ProWalker CPU includes an option to use HDRI backgrounds to drive image based lighting instead of the SketchUp sun/shadow system.

Image based lighting is an easy way to add realistic reflections and subtle, natural tonemapping to your render. HDRI lighting also enables users to test a variety of lighting conditions and tonal variations simply and easily.

Check the "HDRI" radio button in the Background Settings dialog to activate HDRI lighting.

Five HDRI backgrounds are installed automatically with ProWalker CPU, which can be accessed from the dropdown menu in the Background Settings dialog. ProWalker CPU users are also entitled to over 40 additional HDRI images, which can be downloaded here

  Preview the five included HDRI backgrounds here.

Offset Offset allows you to dynamically rotate the HDRI/ IBL background image within ProWalker.

How to install additional HDRI files

To install additional HDRI backgrounds for rendering in ProWalker, simply place them into the appropriate folder on Windows:

C:\Users\Username\AppData\Roaming\SketchUp\SketchUp 20xx\SketchUp\Plugins\ProWalker\PWApp\Backgrounds

On the Mac, open the PWApp package to see the Backgrounds folder.

Any .HDR file copied into the backgrounds folder will automatically show up in the dropdown menu as pictured right:

Note: AppData is often hidden by default. Read here if you don't know how to view hidden folders.

These three images demonstrate how easy it is to alter the shadow quality, reflections, and tonality of your render simply by choosing a different HDRI background.

Where to find additional HDR Files:

Licensed ProWalker CPU users are entitled to 40 additional high-resolution HDR backgrounds from HDRI These can be downloaded from the below page—please have your license ready to log-in. These HDRI backgrounds are also available in SU Podium V2.6's Podium Browser.

  ProWalker CPU - HDRI Library

HDRI offers a large collection of commercial HDRI backgrounds. Free with limited resolution, and paid commercial packages at higher resolutions if needed. This is the best option we know of for natural sky/background images with few man-made objects in the scenes.

Other HDRI sources:

  • sIBL Archive - Smaller library of free HDRI sets for image based lighting with a variety of styles & settings.
  • Dosch Design HDRI - High quality premium HDRI sets; mostly paid content.
  • Peter Gutherie Skies - 360° panoramic high dynamic range (HDR) maps for use in all types of rendering. Paid content.
  • HDRI Hub - HDRI aggregator site that links out to a wide variety for both free and paid sky and background options.
  • HDRI Haven- One of the most active, free HDRI backgrounds web sites. There are hundreds of HDRI/ IBL backgrounds using variety of environments including Sky, City, Ocean, etc.

A note about Image Based Lighting (IBL):

When using ProWalker in Texture (HDRI) mode, the HDRI image becomes the primary form of lighting in your renders. The disadvantage here is that you no longer have exact control over where you shadows will fall, the advantage is that lighting, brightness, and shadow angle in your scene will always precisely match your background image. You can also control the amount of exposure by using the Light Intensity, Physical slider.

With ProWalker CPU, you can dynamically rotate the HDRI background in the rendered ProWalker scene. Please read about it here.