Point UV Map The plugin will create a UV map for each UV layer.
hemax_sg Primitive Smoothing Groups Creates smoothing groups on each face of the 3ds Max mesh
hemax_matid Primitive Material IDs Creates material IDs on each face of the 3ds Max mesh
Cd Vertex or Point Color Map The plugin will create a color map. The number of faces in the map will always match the number of faces in the mesh. The number of vertices in the map will either be the number of points or the number of vertices (depending on if it is a vertex or point attribute).
Alpha Vertex or Point Alpha Map The plugin will create an alpha map. The number of faces in the map will always match the number of faces in the mesh. The number of vertices in the map will either be the number of points or the number of vertices (depending on if it is a vertex or point attribute).
Illumination Vertex or Point Illumination Map The plugin will create an illumination map. The number of faces in the map will always match the number of faces in the mesh. The number of vertices in the map will either be the number of points or the number of vertices (depending on if it is a vertex or point attribute).
hemax_material Detail Assigned material on object This allows you to specify the material to assign the object. See the Materials section for more information.