feat: added height line shader

project/assets/shaders/height_lines.gdshader

@@ -0,0 +1,24 @@
+shader_type spatial;
+render_mode unshaded, skip_vertex_transform;
+
+uniform float height_step = 10;
+uniform float line_thickness = 0.1;
+uniform vec4 lines : source_color;
+
+varying vec3 var_vertex_position;
+varying vec3 var_model_normal;
+
+void vertex() {
+	var_model_normal = normalize(NORMAL);
+	var_vertex_position = (vec4(VERTEX, 1.0) * MODEL_MATRIX).xyz;
+	VERTEX = (MODELVIEW_MATRIX * vec4(VERTEX, 1.0)).xyz;
+	NORMAL = normalize(MODELVIEW_MATRIX * vec4(NORMAL, 0.0)).xyz;
+	TANGENT = normalize(MODELVIEW_MATRIX * vec4(TANGENT, 0.0)).xyz;
+	BINORMAL = normalize(MODELVIEW_MATRIX * vec4(BINORMAL, 0.0)).xyz;
+}
+
+void fragment() {
+	ALBEDO = lines.rgb;
+	ALPHA = int(var_vertex_position.y / line_thickness / height_step) % int(2.0 / line_thickness) == 0 ? lines.a : 0.0;
+	ALPHA = var_model_normal.y > 0.99 ? 0.0 : ALPHA;
+}

project/assets/shaders/height_lines.gdshader.uid

@@ -0,0 +1 @@
+uid://cf5jptb8gp4u7