Post-processing refers to a multitude of effects that can be applied to an image immediately after it is rendered. In 3D graphics, post-processing is most often used to make images look more realistic. For example, the renderer might blur background objects to simulate how a camera lens focuses.
In TDW, post-processing is enabled in all scenes by default. You can disable post-processing with the command set_post_process. This will result in images that appear "flatter". It also sometimes improves simulation speed.
If post-processing is enabled but images appear flat, make sure that you're running TDW with a GPU.
Post-processing commands affect all cameras in the scene. If you load a new scene or reloading the current scene, you must re-send the post-processing commands.
These commands adjust global post-processing values in a scene. In nearly all cases, they should be sent only when a scene is first initialized.
| Command | Description | Default value |
|---|---|---|
set_ambient_occlusion_intensity |
Set the intensity (darkness) of the Ambient Occlusion effect. | 0.25 |
set_ambient_occlusion_thickness_modifier |
Set the Thickness Modifier for the Ambient Occlusion effect controls "spread" of the effect out from corners. | 1.25 |
set_contrast |
Set the contrast value of the post-processing color grading. | 20 |
set_post_exposure |
Set the post-exposure value of the post-processing. A higher value will create a brighter image. We don't recommend values less than 0, or greater than 2. | 0 |
set_saturation |
Set the saturation value of the post-processing color grading. | -20 |
set_screen_space_reflections |
Toggle screen space reflections. This is used to create reflections off of visual materials in the scene. | True |
set_vignette |
Enable or disable the vignette, which darkens the image at the edges. | False |
There are additional post-processing commands that are meant to be set dynamically while a simulation is running. The commands affect each camera that are currently in the scene and will be covered in the next document.
Next: Interior lighting (the InteriorSceneLighting add-on)
Example controllers:
- photoreal.py Create a photorealistic scene, focusing on post-processing and other effects.
- rotate_hdri_skybox.py Add an HDRI skybox to the scene and rotate it. This controller includes post-processing commands.
Command API: