Laser

Shaders/minimal_laser.gdshader

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+shader_type spatial;
+render_mode unshaded, blend_add, cull_disabled, depth_draw_opaque;
+
+uniform vec3 beam_color : source_color = vec3(1.0, 0.2, 0.2);
+uniform float glow_radius = 0.2; // fraction of cylinder radius
+uniform float noise_speed = 1.0;
+uniform float flicker_strength = 0.2;
+
+void fragment() {
+    // Compute distance from center axis
+    // Cylinder UV: Y goes along height, X around circumference
+    float d = length(UV - vec2(0.5, 0.0)); // UV.x = around circumference, UV.y along height
+
+    // Glow: smooth edge
+    float alpha = smoothstep(0.5, 0.5 - glow_radius, d);
+
+    // Optional flicker along the beam (animated by Y)
+    float flicker = sin(UV.y * 20.0 + TIME * noise_speed) * flicker_strength;
+    alpha = clamp(alpha + flicker, 0.0, 1.0);
+
+    ALBEDO = beam_color;
+    ALPHA = alpha;
+}

Shaders/minimal_laser.gdshader.uid

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+uid://cd8n7vsgxkfib