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Overview

Watervolumes and rivers support a unified caustics approach. These caustics capture 1:1 caustics of the water surface (when tilling and intensity are set to 1, see below). This includes water ripples generated from objects interacting with the water surface.

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Make sure your Watervolume is at a world height of '1' or greater. If it's below '1' Z height in the level then the caustics will not display.

Caustics Settings

The water volume and river entities have been extended to allow these controls over the caustics (all settings per-entity):

Parameter

Description

Caustics

Enables Caustics for this entity.

Intensity

Intensity of normals during caustics generation.

Tiling

Tilling of normals during caustics generation.

Height

Height above water surface caustics are visible.

Intensity

Controls the intensity of the caustics (this scales the normals of the surface when rendering to the caustic map, producing stronger caustics).

Intensity 1Intensity 4Intensity 8

Tiling

This is a multiplier for the tiling applied to the surface normals during caustic generation. It allows you to scale the caustics generation independently from the surface material in cases of strong tiled normals or vice-versa.

Tiling 1Tiling 4Tiling 8

Height

Controls the height above the water entity in which caustics can be cast. This can be used to cause caustics on overhangs and other nearby objects.

Height 1Height 3Height 6

Console Variables

CVar

Description

Values

r_WaterVolumeCaustics

Enables or disables caustics for water volumes

0 - 1 (default depends on system - currently 0 on all except PC high-spec).

r_WaterVolumeCausticsDensity

Sets the density of the grid mesh.

16 - 256 (default is 128 for lower specs, 256 for high specs).

r_WaterVolumeCausticsMaxDist

Sets the maximum view distance caustics are visible.

Anything. Default 25.

r_WaterVolumeCausticsRes

Sets the resolution of the caustics map/g-buffer.

Texture resolution. Default 1024 for high specs, 512 for low specs.

r_WaterCausticsSnapFactor

Sets the snap factor of the caustic render, helps prevent aliasing during motion.

Anything. Default: 0.1.

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