Component:VolumeUnlitMaterial

Component image 

Volume Unlit Material component as seen in the Scene Inspector

The VolumeUnlitMaterial component is used to display 3d textures like Xrays, sunbeams, MRIs, CT scans, or any other 3d texture in a volumetric 3d cube that can optionally be sliced. Can also be used for volumetric lighting, but high texture resolutions can be large and cause considerable render lag.

This is a raymarched material, which means that a ray is stepped iteratively closer and closer to the volume in order to determine what is shown or not.

Fields

Fields

Name	Type	Description
persistent	Bool	Determines whether or not this item will be saved to the server.
UpdateOrder	Int	Controls the order in which this component is updated.
Enabled	Bool	Controls whether or not this component is enabled. Some components stop their functionality when this field is disabled, but some don't.
HighPriorityIntegration	Bool	If true, integrating this asset (e.g. processing procedural assets) gets higher priority than assets with this flag off. An example is user laser procedural meshes.
_shader	Shader	Internal.
Mode	DisplayMode	How to display the texture in 3D space.
BlendMode	BlendMode	How to blend this material's colors vs what it rendered on top of.
RenderQueue	Int	changes at which point a material renders on the render stack
Volume	Texture3D	The 3D texture this material should display.
StepSize	Float	How many cell details there should be.
Gain	Float	How much to gain up the color.
Exp	Float	What exponent to raise colors to.
AccumulationCutoff	Float	if color goes beyond this brightness, don't render it.
HitThreshold	Float	tells what value to consider a hit. Any value above this is drawn, and any other value below this is culled.
InputRange	Float	What range duration within 0<->1 do the colors in the 3d image have? Useful for isolating particular ranges for densities in a CT scan.
InputOffset	Float	at what point does the range start?
UseAlphaChannel	Bool	Whether to use the alpha channel in the pixel data of Volume.
Slices	list of SlicePlane	Slice planes that cut the volume along local positions and directions.
Highlights	list of Highlight	A list of planes with offsets which define a region of the volume to override the color of.

Usage

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DisplayMode

Values

Name	Value	Description
Additive	0	is an "add up over all of the times the ray has intersected the volume" statement.
AdditiveCutoff	1	is an "add up over all of the times the ray has intersected the volume" statement. Respects alpha cutoff.
HitThreshold	2	a binary "has the ray hit the volume or not?".

SlicePlane

Fields

Name	Type	Description
Normal	Float3	The normal direction of the slice in local space.
Offset	Float	The position of the slice in local space.

Highlight

Fields

Name	Type	Description
Normal	Float3	the normal of the plane which defines its orientation in local space.
Offset	Float	How far from the center of the volume to offset the plane in the inverse of its normal direction. (For some reason it is the negative of the normal) This is done in local space.
Range	Float	The "thickness" of the color to add to the volume. This is done on both sides of the plane evenly.
Color	ColorX	The color to override with.

Examples

• Khawn2u's RTX world with sunbeams.
• displays for imported 3D textures

• 
  This is an originally entirely white volume with a highlight plane which has a normal of <0,1,0>, with no offset, making it centered in the volume. Its range is 0.05 which gives it that thickness. If it was 0.5 this would fill the entire cube, since the volume is size <1,1,1> and this thickness is applied in both directions.
• 
  In the one on the right the threshold is 0.34, however the red part of the volume has a value of exactly 1/3, meaning that this gets culled, whereas the one on the left the threshold is 0.28 and the red streak passes the hit test and is drawn.