road-rage-tank/player/hp_outline.gdshader

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shader_type canvas_item;
void fragment() {
float dist_from_edge_x = .5 - abs(UV.x - .5);
float dist_from_edge_y = .5 - abs(UV.y - .5);
// dist_from_edge in pixels
float dfe_xpx = dist_from_edge_x * 100.;
float dfe_ypx = dist_from_edge_y * 40.;
float dfe_px = min(dfe_xpx, dfe_ypx);
COLOR.a *= dfe_px < 7.5 ? 1. : 0.;
}