ProWalker GPU contains a lighting dialog that allows users to tweak global light/exposure and make quick adjustments to the tonemapping of the render.

Access the lighting dialog from the lightbulb icon in the ProWalker GPU toolbar. You'll see two sets of parameters: three sliders to adjust light intensity, and two more that pertain to tonemapping and color space. Additionally, there is a function at the top of the dialog for creating lighting presets.

Light intensity:

Physical - Contols the brightness and intensity of natural light from the physical sun/sky system. Most of the time, this will be your primary mechanism for adjusting the overall level of illuminatiion or exposure in your render/animation.

When using HDRI mode instead of a sky simulation, the "physical" light slider controls the intensity of the light emitted from the HDRI image.

Artificial: - This is a global control for the brightness of artificial lights in your scene, including both omni and spot lights. The artificial slider acts as a universal multiplier for all artificial lights in your scene—the individual strength of each light fixture can still be adjusted from the Podium light system dialog.

The artificial light slider has no effect on light emitting LEM materials. LEM Power must be adjusted on a material-by-material basis in the materials dialog.

Ambient - The ambient slider is only relevant when using the QCK (quick) render mode, which employs screen-space ambient occlusion instead of raytraced global illumination. Moving the ambient slider will brighten/darken areas in your render that are currently in shadow.


The Tone Map sliders provide another mechanism to control exposure by adjusting the value range and color space of your render.

Brightness: This is an illumination adjustment applied linearly to all pixels in your image to lighten or darken the render. Generally, we recommend you use the "physical" slider to get your illumination as close as possible to the desired result before touching the brightness slider.

Gamma: In ProWalker GPU, the gamma slider works similarly to a contrast adjustment in Podium Image Editor. Lowering the Gamma value will appear to increase contract, darkening shadows and brightening highlights. Increasing the gamma slider beyond 2.2 has the opposite effect, compressing the value range and decreasing contrast.

Lighting Presets

Lighting presets can be created and saved from the input box at the top of the lighting dialog.

Once you've adjusted the values in the Intensity and Tone Map sliders to your liking, simply type a name into the preset line and click the Save (disk) icon to the right.

Presets are accessible from the dropdown menu and carry over between SketchUp models.

To delete a preset, select it from the preset drop-down, click the "X" icon, and then "OK".