Also add the new meta-data to the output when using the conversio functions.

src/cooling/none/cooling_io.h

@@ -62,9 +62,9 @@ __attribute__((always_inline)) INLINE static int cooling_write_particles(
     const struct part* parts, const struct xpart* xparts, struct io_props* list,
     const struct cooling_function_data* cooling) {
 
-  list[0] = io_make_output_field_convert_part("Temperature", FLOAT, 1,
-                                              UNIT_CONV_TEMPERATURE, parts,
-                                              xparts, convert_part_T);
+  list[0] = io_make_output_field_convert_part(
+      "Temperature", FLOAT, 1, UNIT_CONV_TEMPERATURE, 0.f, parts, xparts,
+      convert_part_T, "Temperature of the particles");
   return 1;
 }
 

src/gravity/Default/gravity_io.h

@@ -108,9 +108,11 @@ INLINE static void darkmatter_write_particles(const struct gpart* gparts,
 
   /* List what we want to write */
   list[0] = io_make_output_field_convert_gpart(
-      "Coordinates", DOUBLE, 3, UNIT_CONV_LENGTH, gparts, convert_gpart_pos);
+      "Coordinates", DOUBLE, 3, UNIT_CONV_LENGTH, 1.f, gparts,
+      convert_gpart_pos, "Position of the particles");
   list[1] = io_make_output_field_convert_gpart(
-      "Velocities", FLOAT, 3, UNIT_CONV_SPEED, gparts, convert_gpart_vel);
+      "Velocities", FLOAT, 3, UNIT_CONV_SPEED, 0.f, gparts, convert_gpart_vel,
+      "Peculiar velocites of the particles");
   list[2] = io_make_output_field("Masses", FLOAT, 1, UNIT_CONV_MASS, 0.f,
                                  gparts, mass, "");
   list[3] =

src/hydro/Minimal/hydro_io.h

@@ -160,11 +160,12 @@ INLINE static void hydro_write_particles(const struct part* parts,
   *num_fields = 10;
 
   /* List what we want to write */
-  list[0] = io_make_output_field_convert_part("Coordinates", DOUBLE, 3,
-                                              UNIT_CONV_LENGTH, parts, xparts,
-                                              convert_part_pos);
+  list[0] = io_make_output_field_convert_part(
+      "Coordinates", DOUBLE, 3, UNIT_CONV_LENGTH, 1.f, parts, xparts,
+      convert_part_pos, "Co-moving position of the particles");
   list[1] = io_make_output_field_convert_part(
-      "Velocities", FLOAT, 3, UNIT_CONV_SPEED, parts, xparts, convert_part_vel);
+      "Velocities", FLOAT, 3, UNIT_CONV_SPEED, 0.f, parts, xparts,
+      convert_part_vel, "Peculiar velocites of the particles");
   list[2] = io_make_output_field("Masses", FLOAT, 1, UNIT_CONV_MASS, 0.f, parts,
                                  mass, "Masses of the particles");
   list[3] = io_make_output_field(
@@ -179,15 +180,16 @@ INLINE static void hydro_write_particles(const struct part* parts,
   list[6] =
       io_make_output_field("Density", FLOAT, 1, UNIT_CONV_DENSITY, -3.f, parts,
                            rho, "Physical mass density of the particles");
-  list[7] = io_make_output_field_convert_part("Entropy", FLOAT, 1,
-                                              UNIT_CONV_ENTROPY_PER_UNIT_MASS,
-                                              parts, xparts, convert_S);
+  list[7] = io_make_output_field_convert_part(
+      "Entropy", FLOAT, 1, UNIT_CONV_ENTROPY_PER_UNIT_MASS, 0.f, parts, xparts,
+      convert_S, "Entropy per unit mass of the particles");
   list[8] = io_make_output_field_convert_part(
-      "Pressure", FLOAT, 1, UNIT_CONV_PRESSURE, parts, xparts, convert_P);
+      "Pressure", FLOAT, 1, UNIT_CONV_PRESSURE, 3 * hydro_gamma, parts, xparts,
+      convert_P, "Pressure of the particles");
 
-  list[9] = io_make_output_field_convert_part("Potential", FLOAT, 1,
-                                              UNIT_CONV_POTENTIAL, parts,
-                                              xparts, convert_part_potential);
+  list[9] = io_make_output_field_convert_part(
+      "Potential", FLOAT, 1, UNIT_CONV_POTENTIAL, 1.f, parts, xparts,
+      convert_part_potential, "Gravitational potential of the particles");
 }
 
 /**

src/stars/Default/stars_io.h

@@ -66,7 +66,7 @@ INLINE static void stars_write_particles(const struct spart *sparts,
   /* List what we want to write */
   list[0] = io_make_output_field("Coordinates", DOUBLE, 3, UNIT_CONV_LENGTH,
                                  1.f, sparts, x, "");
-  list[1] = io_make_output_field("Velocities", FLOAT, 3, UNIT_CONV_SPEED, 1.f,
+  list[1] = io_make_output_field("Velocities", FLOAT, 3, UNIT_CONV_SPEED, 0.f,
                                  sparts, v, "");
   list[2] = io_make_output_field("Masses", FLOAT, 1, UNIT_CONV_MASS, 0.f,
                                  sparts, mass, "");

src/velociraptor_io.h

@@ -61,8 +61,9 @@ __attribute__((always_inline)) INLINE static int velociraptor_write_parts(
     struct io_props* list) {
 
   list[0] = io_make_output_field_convert_part(
-      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, parts, xparts,
-      velociraptor_convert_part_groupID);
+      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, 0.f, parts, xparts,
+      velociraptor_convert_part_groupID,
+      "Group ID of the particle in the VELOCIraptor catalogue");
 
   return 1;
 }
@@ -70,8 +71,9 @@ __attribute__((always_inline)) INLINE static int velociraptor_write_parts(
 __attribute__((always_inline)) INLINE static int velociraptor_write_gparts(
     const struct velociraptor_gpart_data* group_data, struct io_props* list) {
 
-  list[0] = io_make_output_field("GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS,
-                                 0.f, group_data, groupID, "");
+  list[0] = io_make_output_field(
+      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, 0.f, group_data, groupID,
+      "Group ID of the particle in the VELOCIraptor catalogue");
 
   return 1;
 }
@@ -80,8 +82,9 @@ __attribute__((always_inline)) INLINE static int velociraptor_write_sparts(
     const struct spart* sparts, struct io_props* list) {
 
   list[0] = io_make_output_field_convert_spart(
-      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, sparts,
-      velociraptor_convert_spart_groupID);
+      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, 0.f, sparts,
+      velociraptor_convert_spart_groupID,
+      "Group ID of the particle in the VELOCIraptor catalogue");
 
   return 1;
 }
@@ -90,8 +93,9 @@ __attribute__((always_inline)) INLINE static int velociraptor_write_bparts(
     const struct bpart* bparts, struct io_props* list) {
 
   list[0] = io_make_output_field_convert_bpart(
-      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, bparts,
-      velociraptor_convert_bpart_groupID);
+      "GroupID", LONGLONG, 1, UNIT_CONV_NO_UNITS, 0.f, bparts,
+      velociraptor_convert_bpart_groupID,
+      "Group ID of the particle in the VELOCIraptor catalogue");
 
   return 1;
 }