Rheoscopic Fluid — 2D Flow + Anisotropic “Crystal Flake” Shading

Drag / click to stir. Shift+Drag adds dye without force. Double‑click to clear.

Simulation Time Scale 1.00 Viscosity 0.0015 Vorticity (curl) 4.0 Pressure iters 50

Resolution

Dye

Color

Inject rate 1.0 Diffusion 0.001 Decay 0.0

Rheoscopic Shading Light angle 0.50 rad Anisotropy 8.0 Contrast 1.4 Sheen (spec) 0.5 Edge Hilite 0.4

Base tint

Highlight tint

Dark tint

Velocity->Shading mix 0.85

Input Force 900 Radius 36 px Noise Kick 140

Hold Shift while dragging to inject dye without force. Double‑click to clear.

Idea: Treat mica flakes aligning to local flow direction. Shading = anisotropic BRDF driven by normalized velocity vector and its curl magnitude for edge sparkle.

Single‑file, WebGL2, float FBOs. Should run on modern desktop browsers.