Godot Flow Map Shader

Handy shader for visualizing vector fields and flow maps.

This is intended more for debug purposes.

Note

ORIGINAL SHADER by Gehtsiegarnixan https://www.shadertoy.com/view/dssyzf

MODIFIED by KeyboardMoss for Godot 4

Usage Details

Shader input is a regular texture which is updated at regular intervals as needed.

• Each pixel represents a single vector and is scaled to match the plane surface.
• Red and Green channels store normalized vector directions, centered at <0.5,0.5> and length 0.5.
• Blue channel stores amplitude 0.0 to 1.0
• RGBA8 is sufficient but suffers from some precision silliness(+/-5deg). Use higher channel precision if exact directions are needed.
• Includes toggle to render only arrows.

Demo

Project contains a simple vector field to shader flow. The script can be easily modified to move around the world and display a limited window into a much larger vector field.