Units: Support for fixed units

Users can select the main unit they want to use now.
Previously the displayed unit always depended on the magnitude of the value.
The old behavior can be restored by switching to the "Adaptive" mode for length, mass and time units.

Meters, kilograms and seconds are the default units for new and old scenes.

The selected unit is also the default unit for user input.
E.g. if cm is selected, whenever the user inputs a unitless number into a field of type length, it will be interpreted as cm.

Reviewer: brecht

Differential: https://developer.blender.org/D3740

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_280.c b/source/blender/blenloader/intern/versioning_280.c
index c32cfa433bd..7d059d6f996 100644
--- a/source/blender/blenloader/intern/versioning_280.c
+++ b/source/blender/blenloader/intern/versioning_280.c
@@ -85,6 +85,7 @@
 #include "BKE_object.h"
 #include "BKE_cloth.h"
 #include "BKE_key.h"
+#include "BKE_unit.h"
 
 #include "BLT_translation.h"
 
@@ -2132,4 +2133,15 @@ void blo_do_versions_280(FileData *fd, Library *UNUSED(lib), Main *bmain)
 			}
 		}
 	}
+
+	if (!MAIN_VERSION_ATLEAST(bmain, 280, 25)) {
+		for (Scene *scene = bmain->scene.first; scene; scene = scene->id.next) {
+			UnitSettings *unit = &scene->unit;
+			if (unit->system != USER_UNIT_NONE) {
+				unit->length_unit = bUnit_GetBaseUnitOfType(scene->unit.system, B_UNIT_LENGTH);
+				unit->mass_unit = bUnit_GetBaseUnitOfType(scene->unit.system, B_UNIT_MASS);
+			}
+			unit->time_unit = bUnit_GetBaseUnitOfType(USER_UNIT_NONE, B_UNIT_TIME);
+		}
+	}
 }