RNA_def_property_boolean_sdna(prop, NULL, "draw_velocity", 0);
RNA_def_property_ui_text(prop, "Display Velocity", "Toggle visualization of the velocity field as needles");
RNA_def_property_update(prop, NC_OBJECT | ND_DRAW, NULL);
RNA_def_property_boolean_sdna(prop, NULL, "draw_velocity", 0);
RNA_def_property_ui_text(prop, "Display Velocity", "Toggle visualization of the velocity field as needles");
RNA_def_property_update(prop, NC_OBJECT | ND_DRAW, NULL);