first run MetricCellsGrid OK!

ShaderLibrary/Std3D/MetricCellsGrid.mtl

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+#Material
+Name MetricCellsGrid
+Base Std3D
+Reference https://www.shadertoy.com/view/wdSXzm
+
+#VertexInput
+vec2 TexCoord
+
+#MaterialInstance
+Length 120
+Stage  Fragment
+Code
+{
+    vec4 x_color;
+    vec4 y_color;
+    vec4 x_axis_color;
+    vec4 y_axis_color;
+    vec4 center_color;
+
+    vec2 lum;               //x=0.1 sub cell line,y=0.2 big cell line
+    vec2 cell_step;
+    vec2 big_cell_step;
+    vec2 scale;
+
+    float axis_line_width;
+    float center_radius;
+}
+
+#Vertex
+Output
+{
+    vec2 TexCoord
+}
+Code
+{
+    void main()
+    {
+        HandoverMI();
+
+        Output.TexCoord=TexCoord;
+
+        gl_Position=GetPosition3D();
+    }
+}
+
+#Fragment
+Output
+{
+    vec4 FragColor;
+}
+
+Code
+{
+    void main()
+    {
+        MaterialInstance mi=GetMI();
+
+        float edge=viewport.inv_viewport_resolution.y;
+
+        float x=(Input.TexCoord.x-0.5)*mi.scale.x;
+        float y=(Input.TexCoord.y-0.5)*mi.scale.y;
+
+        vec4 color=vec4(0,0,0,1);
+
+        // ======= Lines + Bold lines
+        color.xyz += step(1.0 - 1.0 / mi.cell_step.x,       fract(x / mi.cell_step.x    )) * mi.x_color.rgb * mi.lum.x;
+        color.xyz += step(1.0 - 1.0 / mi.big_cell_step.x,   fract(x / mi.big_cell_step.x)) * mi.x_color.rgb * mi.lum.y;
+
+        color.xyz += step(1.0 - 1.0 / mi.cell_step.y,       fract(y / mi.cell_step.y    )) * mi.y_color.rgb * mi.lum.x;
+        color.xyz += step(1.0 - 1.0 / mi.big_cell_step.y,   fract(y / mi.big_cell_step.y)) * mi.y_color.rgb * mi.lum.y;
+
+        // ======= AXES
+        float xb = step(abs(x) - mi.axis_line_width, 0.0);
+        float yb = step(abs(y) - mi.axis_line_width, 0.0);
+        color.rgb = mix(color.rgb, mi.x_axis_color.rgb, (xb));
+        color.rgb = mix(color.rgb, mi.y_axis_color.rgb, (yb));
+
+        // ======= CENTER
+        float cb = length(vec2(x,y))-mi.center_radius;
+        color.rgb = mix(color.rgb, mi.center_color.rgb, cb>0.0?0.0:smoothstep(0,edge*256.0,abs(cb)));
+
+        FragColor=color;
+    }
+}