Do not draw touch sensor grid if contact point vis flag is disabled.

PiperOrigin-RevId: 781908115
Change-Id: Id42206b1d8b6766352071e20150e2a4047895bf7

Author: quagla

plugin/sensor/touch_stress.cc

@@ -407,6 +407,9 @@ static const mjtNum kRelativeThickness = 0.02;
 
 void TouchStress::Visualize(const mjModel* m, mjData* d, const mjvOption* opt,
                              mjvScene* scn, int instance) {
+  if (!opt->flags[mjVIS_CONTACTPOINT]) {
+    return;
+  }
   mj_markStack(d);
 
   // Get sensor data.