Maya to Houdini Light Transfer (Maya/Arnold/Houdini/Mantra/Python)

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Features

• Compatible with 2 Houdini Renderers.
  • Mantra
  • Arnold
• Adjust Scene Scale.
• No duplication of Lights in Houdini while Importing it multiple times.
• Works with Python 2 and 3 both.

Software Requirement

• Maya 2018+ with Arnold
• Houdini 16+ with Mantra or Arnold

Installation

• Open "ui_launcher.py" in notepad or equivalent software.
• Replace "path" variable with your script folder path.
• Save script in Maya and Houdini Shelf.

How to use

• Maya

  • Drag and select all the lights from the viewport.
  • Run the script.
  • Click "Browse" button, and save Json file to desired location. (Default path is current Maya workspace "data" folder.)
  • Click "Export Lights" button.

• Houdini

  • Run the script.
  • Click "Browse" button, and load the exported Json file. (Default path is current Houdini workspace folder.)
  • Tick desired Renderer.
  • Set "Scene Scale" if required. It will adjust Translate, Scale, Exposure and Radius. (Default value is 0.1)
  • Click "Import Lights" button.

Maya Arnold Lights - Houdini Mantra Lights [Condition]

• Point Light - Point    [if radius == 0]
• Point Light - Sphere    [if radius > 0]
• Directional Light - Distant    [if angle == 0]
• Directional Light - Sun    [if angle > 0]
• Spot Light - Point    [if radius == 0]
• Spot Light - Sphere    [if radius > 0]
• Area/Quad Light - Grid
• Area/Disk Light - Disk
• Area/Cylinder Light - Line    [if scaleX and scaleZ == 0]
• Area/Cylinder Light - Tube    [if scaleX or scaleZ > 0]
• Skydome Light - Environment Light

What is working?

• Mantra

  • Working

    • Light Types

      • Point Light
      • Directional Light
      • Spot Light
      • Quad Light
      • Disk Light
      • Cylinder Light
      • Skydome Light

    • All Lights (Parameters)

      • Viewport Visibility
      • Intensity
      • Exposure
      • Color
      • Color Temperature
      • Cast Shadows
      • Shadow Density
      • Light Group

    • Point Light

      • Radius
      • Normalize
      • Shadow Color

    • Directional Light

      • Angle
      • Shadow Color

    • Spot Light

      • Cone Angle
      • Penumbra Angle
      • Radius
      • Normalize
      • Shadow Color

    • Quad Light

      • Size
      • Normalize
      • Shadow Color

    • Disk Light

      • Size
      • Normalize
      • Shadow Color

    • Cylinder Light

      • Size
      • Normalize
      • Shadow Color

  • Partially Working

    • All Lights (Parameters)

      • All Light Contributions    [Checkbox instead of Slider, 0.5 or greater will turn on, else turn off.] 
        • Camera
        • Diffuse
        • Specular
        • Sss
        • Indirect
        • Volume
        • Transmission

    • Spot Light

      • Dropoff    [Approximation]

    • Quad Light

      • Spread    [Approximation]
      • Soft Edge    [Approximation]
      • Roundness    [Checkbox instead of Slider, 0.5 or greater will convert to Disk Light] 
      • Texture Map    [Should be Linear EXR, and directly connected to light.] 

    • Disk Light

      • Spread    [Approximation]

    • Skydome Light

      • HDRI Map    [Should be Linear EXR, and directly connected to light.]

  • Not Working

    • Light Types

      • Photometric Light    [Consider Future Release.]
      • Light Portal    [Consider Future Release.]
      • Physical Sun and Sky    [Consider Future Release.]
      • Mesh Light    [No Plans.]

    • All Lights (Parameters)

      • Cast Volumetric Shadows    [Parameter doesn't exist.]
      • Volume Samples    [Parameter doesn't exist.]
      • Max Bounces    [Parameter doesn't exist.]
      • Light Linking    [No Plans.]
      • Light Filters    [No Plans.]

    • Spot Light

      • Aspect Ratio    [Parameter doesn't exist.]
      • Lens Radius    [Parameter doesn't exist.]

    • Skydome Light

      • Resolution    [Parameter doesn't exist.]
      • Format    [Parameter doesn't exist.]
      • Portal Mode    [Parameter doesn't exist.]
      • Shadow Color    [Parameter doesn't exist.]
      • AOV Indirect    [Parameter doesn't exist.]

• Arnold

  • Working

    • Light Types

      • Point Light
      • Directional Light
      • Spot Light
      • Quad Light
      • Disk Light
      • Cylinder Light
      • Skydome Light

  • Not Working

    • Light Types

      • Photometric Light    [Consider Future Release.]
      • Light Portal    [Consider Future Release.]
      • Physical Sun and Sky    [Consider Future Release.]
      • Mesh Light    [No Plans.]

    • Spot Light

      • Dropoff    [Parameter doesn't exist.]