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This page provides information on the VRayScene node.

 

Page Contents

Table of Contents
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Overview

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VRayVRScene VRayScene loads a previously saved .vrscene file for rendering inside of V-Ray for Houdini.

 

 

UI Path: ||obj Network|| > Geometry node > V-Ray > V-Ray Scene

 

 

Main

 

Thus, VRayScene allows for assets to be shared between all platforms that run V-Ray.

UI Text Box
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The V-Ray Scene is loaded as a custom delayed-load primitive of type "VRaySceneRef" – please avoid passing it through a Pack SOP or an Assemble SOP to ensure proper handling of copying and instancing.


Main

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File (*.vrscene)

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 – Specifies

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the .vrscene

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 file to load.

Reload Scene – Reloads the scene file.

Flip Axis

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 – Controls which axis is used as a vertical - the Y or Z axes for the loaded vrscene. You can choose between:

None – No changes in the axes are applied.
Auto – It aligns the vertical axis of the vrscene with the vertical axis in the scene in cases where the vrscene was not exported from Houdini. Use the Auto mode when loading a USD file.


Z-up to Y-up – Switches the Y and Z axes.

Expand

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Primitives – When enabled,

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Add Objects – When enabled, adds objects from the included file(s).

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Viewport Preview

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a Primitive Group is created for each object in the .vrscene file. In the case of vrscenes coming from Maya, for example, each Shape node generates a new Primitive Group.

Expand All Primitives – When enabled, expands all primitives without hierarchy. Works only when Expand Primitives is enabled.

Allow Unpacking To Polygons – When enabled, allows unpacking to polygons. Works only when Expand Primitives is enabled, and Use Preview Faces is disabled.

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Viewport Preview

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Use Preview Faces – When enabled, uses

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a limited amount of preview faces.

Preview Faces

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 – Sets the number of preview faces

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to be displayed.

Animated

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Animation Overrides

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Preview – When enabled, a Poly-Reduced version of any animated present in the vrscene is displayed in the Viewport.

Proxy Preview Type – Specifies one of the following modes for previewing V-Ray proxies from the .vrscene:

Placeholder – Displays the proxies contained in the .vrscene file as simple placeholders with a fixed size.
Bounding Box – Displays a preview of the proxies contained in the .vrscene file using bounding boxes.
Preview – Displays a preview of the proxies contained in the .vrscene file using their automatically generated preview.

Preview Hair – When enabled, loads a preview for the hair.

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Animation Overrides

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Use Animation Overrides –

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Enables the use of animation overrides.

Playback Type

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 – Sets the way any animation in the .vrscene

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 plays within your current scene.

Loop

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 – The animation

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plays from the .vrscene

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 using the Anim Length

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 setting and if the time range in your current scene is longer than the length of the animation, it

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repeats the beginning of the animation again.
Once

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 – The animation in the .vrscene

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 plays just once and the end of the animation

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holds if the time range is longer than the length of the animation.
Ping-Pong

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 – The animation

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plays from the .vrscene

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 and if the end of the animation is reached, the animation

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plays in reverse towards the beginning of the animation and

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continues back and forth until the end of the time range.
Still

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 – The animation

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holds the Anim Start

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 frame for the duration of the time range.

Anim Speed

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 – The pace at which the animation

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plays. The default of 1

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plays at the speed for which the animation was created.

Anim Offset

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 – The number of frames shifted between the animation and the time range.

Anim Start

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 – The frame used for the beginning of the animation.

Anim Length

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 – The number of frames used to play the animation.

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Shader Overrides

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Use Shader Overrides – Enables the use of shader overrides.

Num. Overrides – Sets the number of overrides.

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Plugin Overrides

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Use Plugin

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Overrides – Enables the following parameters found in the Plugin Overrides tab.

Num. Mappings

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 – Specifies the number of plugins that are to be exported as materials.

Op. Path – Specifies the path to the material node.

Plugin Name – Specifies the name of the plugin that is to be overridden.

Snippet (*.vrscene)

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Filepath (*.vrscene) – (question)

 

 – Editor box expects data in the vrscene format. It allows code snippets for editing the scene override settings.

Filepath (*.vrscene) – Directory pointing to the .vrscene file that is used for the scene override.

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Import

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Import Material – Imports materials from the .vrscene file as nodes.

Unpack to Polygons – Generates a node network from the .vrscene geometry and materials.

Multi Material Mapping – Specifies how to handle multiple materials assigned to a single geometry.

Add Default Remapping – Generates default UV channel index remapping.

UV Mappings – Allows mapping of a UV ID during import (e.g. when importing a .vrscene file from 3ds Max) with a UV attribute name.

UV Index – Specifies a UV index that is mapped to a name when importing materials.

UV Name – Specifies a name to which the UV Index is mapped when importing materials.

Path Remapping – Remaps assets paths.

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Usage Example


This example demonstrates the import of a .vrscene from 3ds Max. The first picture shows the scene and the render in the VFB. Once imported in Houdini, the render is the same.


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The scene in 3ds Max and the render in VFB

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The imported .vrscene in Houdini and the render in VFB

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Notes

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  • When rendering or exporting a .vrscene with a heavy geometry or volumes in it that are not cached in an external file, a warning displays that heavy uncashed objects may slow down the rendering till the first pixel appears.
  • Path user attributes can be used as object paths.

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