CPUParticles2D - CanvasShader - INSTANCE_CUSTOM.x - is it broken?

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By vtepe

Ubuntu 18.04 x64, Godot 3.2.1.

Trying to have some custom lighting on CPUParticles2D. Trying to rotate the LIGHT_VEC using INSTANCE_CUSTOM.x but it seems to have no effect.

varying flat float rotation;

rotation = INSTANCE_CUSTOM.x; // in vertex func

// light func
float sn = sin(rotation);
float cs = cos(rotation);
LIGHT_VEC = vec2(cs * LIGHT_VEC.x - sn * LIGHT_VEC.y, sn * LIGHT_VEC.x + cs * LIGHT_VEC.y);

This doesn’t work for me, particles look lit from random angles. How to get particle rotation in the shader?

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