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Voxel Probe is a light source which provides static voxel lighting and shading on an object inside the probe by using a prebaked 3D lighting map. Unlike Environment Probe, Voxel Probe provides physically accurate light spreading inside interiors and outdoor static scenes but supports diffuse reflections only.
Also, Voxel Probe is great solution for shading dynamic objects within static areas.
Voxel Probe provides box volume composed of voxels and contains parameters used for light baking inside it.
Voxel Probe projects a 3D lighting texture on objects inside it thus providing indirect lighting simulation.
Resolution = Width × Height × (Depth × 6)
Each pixel of a texture defines the illuminance of a certain voxel face.
The inner space of Voxel Probe is visualized using spheres. These spheres are used to show the illumination in each voxel from all directions. The visualizer is enabled by default. To adjust or disable it, use the Helpers menu in Editor Viewport:
Voxel Probe Visualizer settings:
- Grid Size — number of spheres in every row/column, the value from 7 to 40.
- Sphere Scale — size of the visualizing sphere.
Voxel Probe is a required object for the Voxel-Based GI feature, which enables you to generate a lighting texture for the probe and simulate global illumination with indirect lighting for both, interiors and outdoor scenes.
Adding Voxel Probe#
To add a Voxel Probe object to the scene via UnigineEditor, do the following:
- On the Menu bar, click Create -> Light -> Voxel Probe.
- Place the probe somewhere in the world.
- Bake Lighting or set the Texture parameter by choosing a prebaked lighting texture from assets.
Voxel Probe Settings#
Parameters of the voxel probe light are available in the Node tab of the Parameters window. It includes both the common and the specific parameters. A set of parameters specific for voxel probes is described below.
|Box Size||Specifies the size of the box volume.|
|Voxel Size||Sets the size of a voxel.
If the Box Size is not divisible to the Voxel Size without remainder, the voxel probe uses the lowest volume of voxels covering the box.
|Additive Blending||Enables the additive blending mode for the voxel probe. This option offers more flexibility in lighting control. You can use it to blend lighting of several voxel probes together and control them separately (e.g. make a separate voxel probe for an indoor emissive light source and blend it with another voxel probe with lighting baked from the sky, having the ability to enable and disable them separately).
Voxel probes with additive blending enabled cannot be used as insets to add lighting details (e.g. creating a small high-detail voxel probe inside a large low-detail one). Such probes do not replace each other, as they are blended instead.
|Use Sun Color||Enables the influence of sun light color on the voxel probe. When enabled, this option makes the voxel probe color black at night, or orange at sunset.
To bake lighting from the sky separately with this option enabled, it is recommended to enable baking visibility for the sky only, while disabling it for other light sources.
Changing this option requires the lighting to be re-baked.
|Bias||Sets the bias of ambient lighting by adjusting the voxels offset for fine tuning.|
|Cubic Filtering||Enables the cubic filtering of ambient lighting.
When disabled, the linear filtering is used.
|Enabled||Enables reflections for the Voxel Probe. By default Voxel Probes are used for lighting only, as for reflectons, it is recommended to simulate them using Environment Probes. This approach ensures the best result, however you can still enable reflections for a Voxel Probe via this option.|
|Visibility Roughness Min||Sets the lower bound of the roughness range within which the reflections of the voxel probe are visible.|
|Visibility Roughness Max||Sets the higher bound of the roughness range within which the reflections of the voxel probe are visible.
The roughness range helps to choose between diffuse reflection of the voxel probe and other ones (reflection from an environment probe, the environment cubemap) for all materials having the Roughness parameter.
|Bias||Sets the bias of reflection by adjusting the voxels offset for fine tuning.|
|Cubic Filtering||Enables the cubic filtering of reflection.
When disabled, the linear filtering is used.
|Baking Viewport Mask||Sets the baking viewport mask which specifies the surfaces to be baked basing on their material's Viewport Mask.|
|Far Clipping||Sets the distance to the far clipping plane used for every voxel during light baking.
An extremely big difference between the Near and Far Clipping Planes can cause baking the space into black. Therefore, if the required Far Clipping Plane value is outside the range, adjust the Near Clipping value proportionately.
|Bake Quality||Defines the baking quality preset for the voxel probe.
|Bake Internal Volume||Defines the mode of internal volume baking of Voxel Probe.
Having baked internal volume makes it possible to realistically shade dynamic objects that move inside the voxel probe as the lighting texture is projected onto all the geometry.
|Visibility Sky||Enables baking of lighting from the sky to the voxel probe.|
|Visibility Light World||Enables baking of world light sources to the voxel probe.|
|Visibility Light Omni||Enables baking of omni light sources to the voxel probe.|
|Visibility Light Proj||Enables baking of projected light sources to the voxel probe.|
|Visibility Voxel Probe||Enables baking of other voxel probe light sources to the voxel probe.|
|Visibility Environment Probe||Enables baking of environment probe light sources to the voxel probe.|
|Visibility Emission||Enables baking of emission light sources to the voxel probe.|
|Visibility Lightmap||Enables baking of lightmapped surfaces to the voxel probe.|
|Texture||Sets the 3D lighting texture.
Every bake lighting procedure makes changes to the asset which is set for this parameter.
You can leave the field empty to avoid losing content. In this case a new generated lighting texture will be set for this parameter after the bake lighting procedure. Generated textures are stored in the data/bake_lighting folder.