From c3c9ed2975b03b87a64f469d24bf5a5856289457 Mon Sep 17 00:00:00 2001 From: Dion Moult Date: Thu, 21 Apr 2022 09:58:28 +1000 Subject: [PATCH] #2150 Document how to manually reconcile large coordinate ranges --- .../docs/blenderbim/georeferencing.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/src/blenderbim/docs/blenderbim/georeferencing.rst b/src/blenderbim/docs/blenderbim/georeferencing.rst index 35843c2c9e..dfdd347a48 100644 --- a/src/blenderbim/docs/blenderbim/georeferencing.rst +++ b/src/blenderbim/docs/blenderbim/georeferencing.rst @@ -50,6 +50,25 @@ applications combine both of these invalid workarounds. To see which workaround was used on an object, check the "Blender Offset" property in the ``Transform`` object panel. +Sometimes, a model shifts their coordinates for some objects, but not all. For +example, the walls in a model may have their object placement or cartesian +points shifted to map coordinates, however, the object placement of the site is +still at 0, 0, 0. This creates a problem, because either we can display the +walls accurately, or the site placement accurately, but not both. Users may not +even realise this is an issue because many IFC viewers don't show object +placements because they are "invisible". However, because the BlenderBIM Add-on +is a full authoring platform, we do need to show these placements and thus it is +the users responsibility to reconcile this inconsistency in their coordinates. +Either the user needs to fix their file to consistently offset all coordinates, +or the user needs to manually tell the BlenderBIM Add-on which offset to choose. +In the absence of manual intervention, the BlenderBIM Add-on will make an +intelligent guess, but it may be wrong. + +To manually specify an offset, simply load an IFC project with Advanced Mode +enabled. Then enable the ``Import and Offset Model`` option and specify a new +coordinate to replace the origin's default of 0,0,0 in the ``Model Offset +Coordinates`` option. + Coordinates and precision limits --------------------------------