This page provides information on V-Ray render geometry settings integrated in Solaris's Render Geometry Settings LOP node.

 

Overview


V-Ray render geometry settings are located in the V-Ray tab of the Render Geometry Settings LOP. The settings are equivalent to the standard V-Ray for Houdini Object Properties applied over Geometry nodes in 'regular' Houdini. The following plugins are used under the hood:

  • GeomDisplacedMesh → for Displacement and Subdivision
  • MtlWrapper → for Matte properties
  • MtlRenderStats → for Visibility properties
  • LightMesh → for Mesh Light settings

The render geometry settings are applied as primvars to the USD primitives. The naming of the exported primvars is the same as the parameter name, e.g.:

  • V-Ray → Main → Renderable exports “primvars:vray:ObjProperties_renderable”.
  • V-Ray → Mesh Light → Enabled exports “primvars:vray:LightMesh_enabled”

The render geometry settings can be applied both to live geometry, and to referenced/sub layered primitives, e.g.:

over "cube1"
{
    bool primvars:vray:LightMesh_enabled = 1 (
        interpolation = "constant"
    )
}

 

UI path: ||stage|| > Rendering > Render Geometry Settings > V-Ray

 

 

Workflow


1. Either import or create a Geometry LOP node (e.g. “box”).

2. Add a Render Geometry Settings LOP.

3. Go to the V-Ray tab and enable any option.

4. Switch to the V-Ray Hydra delegate.

When working with Solaris, make sure to specify the correct Primitive path in the Render Geometry Settings LOP when attempting to apply those parameters.

Download Example Files

 

 

 

Creating and Setting Attributes


The parameters that correspond to a USD attribute have a pop-up menu that controls how the LOP node authors the attribute:

Set or Create – Sets the attribute to a given value, regardless of whether the attribute previously existed or not.

Set if Exists – Sets an attribute to the given value only if it previously existed. Use this option to make sure the attribute is set on primitives of the correct type.

Block – Makes the attribute appear to not exist so it takes on its default value.

Do Nothing – Does not affect the attribute, i.e. does not create or change the attribute in any way.

 

 

V-Ray Tab


Main

This tab allows you to adjust the render settings per object-basis.

 

Displacement and Subdivision

This tab contains settings for controlling displacement and subdivision on objects.

 

Mesh Light

This tab contains settings for controlling mesh lights.

 

Matte/Shadow

This tab contains settings for controlling matte/shadow.

 

Visibility

This tab contains settings for controlling visibility of the object, e.g. how transparent it is to different rays or whether it casts shadows.

 

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