Add lighting on walls, imperfect

shader/lightmapWall.frag

@@ -0,0 +1,13 @@
+#version 430 core
+in vec2 cenPosT;
+in float lum;
+
+in vec3 dField;
+
+out vec4 fColor;
+
+void main()
+{
+  float c = pow (1 - min(1, dot(dField,dField)) , 2) * lum ;
+  fColor = vec4(c,c,c,c);
+}