Procedural Volume Image Component
The procedural volume image component defines a box shaped volume in which the rules of ProcGen graphs are modified. Not every graph has to make use of this information, and what the exact effect is, is up to the ProcGen graph.
For more details see the chapter on ProcGen graph modifier nodes.
In contrast to the procedural volume box component, this component additionally samples an ImageData asset, such that it can provide fine grained information for every location within the box. This can be utilized to, for example, use a mask of the terrain that defines where roads are, where which type of plant shall grow and so on, to describe precisely how the procedural placement shall look like.
The image below shows an image volume used to only place the vegetation on the darker terrain patches.
Component Properties
Value: A single number value. This is combined with the InputValue from the modifier node in the graph, using theBlendModeformula.SortOrder: If multiple modifier volumes overlap, theSortOrdercan be used to control in which order the volumes are evaluated.BlendMode: How to combineValuewith the InputValue from the modifier node in the graph. The Set mode just sets the result toValueand ignores the other operand.Extents: The size of the box volume in which the modifier is active.FadeOutStart: The influence of the volume can fade out towards its edges, for smooth transitions. This value controls for every axis, at what distance from the center point the fade out starts. So if this is set to zero, the fade out starts immediately at the middle (towards the closest edge), whereas if it is set to one, there will be no fade out, at all, and rather the influence of the volume stops abruptly at its border.Image: The ImageData asset that is used as the reference data.