+}
+
+bool
+FGInterface::prepare_ground_cache_m(double ref_time, const double pt[3],
+ double rad)
+{
+ return ground_cache.prepare_ground_cache(ref_time, pt, rad);
+}
+
+bool FGInterface::prepare_ground_cache_ft(double ref_time, const double pt[3],
+ double rad)
+{
+ // Convert units and do the real work.
+ sgdVec3 pt_ft;
+ sgdScaleVec3( pt_ft, pt, SG_FEET_TO_METER );
+ return ground_cache.prepare_ground_cache(ref_time, pt_ft, rad*SG_FEET_TO_METER);
+}
+
+bool
+FGInterface::is_valid_m(double *ref_time, double pt[3], double *rad)
+{
+ return ground_cache.is_valid(ref_time, pt, rad);
+}
+
+bool FGInterface::is_valid_ft(double *ref_time, double pt[3], double *rad)
+{
+ // Convert units and do the real work.
+ bool found_ground = ground_cache.is_valid(ref_time, pt, rad);
+ sgdScaleVec3(pt, SG_METER_TO_FEET);
+ *rad *= SG_METER_TO_FEET;
+ return found_ground;
+}
+
+double
+FGInterface::get_cat_m(double t, const double pt[3],
+ double end[2][3], double vel[2][3])
+{
+ return ground_cache.get_cat(t, pt, end, vel);
+}
+
+double
+FGInterface::get_cat_ft(double t, const double pt[3],
+ double end[2][3], double vel[2][3])
+{
+ // Convert units and do the real work.
+ sgdVec3 pt_m;
+ sgdScaleVec3( pt_m, pt, SG_FEET_TO_METER );
+ double dist = ground_cache.get_cat(t, pt_m, end, vel);
+ for (int k=0; k<2; ++k) {
+ sgdScaleVec3( end[k], SG_METER_TO_FEET );
+ sgdScaleVec3( vel[k], SG_METER_TO_FEET );
+ }
+ return dist*SG_METER_TO_FEET;
+}
+
+bool
+FGInterface::get_agl_m(double t, const double pt[3],
+ double contact[3], double normal[3], double vel[3],
+ int *type, double *loadCapacity,
+ double *frictionFactor, double *agl)
+{
+ return ground_cache.get_agl(t, pt, contact, normal, vel, type,
+ loadCapacity, frictionFactor, agl);
+}