credit

assets/shader/skin_chooser.gdshader

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+shader_type spatial;
+
+uniform sampler2DArray skins : source_color, filter_linear_mipmap, repeat_enable;
+instance uniform int skin_index = 0;
+
+void fragment() {
+    vec4 tex_color = texture(skins, vec3(UV, float(skin_index)));
+    ALBEDO = tex_color.rgb;
+	// optional if alpha 
+    // ALPHA = tex_color.a;
+}