Corrected colourmap coord calculation for leveled heightmap

resources/shaders/heightmap0.vert

@@ -33,11 +33,17 @@ uniform int highlightingEnabled; //NEW
 uniform vec2 highlightingPoint; //NEW
 uniform float highlightingRadius; //NEW
 
+//Leveling related uniforms
+uniform mat4 modelSpaceRot;
+uniform float originZ;
+
 void main(){
 	vec3 position = aPos;
   vec4 position_transformed = model * vec4(position, 1.0);
 	gl_Position = projection * view * position_transformed;
-	colorCoord = (aPos.z - minZ)/(maxZ-minZ);
+	//colorCoord = (aPos.z - minZ)/(maxZ-minZ);
+  vec4 pos_col = modelSpaceRot * (vec4(aPos, 1.) + vec4(0.0,0.0,-originZ,0.0)) + vec4(0.0,0.0,originZ,0.0);
+  colorCoord = (pos_col.z - minZ)/(maxZ-minZ);
 	vertexColor = vec4(position.z, 0.0, 0.0, 1.);
   colorOverridden = 0;