save code

GPUTrail-main/shaders/custom_example_alpha_erosion.gdshader

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+shader_type spatial;
+
+#define GPU_TRAIL
+#include "res://addons/GPUTrail/shaders/gputrail_lib.gdshaderinc"
+
+varying vec2 trail_uv;
+void vertex(){
+	PREPARE_TRAIL();
+
+	// Save the trail UV coordaintes for later
+	trail_uv = UV;
+
+	// Scroll textures slowly along the length of the trail
+	//UV.x -= fract(TIME*.4);
+}
+
+void fragment(){
+	PREPARE_TRAIL_TEXTURES();
+
+	// Alpha erosion
+	ALPHA = max(ALPHA - trail_uv.x, 0.0);
+}