Heightmap probing ... done?

render.h

@@ -3,6 +3,7 @@
 #include "grbl.h"
 #include "grbl_machine.h"
 #include "glm/ext/matrix_float4x4.hpp"
+#include "heightmap.h"
 #include <nanogui/opengl.h>
 
 namespace grbl {
@@ -18,7 +19,7 @@ public:
 
     glm::vec3 get_extents_max() const { return max_pos; };
 
-    void update_grid(float from_x, float from_y, float to_x, float to_y, int resolution);
+    void update_grid(const grbl::heightmap& grid);
 private:
     GLsizei update_model_vbo(const grbl::program& pgm);